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33 results about "Digital delay generator" patented technology
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A digital delay generator (also known as digital-to-time converter) is a piece of electronic test equipment that provides precise delays for triggering, syncing, delaying and gating events. These generators are used in many types of experiments, controls and processes where electronic timing of a single event or multiple events to a common timing reference is needed. The digital delay generator may initiate a sequence of events or be triggered by an event. What differentiates it from ordinary electronic timing is the synchronicity of its outputs to each other and to the initiating event.
Variable Tomographic Scanning with Wavelength Scanning Digital Interface Holography
ActiveUS20080137933A1Holographic light sources/light beam propertiesCharacter and pattern recognitionDigital interfaceTomography
A series of holograms is recorded by synchronizing a camera with laser pulses under the control of a digital delay generator. Amplitude and phase images are calculated while image distances are adjusted for the best focus on the object under observation. The amplitude and phase images are reconstructed while adjusting the image distances over a predetermined range to maintain the object in focus. Numerical superposition of a plurality of holographic fields taken with varying wavelengths provides high resolution microscopic three-dimensional imaging. Numerical reconstruction is based on an angular spectrum method that enables calculation of the image at any distance from the hologram plane. Wavelength scanning digital interference holography also enables image reconstruction along an arbitrarily tilted plane.
Owner:UNIV OF SOUTH FLORIDA
Laser probe micro-area component analyzer based on double laser light source
ActiveCN101782517AAchieve accuracyTo achieve the purpose of precise quantitative analysisAnalysis by material excitationMountingsFiberLaser probe
The invention belongs to the technical field of laser probing, in particular to a laser probe micro-area component analyzer based on a double laser light source. The laser probe micro-area component analyzer comprises a fixed wavelength laser device, an attenuator, a beam expanding mirror and an aperture diaphragm; first semi-permeable half-mirrors are arranged on the same horizontal light path according to the structure; after a wavelength tunable laser device is reflected onto the first semi-permeable half-mirrors by a second totally reflecting mirror, the wavelength tunable laser device has the same light path with the laser beam of the fixed wavelength laser device; the fixed wavelength laser device and the wavelength tunable laser device can be arranged up and down or in parallel, and the starting sequence and the time delay thereof can be controlled by a digital delay generator; a fibre-optical probe receives laser, then the laser is transmitted to a grating spectrometer by the optical fibre, and the acquisition time of a plasma spectra reaching enhancement mode CCD is controlled by the digital delay generator. The laser probe machine stimulated by the double laser light sources has low detection limit, high element analysis precision and favourable element selectivity, is reliable and safe, and can be used for accurately determining the nature of microelements and trace elements of the micro-areas of various substances as well as carrying out accurate quantitative analysis.
Owner:HUAZHONG UNIV OF SCI & TECH
Variable tomographic scanning with wavelength scanning digital interface holography
ActiveUS7486406B2Holographic light sources/light beam propertiesCharacter and pattern recognitionDigital interfaceTomography
A series of holograms is recorded by synchronizing a camera with laser pulses under the control of a digital delay generator. Amplitude and phase images are calculated while image distances are adjusted for the best focus on the object under observation. The amplitude and phase images are reconstructed while adjusting the image distances over a predetermined range to maintain the object in focus. Numerical superposition of a plurality of holographic fields taken with varying wavelengths provides high resolution microscopic three-dimensional imaging. Numerical reconstruction is based on an angular spectrum method that enables calculation of the image at any distance from the hologram plane. Wavelength scanning digital interference holography also enables image reconstruction along an arbitrarily tilted plane.
Owner:UNIV OF SOUTH FLORIDA
Quantitative phase-contrast and excitation-emission systems
InactiveUS20100231896A1Analysis by material excitationMicroscopesInterference phenomenonRefractive index
An optical system includes an optical interferometer that generates interference phenomena between optical waves to measure multiple distances, thicknesses, and indices of refraction of a sample. An excitation-emission device allows an electromagnetic excitation and emission to pass through an objective in optical communication with the sample. An electromagnetic detector receives the output of the optical interferometer and the excitation-emission device to render a magnified image of the sample. A digital delay generator synchronizes the optical interferometer and excitation-emission device to operate in substantially unison to generate a noninvasive depth of field of the portion of the sample that corrects a plurality of optical aberrations in real-time.
