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351 results about "Wavelength modulation" patented technology
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A wavelength modulation system utilizes a wavelength modulator that varies the wavelength of observation in a periodic manner; it may consist for example of an oscillating voltage applied to a tunable diode laser light source or an oscillating refractor plate installed in the light path inside the entrance slit of a monochromator.
Chiral Metamaterials
InactiveUS20100141358A1Effective controlEnhance the imagePrinted circuit assemblingMultiple-port networksDielectric substrateLength wave
A metamaterial includes a dielectric substrate and an array of discrete resonators at the dielectric substrate, wherein each of the discrete resonators has a shape that is independently selected from: an F-type shape; an E-type shape; or a y-type shape. A parameter of a chiral metamaterial is determined and a chiral metamaterial having such a parameter is prepared by the use of a model of the chiral metamaterial. The metamaterial model includes an array of discrete resonators. In one embodiment, each of the discrete resonators has a shape that is independently selected from the group consisting of: an F-type shape; an E-type shape; and a y-type shape. To the metamaterial model, electromagnetic (EM) radiation, preferably plane-polarized EM radiation in a visible, ultraviolet or near-infrared region, having at least one wavelength that is larger than the largest dimension of at least resonator of the metamaterial model, is applied. Varying at least one characteristic of the metamaterial model and / or at least one wavelength of the applied EM radiation modulates EM interaction of the applied EM radiation with the metamaterial model, thereby determining a parameter of the chiral metamaterial. By the use of a model of the chiral metamaterial, a number of discrete resonators of a chiral metamaterial that are arrayed in a direction perpendicular to a propagation axis of EM radiation is also determined.
Owner:UNIVERSITY OF MASSACHUSETTS LOWELL
Stereoscopic display apparatus using LCD panel
InactiveUS20070132953A1Increase brightnessProjectorsSteroscopic systemsStereoscopic imagingLight beam
A stereoscopic imaging apparatus (200) has an illumination source (110) providing polarized illumination beams and at least one uniformizing element (22) for uniformizing first and second illumination beams. A left channel modulation apparatus (220l) modulates the first polarized illumination beam to provide the left eye portion of the stereoscopic image and a right channel modulation apparatus (220r) modulates the second polarized illumination beam to provide the right eye portion. Each channel modulation apparatus has a color separator (78) for separating the polarized illumination beam into at least a first component wavelength illumination and a second component wavelength illumination. Each channel modulation apparatus also has at least two component wavelength modulating sections, each component wavelength modulating section being a portion of a monochrome transmissive liquid crystal modulator panel (60) that accepts a corresponding component wavelength illumination and modulates the component wavelength illumination to provide a modulated component wavelength beam.
Owner:EASTMAN KODAK CO
Oxygen sensor for aircraft fuel inerting systems
ActiveUS20050286054A1Transmissivity measurementsColor/spectral properties measurementsFuel tankEngineering
An apparatus and method for monitoring oxygen concentrations in fuel tank ullage comprising providing a sensor head comprising an optical cavity, exposing the optical cavity to an ambient gaseous environment of a fuel tank or air separation module, via a laser light source emitting wavelength modulated light through the cavity, and receiving the wavelength modulated light with a detector.
Owner:SOUTHWEST SCI
Instrument and method for real time monitoring optical fibre distributed multi-point mash gas
InactiveCN101281127AEliminate distractionsConcentration sensitiveColor/spectral properties measurementsData acquisitionEngineering
The invention discloses an optical fiber distributed multi-point methane real-time monitor based on the light wave modulation spectrometry and the monitoring method, a semiconductor DFB laser, an optical fiber splitter, a gas calibration pond, a laser control circuit board, a signal generative circuit board, a lock-in amplified board, a data acquisition card, a control module, a multi-channel analog signal selection switch and a driving circuit are arranged in the main case of the monitor, the main case is connected with miniature optical sensors in various underground detection optical path through dingle mode fibers. The wavelength modulation of a gas laser absorption spectrum is realized by a low frequency scanning signal and a high frequency modulation signal generated by a signal generative circuit. The laser wavelength shift is carried out adaptive adjustment by the built-in gas calibration pond so as to realize the locking of a methane absorption line. The distributed multi-point methane concentration monitoring in the underground coal mine is realized by the switching of the multi-channel analog signal selection switch.
