33 results about "Digital delay generator" patented technology

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.

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.

A femtosecond-nanosecond ultra-pulse laser smoothing processing system for ceramic matrix composite materials, including a computer control system, the computer control system is respectively connected with the ultra-pulse optical path system, monitoring system and laser processing system, and the computer control system first controls the ultra-pulse optical path The system emits light and adjusts parameters, and then feedbacks the status of the optical path through the monitoring system. After confirming that the ultra-pulse optical path system is normal, the sample preparation is finally performed through the laser processing system; the computer control system includes a computer, and the computer is connected to the femtosecond laser and the laser through a digital delay generator. Nanosecond laser; the ultra-pulse optical path system includes femtosecond laser double pulse sequence optical path, nanosecond laser single pulse sequence optical path and femtosecond-nanosecond laser beam combining optical path; the present invention utilizes femtosecond laser double pulse sequence and nanosecond laser single pulse Sequences are combined to form an ultra-pulse laser with pulse timing control and parameter matching coupling to achieve efficient and high-quality surface smoothing of ceramic matrix composites.

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.

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.

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.

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.

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.

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.