Owner:UT BATTELLE LLC
Cavity ring down aerosol extinction spectrometer
InactiveCN103616334AHigh precisionImprove time resolutionMaterial analysis by optical meansData acquisitionSpectrometer
The present invention relates to a cavity ring down aerosol extinction spectrometer, which comprises an optical path system, an electrical circuit system and a gas path system, wherein the optical path system comprises a light source, an optical cavity and a light adjustment system, the gas path system comprises a sample gas path, a protection gas path, an electromagnetic triple valve, an aerosol filter and a gas pump, the electromagnetic triple valve and the aerosol filter are arranged on the front portion of the optical cavity, the gas pump is arranged on the rear portion of the optical cavity, the electromagnetic triple valve, the aerosol filter and a relay form an automatic zero calibration device, the electrical circuit system comprises an optical path control part and a data acquisition part, the optical path control part comprises a digital delay generator, and the data acquisition part comprises a photomultiplier tube, a stabilized voltage power supply, a computer and a high-speed data acquisition card. The cavity ring down aerosol extinction spectrometer has the following advantages that: accuracy is high and can achieve 10<-1> Mm<-1>, time resolution is high and can achieve 20 s, and in situ measurement is performed on the sample so as to provide less influence on the sample.
Owner:FUDAN UNIV
Device and method for measuring flame form and temperature synchronously
ActiveCN107782463AEasy to buildImprove reliabilityThermometers using physical/chemical changesColor/spectral properties measurementsPhotovoltaic detectorsFlame propagation
The invention discloses a device and a method for measuring flame form and temperature synchronously. According to the method, the transient flame form is detected with high-speed schlieren, and the flame temperature is detected with TDLAS (tunable diode laser absorption spectroscopy); detection zones of the high-speed schlieren and the TDLAS are focused in the same detection zone in a constant-volume combustion bomb respectively, the high-speed schlieren and the TDLAS are controlled synchronously by a digital delay generator, and synchronous detection for the flame form and temperature in thetransient flame propagation process is realized. The device comprises the visual constant-volume combustion bomb, a light source, a pinhole diaphragm, an achromatic Fourier transform lens, an adjustable diaphragm, a high-speed camera, a laser, a laser driver, a function generator, an etalon, a reflector, a photoelectric detector, a data acquisition unit and the like. According to the device and the method, the problem about synchronous measurement for the transient flame form and temperature is solved, the clear flame form is obtained with the high-speed schlieren, the high-temporal-resolution flame temperature is obtained with the TDLAS, and combustion characteristics of transient flame are researched through combination of two results of the flame form and temperature.
Owner:SHANGHAI JIAO TONG UNIV
Generation method and device of Z-pinch shell plasma column
ActiveCN103874312AHigh Radiant Power OutputEasy to manufacture and installPlasma techniqueHigh pressureZ-pinch
The invention discloses a generation method and device of a Z-pinch shell plasma column. The device comprises a vacuum plasma target chamber, a pulse current generator, an annular laser spot generation device and a digit delay generator, wherein a load high-voltage electrode and a load ground electrode matched with the load high-voltage electrode are installed inside the vacuum plasma target chamber; a hole is formed in the load ground electrode; a transparent window is formed in the wall of the vacuum plasma target chamber; the load high-voltage electrode, the hole in the load ground electrode and the transparent window are coaxially arranged; the pulse current generator and the input end of the annular laser spot generation device are connected with the digit delay generator; the output end of the pulse current generator is connected with the load high-voltage electrode; a light outlet of the annular laser spot generation device and the transparent window are coaxially arranged. The method and device avoid an uneven structure and the like of a guide plasma caused in the process of forming the shell plasma column through cold and solid materials, and at the same time, the load structure is simpler, installation is convenient, and parameters are adjusted conveniently.