Owner:ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
Gas concentration on-line measurement method based on laser absorption spectrum
ActiveCN102590138AHigh measurement accuracySuppress background noiseColor/spectral properties measurementsHarmonicHigh frequency modulation
The invention relates to a gas concentration on-line measurement method based on laser absorption spectrum, belonging to the technical field of the tunable laser diode absorption spectrum. The Beer-Lambert principle is subjected to second-order Taylor approximation, the gas concentration is determined based on the ratio of absorption signal second harmonic to background signal first harmonic without calibration experiment. During the measurement process, a laser is subjected to high-frequency modulation on the spectrum line center frequency, and the acquired signal is subjected to discrete Fourier transform (DFT) to obtain each harmonic signal. The gas measurement precision is increased, the wavelength modulation technology is applied at the strong absorption condition, and the application range of the tunable diode laser absorption spectroscopy (TDLAS) is expanded. In the experiment, a calibration and application phase-lock technique applied on the laser is omitted, the measurement process and the measurement system are simplified and the wide application of the TDLAS technique is facilitated.
Owner:北京新叶科技有限公司
Fire field multi- parameter optical maser wavelength modulated spectrum detector method and apparatus
InactiveCN101308090AEliminate distractionsSimultaneous online detectionFire alarmsColor/spectral properties measurementsData acquisitionLasing wavelength
The invention discloses a fire scene multi-parameter laser wavelength modulation spectrum detection method and a device thereof, wherein, fire smoke products are treated through a smoke pre-treatment device and then pumped into a white cell through an air extracting pump; a multi-channel laser controller scans and modulates the wavelengths of a plurality of DFB lasers according to the time-sharing and multiplexing working mode, and all waves of laser share an optical fiber and are outputted sequentially through a wave combiner, then are aligned by a fiber collimator and sent to the white cell to detect the fire smoke products; a photoelectric detector converts light intensity signals of laser repeatedly reflected and absorbed by the white cell into electrical signals which are sent to two phase-locking magnifier modules for frequency selecting magnification so as to obtain a fundamental frequency component and a second harmonic component; a multi-channel data acquisition card converts output voltage signals of the phase-locking magnifiers into digital signals which are sent to a micro-computer for real-time data processing, so that the fire scene multi-parameter information containing the oxygen concentration of the fire scene, concentrations of various toxic gases and smoke concentration is obtained. The detection method and device can realize real-time on-line monitoring to fire scene multi-parameters, and have the advantages of being real-time, multi-component and highly sensitive, good selectivity of gas, high reliability and strong environmental disturbance resistance ability.
Owner:UNIV OF SCI & TECH OF CHINA
Spectroscopic apparatus using spectrum narrowed and stabilized laser with Bragg grating
An apparatus for measuring properties of physical matters by means of Raman spectroscopy including a laser element, a wavelength dispersion element, an array or single element detector, and a control and data processing unit. The laser element, which is used to excite Raman scattering, is spectrum narrowed and stabilized by attachment of a Bragg grating device. The grating can be either a volume Bragg grating (VBG) written inside a glass substrate or a fiber Bragg grating (FBG) written inside an optical fiber. A laser element can be provided with a wavelength modulation capability for fluorescence background suppression.
Owner:METROHM SPECTRO INC
Wavelength-modulated coherence pumping and hyperfine repumping for an atomic magnetometer
ActiveUS9869731B1Magnetic field measurement using magneto-optic devicesMeasurements using magnetic resonanceLight beamWavelength modulation
An FM-NMOR magnetometer and concomitant magnetometry method comprising providing a linearly-polarized pump beam generator, employing a center wavelength approximately equal to a center wavelength of hyperfine peaks, and employing a modulation amplitude in the range HFS-3×LW to HFS.
Owner:RGT UNIV OF CALIFORNIA +1
Chiral metamaterials
InactiveUS8271241B2Effective controlEnhance the imagePrinted circuit assemblingMultiple-port networksDielectric substrateLength wave
Owner:UNIVERSITY OF MASSACHUSETTS LOWELL
Spectroscopic apparatus using spectrum narrowed and stabilized laser with Bragg grating
An apparatus for measuring properties of physical matters by means of Raman spectroscopy including a laser element, a wavelength dispersion element, an array or single element detector, and a control and data processing unit. The laser element, which is used to excite Raman scattering, is spectrum narrowed and stabilized by attachment of a Bragg grating device. The grating can be either a volume Bragg grating (VBG) written inside a glass substrate or a fiber Bragg grating (FBG) written inside an optical fiber. A laser element can be provided with a wavelength modulation capability for fluorescence background suppression.
Owner:METROHM SPECTRO INC
Mid-infrared spectroscopy-based trace gas detection method and device combining long-optical-path open light path with wavelength modulation technique
InactiveCN104596987AReal-time concentration change informationOnline Concentration Change InformationColor/spectral properties measurementsBeam splitterPlane mirror
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
Light emitting module for producing a visible light by passive ultraviolet excitation
InactiveUS20080302977A1Discharge tube luminescnet screensLamp detailsUltraviolet lightsWavelength modulation
A light emitting module for producing a visible light by passive ultraviolet excitation includes an excitation light source member and at least one layer of wavelength modulation matrix. The excitation light source member produces an ultraviolet light with a specific wavelength range. The wavelength modulation matrix adopts an organic polymer as a carrier, and the carrier adds a composite material composed of an organic wavelength modulation material, a quantum dot luminescence color rendering modulation material and a nanoparticle brightness enhancement luminescence powder, and the composite material is cured and formed by coating, injection molding, thin film lamination, screen printing or thick film printing, so that when the wavelength modulation matrix is projected by an ultraviolet light beam emitted by the excitation light source member, a light including a visible light is produced.
Owner:ACPA ENERGY CONVERSION DEVICES
Oxygen sensor for aircraft fuel inerting systems
ActiveUS7352464B2Transmissivity measurementsColor/spectral properties measurementsOptical cavityInerting system
Owner:SOUTHWEST SCI
Gas temperature and concentration online measuring method based on first harmonic signal
ActiveCN102680428ASuppress background noiseHigh measurement accuracyColor/spectral properties measurementsWavelength modulation spectroscopyHarmonic
The invention relates to a gas temperature and concentration online measuring method based on a first harmonic signal, which belongs to the technical field of tunable diode laser absorption spectrum (TDLAS). Online measurement of the gas temperature and concentration is realized through the relation between a first harmonic X-axis signal and a first harmonic Y-axis signal and a gas absorption rate functional integral value. The advantages of a direct absorption method in the TDLAS technology are combined with the wavelength modulation method, so that not only is the difficulty that the direct absorption method cannot be applied in a worse environment and a weak absorption condition solved, but also the difficulty that the gas temperature and the gas concentration are determined through a calibration experiment in the measurement of the wavelength modulation method can be solved. Due to the adoption of the method, the measurement precision of the TDLAS technology in the industrial field can be effectively improved, and the application range can be enlarged.