Owner:XI AN JIAOTONG UNIV
High-speed train energy-saving resistance reducing method and device
InactiveCN107089238AGood drag reduction effectReduce aerodynamic dragAxle-box lubricationLocomotivesMeasurement deviceEngineering
The invention discloses a high-speed train energy-saving resistance reducing method and device. Air flow is induced to change on a headstock windward side so as to change the layering condition of an air flow boundary layer, and the headstock wind resistance is reduced. By changing input voltage, the speed and size of induced air flow generated by a plasma generation device are controlled, the plasma generation device is adjusted at the same time, the geometric structure and position of an electrode of the plasma generation device are changed, the speed and direction of the generated induced air flow are adjusted, and induced air flow needed for achieving the optimal resistance reduction of a high-speed train can be obtained; and the two ends of the plasma generation device are connected with an electrical parameter measurement device, a power amplifier switch thyristor is triggered by a digital delay generator, and a pressure monitoring system is connected with a PC terminal. The high-speed train energy-saving resistance reducing method and device can effectively reduce pneumatic resistance borne in the driving process of the high-speed train and achieve the purposes of saving energy and improving operation safety.
Owner:SOUTHWEST JIAOTONG UNIV
System and method for measuring instantaneous gas density for conversion from long-air-gap streamer discharge to leader discharge
ActiveCN108931459AImprove spatial resolutionOvercoming the problem of reduced spatial resolutionSpecific gravity measurementTelephoto lensTime domain
The invention relates to a system and method for measuring instantaneous gas density for conversion from long-air-gap streamer discharge to leader discharge. The system includes an LED chip, a bean expanding lens, a main lens, a convergent lens, a knife edge, a telephoto lens and an ICCD camera. A discharge zone is generated between the main lens and the convergent lens. A coupling lens focuses self-luminescence generated by discharging and transmits the self-luminescence into a photomultiplier. The photomultiplier converts optical intensity time domain signals of the discharge self-luminescence into a voltage waveform and inputs the voltage waveform into a TTL pulse formation circuit. An output end of the TTL pulse formation circuit is connected to an input end of a digital delay generator, and the output end of the digital delay generator is connected to a pulse drive power supply and the ICCD camera separately. The system and the method can achieve accurate inversion measurement ofan ns-stage instantaneous gas density distribution rule in a process of conversion from long-air-gap streamer discharge to leader discharge, and have advantages of high system reliability and a high capturing efficiency.
Owner:HUAZHONG UNIV OF SCI & TECH
Pantograph-overhead-contact-line-system arc plasma multi-parameter acquisition method and apparatus
InactiveCN107064753AAccurate measurementEasy to installTesting using optic methodsPlasma techniqueData acquisitionEngineering
The invention discloses a pantograph-overhead-contact-line-system arc plasma multi-parameter acquisition method and apparatus. The apparatus comprises an arc spectrum acquisition device, an electrical parameter measuring device, a physical parameter measuring device and a digital delay generator. A pantograph sliding plate and an overhead contact line system wire are connected with the electrical parameter measuring device and the physical parameter measuring device. A data acquisition card, a linear displacement sensor and the arc spectrum acquisition device are triggered by the digital delay generator. The apparatus is simple and free of interference, and can accurately measure the internal parameters of the plasma, and completely reflects the ablation state of the pantograph-overhead-contact-line-system arc plasma by synchronously acquiring multiple arc parameters in real time such as pantograph-overhead-contact-line-system arc plasma emission spectrum, voltage and current, and clearance distance.
Owner:SOUTHWEST JIAOTONG UNIV
System and method for measuring hyper-velocity impact debris cloud three-dimensional structure
ActiveCN108775998AAvoid interferenceAchieve recordUsing optical meansShock testingMeasuring instrumentCcd camera
The invention discloses a system for measuring a hyper-velocity impact debris cloud three-dimensional structure. The system comprises a target chamber which is used for simulating the space environment; a target surface which is arranged on the target chamber, wherein the projectile collides with the target surface to generate the debris cloud; a velocity measuring instrument which is used for measuring the motion velocity of the projectile and calculating the motion time from the projectile to the target surface; a pulse laser which emits laser to the debris cloud; a beam expander which expands and collimates the emergent light of the pulse laser; a first lens module which realizes reduction of the beams passing through the debris cloud; a CCD camera which records the hologram of the debris cloud; a digital delay generator; a filter module which is installed in front of the CCD camera to weaken the laser and enhance the signal-to-noise ratio; an oscilloscope which records the time sequence of the velocity measuring instrument, the CCD camera exposure and the laser emergent voltage signal; and a computing module which acquires the debris cloud hologram recorded by the CCD camera and performs reconstruction by using the hologram reconstruction software so as to obtain the three-dimensional structure of the debris cloud and the size of the debris.
Owner:ZHEJIANG UNIV
High-perturbation-resistance laser seed source system based on single-polarization transmission fibers
ActiveCN106356703ASolving the problem of the decrease of laser polarization extinction ratioAmplitude Frequency Modulation ReductionActive medium shape and constructionLine widthOptoelectronics
The invention relates to a high-perturbation-resistance laser seed source system based on single-polarization transmission fibers. The high-perturbation-resistance laser seed source system based on single-polarization transmission fibers comprises a narrow-line-width continuous fiber laser, a single-polarization acousto-optical chopper, a single-polarization fiber amplifier, a phase modulator, a single-polarization amplitude modulator, a clock frequency source, an arbitrary waveform generator and a digital delay generator, wherein the digital delay generator successively triggers the single-polarization acousto-optical chopper and the arbitrary waveform generator; and a phase modulating signal is generated by the clock frequency source, is loaded on the phase modulator, simultaneously is inputted to the arbitrary waveform generator and is used as a reference clock, so that phase locking is realized, and finally laser pulse with arbitrary pulse width is obtained. By the high-perturbation-resistance laser seed source system based on single-polarization transmission fibers, amplitude-frequency modulating caused by phase modulating spectrum broadening can be inhibited effectively, influences of the laser seed source system to laser pulse amplitude-frequency modulating and influences of external environments (including temperature and stress) are reduced, and quality of laser pulses output by a laser seed source is improved.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Laser opto-ultrasonic dual detection method and device for detecting elements, defects and residual stress simultaneously
PendingUS20210396652A1Overcomes shortcomingRealize visualizationAnalysing solids using sonic/ultrasonic/infrasonic wavesMaterial analysis by optical meansAnalytical controlMaterials science
The disclosure discloses a laser opto-ultrasonic dual detection method and device using a pulse laser incident on the surface of a sample to generate plasma and the optical emission and ultrasonic waves are generated, to simultaneously analyze the element compositions, structural defects and residual stress of the sample. The detection system includes an excitation unit, a spectrum detection module, an ultrasonic detection module and an analysis control module. The digital delayer generator is connected to the computer, the high-precision 3D displacement platform is electrically connected to the digital delayer generator. The the pulsed laser is focused on and incident onto the surface of the sample to be tested through modulation of the optical path system to generate plasma, which simultaneously generate optical emission and ultrasonic waves. The ultrasonic detection unit is configured to detect the ultrasonic waves. The spectrum detection unit is configured to detect the plasma emission spectrum.
Owner:HUAZHONG UNIV OF SCI & TECH
Quantitative phase-contrast and excitation-emission systems
InactiveUS8264694B2Material analysis by optical meansUsing optical meansInterference phenomenonRefractive index
An optical system includes an optical interferometer that generates interference phenomena between optical waves to measure multiple distances, thicknesses, and indices of refraction of a sample. An excitation-emission device allows an electromagnetic excitation and emission to pass through an objective in optical communication with the sample. An electromagnetic detector receives the output of the optical interferometer and the excitation-emission device to render a magnified image of the sample. A digital delay generator synchronizes the optical interferometer and excitation-emission device to operate in substantially unison to generate a noninvasive depth of field of the portion of the sample that corrects a plurality of optical aberrations in real-time.
Owner:UT BATTELLE LLC
System and method for synchronously measuring spraying macromorphology and microscope properties
InactiveCN105628566APrecise control of thermodynamic parametersChange structure layout designParticle size analysisCombustionEngineering
The invention discloses a system and method for synchronously measuring spraying macromorphology and microscope properties. The system comprises a constant-volume combustion device, a fuel supply system, an LED (light emitting diode) lamp, a high-speed camera, a digital delay generator and a phase Doppler particle analyzer, wherein the fuel supply system is provided with a controller; the constant-volume combustion device consists of a box body and a combustion projectile body; the combustion projectile body is provided with four observation holes in the shape like a through hole; the axial lines of the observation holes are on the same horizontal plane; the angle between the axial lines of the two observation holes is 180 degrees; the included angle between the axial lines of the other two observation holes is 160 degrees; an optical observation window is arranged in each observation hole; the constant-volume combustion device is communicated with the fuel supply system; the controller is connected with the digital delay generator; the digital delay generator is connected with the phase Doppler particle analyzer and the high-speed camera. By the measuring method using the measuring system, the goal of synchronously measuring the spraying macromorphology and the microscope properties in the constant-volume combustion device is realized.