Owner:北京新叶科技有限公司
Multi-component real-time online remote monitoring device and method for coal spontaneous combustion indicator gas
ActiveCN104237161ARealize remote monitoringLow costColor/spectral properties measurementsEngineeringOptical pathlength
The invention discloses a multi-component real-time online remote monitoring device and a method for coal spontaneous combustion indicator gas. For the limit of long distance optical fiber sensing band, the near-infrared band with weaker gas absorption line strength is used for real-time online monitoring the typical alkane gas as CO, CO2, C2H2 and C2H4 in the indicator gas. The multi-component weak signal is detected through the multi-frequency wavelength modulation and novel long optical distance multiple reflection pool technology; the device comprises a laser, a laser controller, a signal generator, a novel multiple reflection pool, an optical fiber collimator, a light beam coupler, a photoelectric detector, a lock-in amplifier, a processing system collecting the signal of A / D and terminal and an anti-explosion case. The device adopts the optical fiber for connection without manpower sampling, the responding sensitivity is high, the device and the method can monitor a variety of indicator gases at the same time with simple operation, good stability and small power, the device is easy to carry and install for field experimentation and the dynamic measuring range is large.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
Non-invasive biothermophotonic sensor for blood glucose monitoring
There is provided a glucose monitoring method and apparatus based on the principle of Wavelength-Modulated Differential Laser Photothermal Radiometry (WM-DPTR). Two intensity modulated laser beams operating in tandem at specific mid-infrared (IR) wavelengths and current-modulated synchronously by two electrical waveforms 180 degrees out-of-phase, are used to interrogate the tissue surface. The laser wavelengths are selected to absorb in the mid infrared range (8.5-10.5 μm) where the glucose spectrum exhibits a discrete absorption band. The differential thermal-wave signal generated by the tissue sample through modulated absorption between two specific wavelengths within the band (for example, the peak at 9.6 and the nearest baseline at 10.5 μm) lead to minute changes in sample temperature and to non-equilibrium blackbody radiation emission. This modulated emission is measured with a broadband infrared detector. The detector is coupled to a lock-in amplifier for signal demodulation. Any glucose concentration increases will be registered as differential photothermal signals above the fully suppressed signal baseline due to increased absorption at the probed peak or near-peak of the band at 9.6 μm at the selected wavelength modulation frequency. The emphasis is on the ability to monitor blood glucose levels in diabetic patients in a non-invasive, non-contacting manner with differential signal generation methods for real-time baseline corrections, a crucial feature toward precise and universal calibration (independent of person-to-person contact, skin, temperature or IR-emission variations) in order to offer accurate absolute glucose concentration readings.
Owner:MANDELIS ANDREAS +1
Wavelength modulated photoacoustic spectrometer
InactiveUS6552792B1Transmissivity measurementsColor/spectral properties measurementsWavelength modulationLength wave
A wavelength modulated photoacoustic spectrometry system and method comprising: generating light from a light source; passing the light through a sample area; sampling sound produced by the light passing through the sample area with an acoustic detector; and controlling wavelength of the light with a wavelength controller, wherein the wavelength controller modulates the wavelength according to a waveform comprising square components.
Owner:SOUTHWEST SCI
Method for measuring gas absorption spectrum line width and line-type coefficient based on wavelength modulation
ActiveCN103323115AEliminate the effects of uncertaintyEliminate the effects ofRadiation pyrometryColor/spectral properties measurementsWavelength modulation spectroscopyHarmonic
The invention discloses a method for measuring the gas absorption spectrum line width and the line-type coefficient based on wavelength modulation. According to the method for measuring the gas absorption spectrum line width and the line-type coefficient based on the wavelength modulation, the specific value between a two-time harmonic and a four-time harmonic in the wavelength modulation spectrum technology are adopted to measure the line width and the line-type coefficient of the spectral line absorbed by the gas. During measurement, the line width and the line-type of the gas absorption spectrum line to be measured are calculated by means of analysis of the specific value between the two-time harmonic and the four-time harmonic. The method for measuring the absorption gas spectrum line width and the line-type coefficient based on the wavelength modulation has the advantages of being easy to operate, high in measuring precision, and capable of eliminating influence of factors such as background signals, laser intensity fluctuation and the photoelectricity amplification coefficient, solving the problem that an existing WMS technology can not accurately measure the line-type parameters absorbed by the gas and broadening the application range of the WMS technology and the like. Due to the fact that the specific value between the two-time harmonic and the four-time harmonic are adopted to calculate the gas absorption line-type parameters, the method for measuring the gas absorption spectrum line width and the line-type coefficient based on the wavelength modulation can be called the R24 method.
Owner:北京新叶科技有限公司
Device, method and system for determining the road surface condition
InactiveUS20060050270A1Radiation pyrometrySpectrum investigationWavelength modulation spectroscopyReflectance properties
The invention relates to a device, a method and a system for determining a road surface condition, where the surface condition is one of dry, wet or icy. The device comprises a reflectance spectrometer which senses the reflectance properties of the road at one or several wavelengths and uses these reflectance properties to determine the surface condition. The reflectance spectrometer is a wavelength modulation spectrometer, preferably for the near infrared region. The system determines the surface condition and indicates it to a user of the system.