Owner:TIANJIN UNIV
System and method for measuring spray micro-characteristics in constant-volume combustion device
InactiveCN105588788APrecise control of thermodynamic parametersChange structure layout designParticle size analysisCombustionEngineering
The invention discloses a system and a method for measuring spray micro-characteristics in a constant-volume combustion device. The system comprises the constant-volume combustion device, a fuel supply system, a digital delay generator and a phase Doppler particle analyzer, wherein the fuel supply system is provided with a controller; the constant-volume combustion device comprises a box and an incendiary bomb body, the incendiary bomb body is provided with four observation holes in through hole shapes, axes of the observation holes are located in the same horizontal plane, an angle between the axes of two observation holes is 180 degrees, an angle between the axes of the other two observation holes is 160 degrees, optical observation windows are mounted at the observation holes, and a connection hole communicated with the fuel supply system is arranged right in the upper part of the middle of the constant-volume combustion device; the controller is connected with the digital delay generator; an output end of the digital delay generator is connected with the phase Doppler particle analyzer. With adoption of the measurement method using the measurement system, the spray micro-characteristics can be measured in the constant-volume combustion device.
Owner:TIANJIN UNIV
Micropore double-electrode plasma assisted collision diffusion combustion device
PendingCN110049611AImprove stabilityHigh speedCombustion apparatusPlasma techniqueElectricityCombustion
The invention discloses a micropore double-electrode plasma assisted collision diffusion combustion device. Gas ionization is carried out by using a micropore double-electrode structure with nanosecond pulse to form plasma, and low-temperature oxidation and combustion chain reaction of fuel are accelerated. The abovementioned device comprises a pulse power supply, a double-electrode structure anda closed container. The pulse power supply comprises a nanosecond pulse power supply converter, which can be connected with an alternating current and digital delay generator. The pulse power supply is electrically connected with the double-electrode structure, and the gas stored in the closed container can be sprayed to the double-electrode structure. The double-electrode structure comprises a double-layer metal sheet and single-layer medium, wherein the single-layer medium is arranged in the middle of the double-layer metal sheet, the metal sheet and the single-layer medium are both providedwith micropores, and the micropores are uniformly distributed in the metal sheet and the single-layer medium.
Owner:SHANDONG NORMAL UNIV
Method and device for loading high-speed flyer based on electrical explosion and laser coupling
The invention discloses a method and a device for loading a high-speed flyer based on electrical explosion and laser coupling. The device comprises a high-voltage capacitor discharge unit, an MCT high-voltage switch driving module, a solid pulse laser, an optical element and a digital delay generator, wherein the high-voltage capacitor discharge unit comprises a high-voltage capacitor, an MCT high-voltage switch and an exploding foil chip based on a transparent glass substrate; the digital delay generator is used for sending pulse signals to the MCT high-voltage switch driving module and the solid pulse laser. When the metal bridge foil generates electrical explosion under the effect of capacitor discharge, laser beams are incident to an electrical explosion product, namely plasma through the transparent glass substrate, secondary energizing is conducted on the plasma, and electric explosion and laser coupling accelerated flyer are realized. Laser and electric explosion are combined, secondary energizing is carried out on a metal electric explosion product by using laser, the temperature and pressure of plasma are improved, secondary acceleration is realized, and a new means is provided for research of impact dynamics.
Owner:NANJING UNIV OF SCI & TECH
Method and device for cleaning micro-nano particles by time-controlled double-beam laser induced shock waves
InactiveCN113210357AAvoid direct interactionNo damage advantageFlexible article cleaningShock waveLight beam
A method for cleaning micro-nano particles by time-controlled double-beam laser induced shock waves comprises the steps that a to-be-cleaned substrate is placed on a three-dimensional moving platform, and the three-dimensional moving platform is moved so that the surface of the to-be-cleaned substrate can be located below a laser focusing point; double-beam laser beams are focused in gas above the surface of the to-be-cleaned substrate through two focusing mirrors to induce gas breakdown; the double-beam laser beams are generated by two lasers, the delay time between the double-beam laser beams is regulated and controlled by a digital delay generator, and the time interval between the two laser beams is 0-100 microseconds; plasma shock waves are generated, and micro-nano particle pollutants on the to-be-cleaned substrate are erased under the action of shock wave force and fly away from the surface of the to-be-cleaned substrate. The invention further provides a device for cleaning the micro-nano particles by the time-controlled double-beam laser induced shock waves. According to the method, residual particles under shock waves can be effectively removed while the advantages of a traditional laser-induced plasma cleaning technology are reserved, and the cleaning efficiency is improved.
Owner:ZHEJIANG UNIV OF TECH
An ultra-high time-resolved in-situ 5d TEM test device and its application method
ActiveCN111463095BRealize high-resolution 4D omnidirectional characterizationElectric discharge tubesMaterial analysis by transmitting radiationFemto second laserPhotocathode
The invention discloses an ultra-high time-resolution in-situ 5D TEM testing device and a method for using the same, belonging to the technical field of nano-in-situ 5D TEM testing, including: a laser module, an in-situ operation module, an imaging module, an observation and recording module, a laser The modules include femtosecond lasers, nanosecond lasers, digital delay generators and reflectors. The in-situ operation modules include sample rods and integrated operating tables. And the recording module includes fluorescent screen and high-speed camera. The device and method of use provided by the present invention combine the three-dimensional space transformation and 360° rotation of the sample with nanosecond-level ultra-high time resolution. In-situ TEM testing and characterization of samples has great flexibility and precision.
Owner:WUHAN UNIV
Femtosecond-nanosecond ultra-pulse laser smoothing system for ceramic matrix composites
ActiveCN111716004BRegulating Evolving BehaviorImplementation timeLaser beam welding apparatusFemto second laserPulse sequence
A femtosecond-nanosecond superpulse laser smoothing processing system for ceramic matrix composite materials, including a computer control system. The computer control system is connected to the superpulse optical path system, the monitoring system and the laser processing system respectively. The computer control system first controls the superpulse optical path. The system emits light and adjusts parameters, and then feeds back the optical path status through the monitoring system. After confirming that the super-pulse optical path system is normal, the sample is finally prepared through the laser processing system; the computer control system includes a computer, which is connected to the femtosecond laser and the femtosecond laser through a digital delay generator. Nanosecond laser; the super-pulse optical path system includes a femtosecond laser double pulse sequence optical path, a nanosecond laser single pulse sequence optical path, and a femtosecond-nanosecond laser combined beam optical path; the present invention utilizes a femtosecond laser double pulse sequence and a nanosecond laser single pulse The sequence is combined into a super-pulse laser with pulse timing control and parameter matching coupling to achieve efficient and high-quality surface smoothing processing of ceramic matrix composite materials.
Owner:XI AN JIAOTONG UNIV
Laser probe micro-area component analyzer based on double laser light source
ActiveCN101782517BLow detection limitImprove analysis accuracyAnalysis by material excitationMountingsFiberLaser probe
The invention belongs to the technical field of laser probing, in particular to a laser probe micro-area component analyzer based on a double laser light source. The laser probe micro-area component analyzer comprises a fixed wavelength laser device, an attenuator, a beam expanding mirror and an aperture diaphragm; first semi-permeable half-mirrors are arranged on the same horizontal light path according to the structure; after a wavelength tunable laser device is reflected onto the first semi-permeable half-mirrors by a second totally reflecting mirror, the wavelength tunable laser device has the same light path with the laser beam of the fixed wavelength laser device; the fixed wavelength laser device and the wavelength tunable laser device can be arranged up and down or in parallel, and the starting sequence and the time delay thereof can be controlled by a digital delay generator; a fibre-optical probe receives laser, then the laser is transmitted to a grating spectrometer by the optical fibre, and the acquisition time of a plasma spectra reaching enhancement mode CCD is controlled by the digital delay generator. The laser probe machine stimulated by the double laser light sources has low detection limit, high element analysis precision and favourable element selectivity, is reliable and safe, and can be used for accurately determining the nature of microelements and traceelements of the micro-areas of various substances as well as carrying out accurate quantitative analysis.
Owner:HUAZHONG UNIV OF SCI & TECH
A method and device for energy saving and drag reduction of high-speed trains
InactiveCN107089238BReduce aerodynamic dragImprove aerodynamic characteristicsAxle-box lubricationLocomotivesAmplifierOperation safety
Owner:SOUTHWEST JIAOTONG UNIV
Coin screening system based on laser induced breakdown spectroscopy technology, and using method thereof
PendingCN110220886AStable positionImprove detection efficiencyAnalysis by thermal excitationCleaning processes and apparatusLaser lightLaser-induced breakdown spectroscopy
The present invention discloses a coin screening system based on a laser induced breakdown spectroscopy technology. The system is characterized in that: a loading tray is a horizontally arranged circular structure, and a plurality of coin grooves are arranged on the upper surface of the loading tray; a drop channel is arranged on one side of the loading tray, the lower end of the drop channel extends directly above one of the coin grooves, and the upper end of the drop channel extends obliquely upward and communicates with the output end of a cleaning device; a lens is arranged directly aboveanother coin groove, and a mirror is obliquely arranged directly above the lens; the output end of a first laser is horizontally arranged toward the mirror, and the first laser light emitted by the first laser is reflected by the mirror on the lens and then focused on a discarded coin; and a digital delay generator is horizontally arranged on one side of the first laser, and the digital delay is connected with the first laser. According to the system provided by the present invention, by integrating the coin cleaning and the coin detection and replacement, frequent replacement of discarded coins is avoided, and the efficiency and accuracy of the coin detection are improved.
Owner:NANJING UNIV OF INFORMATION SCI & TECH
A system and method for measuring the three-dimensional structure of a hypervelocity collision debris cloud
ActiveCN108775998BAvoid interferenceAchieve recordUsing optical meansShock testingMeasuring instrumentCcd camera
The invention discloses a system for measuring a hyper-velocity impact debris cloud three-dimensional structure. The system comprises a target chamber which is used for simulating the space environment; a target surface which is arranged on the target chamber, wherein the projectile collides with the target surface to generate the debris cloud; a velocity measuring instrument which is used for measuring the motion velocity of the projectile and calculating the motion time from the projectile to the target surface; a pulse laser which emits laser to the debris cloud; a beam expander which expands and collimates the emergent light of the pulse laser; a first lens module which realizes reduction of the beams passing through the debris cloud; a CCD camera which records the hologram of the debris cloud; a digital delay generator; a filter module which is installed in front of the CCD camera to weaken the laser and enhance the signal-to-noise ratio; an oscilloscope which records the time sequence of the velocity measuring instrument, the CCD camera exposure and the laser emergent voltage signal; and a computing module which acquires the debris cloud hologram recorded by the CCD camera and performs reconstruction by using the hologram reconstruction software so as to obtain the three-dimensional structure of the debris cloud and the size of the debris.
Owner:ZHEJIANG UNIV
Laser seed source system based on single polarization transmission fiber with high perturbation resistance
ActiveCN106356703BSolving the problem of the decrease of laser polarization extinction ratioAmplitude Frequency Modulation ReductionActive medium shape and constructionLine widthOptoelectronics
The invention relates to a high-perturbation-resistance laser seed source system based on single-polarization transmission fibers. The high-perturbation-resistance laser seed source system based on single-polarization transmission fibers comprises a narrow-line-width continuous fiber laser, a single-polarization acousto-optical chopper, a single-polarization fiber amplifier, a phase modulator, a single-polarization amplitude modulator, a clock frequency source, an arbitrary waveform generator and a digital delay generator, wherein the digital delay generator successively triggers the single-polarization acousto-optical chopper and the arbitrary waveform generator; and a phase modulating signal is generated by the clock frequency source, is loaded on the phase modulator, simultaneously is inputted to the arbitrary waveform generator and is used as a reference clock, so that phase locking is realized, and finally laser pulse with arbitrary pulse width is obtained. By the high-perturbation-resistance laser seed source system based on single-polarization transmission fibers, amplitude-frequency modulating caused by phase modulating spectrum broadening can be inhibited effectively, influences of the laser seed source system to laser pulse amplitude-frequency modulating and influences of external environments (including temperature and stress) are reduced, and quality of laser pulses output by a laser seed source is improved.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Long-gap streamer pilot discharge conversion instantaneous gas density measurement system and method
ActiveCN108931459BImprove spatial resolutionOvercoming the problem of reduced spatial resolutionSpecific gravity measurementTelephoto lensBeam expander
The present invention relates to a long-gap streamer pilot discharge conversion instantaneous gas density measurement system and method, comprising an LED chip, a beam expander lens, a main lens, a converging lens, a knife edge, a telephoto lens and an ICCD camera arranged in sequence along the optical path direction; A discharge area is generated between the main lens and the converging lens, and the lens is coupled and the self-luminescence generated by the discharge is focused and transferred into the photomultiplier tube, which converts the time-domain signal of the discharge self-luminescence light intensity into a voltage waveform and inputs TTL pulses to form circuit, the output end of the TTL pulse forming circuit is connected to the input end of a digital delay generator, and the output end of the digital delay generator is respectively connected to a pulse driving current source and an ICCD camera. The invention can realize the accurate inversion measurement of ns-level instantaneous gas density distribution law in the streamer-pilot discharge conversion process, and has the advantages of high system reliability and capture efficiency.
Owner:HUAZHONG UNIV OF SCI & TECH
Device and method for simultaneously measuring flame shape and temperature
ActiveCN107782463BEasy to buildImprove reliabilityThermometers using physical/chemical changesColor/spectral properties measurementsPhotovoltaic detectorsFlame propagation
Owner:SHANGHAI JIAOTONG UNIV
Nanosecond pulse-driven dielectric barrier discharge arbitrary-moment surface charge observation system
PendingCN114019261AImprove measurement resolutionTesting using optic methodsEngineeringObservation system
The invention discloses a nanosecond pulse-driven dielectric barrier discharge arbitrary-moment surface charge observation system, which comprises a helium-neon laser source, a light path output end of the helium-neon laser source is sequentially provided with a light beam amplifier, a diaphragm and a polarization beam splitter, wherein a light beam of the laser source is divided into two paths through the polarization beam splitter, one path enters the dielectric barrier discharge unit through the 1 / 8 wave plate, and the other path enters the camera framing unit through the convex lens and the small hole. The camera framing unit is connected with three ICCD cameras so as to realize surface charge observation at any discharge moment; the three ICCD cameras are respectively connected with the digital oscilloscope, the nanosecond pulse power supply and the computer; the nanosecond pulse power supply is connected with a digital delay generator, the digital oscilloscope is connected with a high-voltage probe, and the digital oscilloscope is connected with the near end of the dielectric barrier discharge unit; the output end of the high-voltage probe and the output end of the nanosecond pulse power supply are connected with the far end of the dielectric barrier discharge unit. And the action mechanism of the surface charge on the nanosecond pulse DBD can be perfected.
Owner:XI AN JIAOTONG UNIV
Measuring device and method for visualizing propagation state and characteristics of high-speed deflagration waves
PendingCN113777213AReduce the difficulty of catchingFlexible shootingChemical analysis using combustionMaterial analysis by optical meansEngineeringMechanical engineering
The invention provides a measuring device for visualizing the propagation state and characteristics of high-speed deflagration waves, which comprises a streak window arranged on the side wall of a shock tube of a shock tube experimental platform, a pair of primary mirrors arranged on the two sides of the streak window, a high-frequency LED light source arranged on the upstream of a light path of the primary mirrors, a high-speed camera arranged on the downstream of the light path of the primary mirrors, and a digital delay generator connected with the high-frequency LED light source and the high-speed camera. The invention further provides a corresponding measuring method. The measuring device comprises a signal triggering system connected with the LED light source and the high-speed camera, so that the flash frequency of the light source is synchronous with the shooting frequency of the high-speed camera, and the whole process of detonation wave propagation can be captured. The device is simple in composition and good in operability, and the capturing difficulty of high-speed deflagration waves in the schlieren experiment is reduced.
Owner:SHANGHAI JIAO TONG UNIV
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