Owner:ELMAN ULF
Stereoscopic display apparatus using LCD panel
Owner:EASTMAN KODAK CO
Non-invasive biothermophotonic sensor for blood glucose monitoring
There is provided a glucose monitoring method and apparatus based on the principle of Wavelength-Modulated Differential Laser Photothermal Radiometry (WM-DPTR). Two intensity modulated laser beams operating in tandem at specific mid-infrared (IR) wavelengths and current-modulated synchronously by two electrical waveforms 180 degrees out-of-phase, are used to interrogate the tissue surface. The laser wavelengths are selected to absorb in the mid infrared range (8.5-10.5 μm) where the glucose spectrum exhibits a discrete absorption band. The differential thermal-wave signal generated by the tissue sample through modulated absorption between two specific wavelengths within the band (for example, the peak at 9.6 and the nearest baseline at 10.5 μm) lead to minute changes in sample temperature and to non-equilibrium blackbody radiation emission. This modulated emission is measured with a broadband infrared detector. The detector is coupled to a lock-in amplifier for signal demodulation. Any glucose concentration increases will be registered as differential photothermal signals above the fully suppressed signal baseline due to increased absorption at the probed peak or near-peak of the band at 9.6 μm at the selected wavelength modulation frequency. The emphasis is on the ability to monitor blood glucose levels in diabetic patients in a non-invasive, non-contacting manner with differential signal generation methods for real-time baseline corrections, a crucial feature toward precise and universal calibration (independent of person-to-person contact, skin, temperature or IR-emission variations) in order to offer accurate absolute glucose concentration readings.
Owner:MANDELIS ANDREAS +1
Wavelength modulation spectroscopy for simultaneous measurement of two or more gas ingredients
InactiveUS20100242572A1Reduce measurement errorEasy CalibrationMaterial analysis using wave/particle radiationMaterial analysis using microwave meansGas compositionConcentration ratio
Methods and systems to measure simultaneously concentrations or concentration ratio(s) of two or more gas ingredients in a sample area comprising: a wavelength modulated light source; an acoustic detector or a photodetector; and means to analyze the signal from the acoustic detector or the photodetector and calculate the concentrations or concentration ratio(s). The light from the light source is transmitted through the sample area. Part of the light will be absorbed in the sample area by the gas ingredients and generates photoacoustic signal. The acoustic detector is used to sample the photoacoustic signal. Alternatively, a photodetector is used to sample the light intensity after the light is transmitted through the sample area.
Owner:YU JAMES
Pulse wavelength modulation (PWM) generator based on field programmable gate array (FPGA)
InactiveCN103178815AReduce design costImprove reliabilityPulse duration/width modulationWavelength modulationDigital control
The invention discloses a pulse wavelength modulation (PWM) generator based on field programmable gate array (FPGA). The generator comprises an FPGA, wherein the FPGA is loaded with a decoding interface unit, a triangular carrier generating unit and n PWM signal generating units. The novel PWM signal generator disclosed by the invention can be realized by combining with FPGA hardware programming language and FPGA circuit design software tool, so as to better solve the problem in a high-power electronic system that the precision is affected since computation is heavy and digital control is delayed due to multiple paths of PWM signals; the carrier frequency, the dead time and the enable signal can be designed according to demands of the system, and the application range is wide and flexible application to various situations is realized; and meanwhile, the PWM generator still has the advantages of high reliability, reduced hardware design cost, strong antijamming capability and the like when being applied to other PWM signal generating circuits.
Owner:ZHEJIANG UNIV +1
New nodal real time gas concentration monitoring method and sensor
InactiveCN1945287AReal-time online monitoringStrengthen online monitoringColor/spectral properties measurementsWavelength modulationGas concentration
The new type nodal real-time gas densitymonitoring method and sensor has one near infrared DFB semiconductor laser and operates on the characteristic absorption of methane in the near infrared spectrum region. One monomode fiber power coupler is used in separating the laser beam into several beams led through fibers to fiber gas absorption cells in mine, and the laser beams through the absorbed gas are then led through fiber to the input optical switch. The selected signal through the calibrating cell is projected to the laser detector. By means of wavelength modulating technology and second harmonic detecting technology, the present invention realizes gas density measurement in high sensitivity, high resolution, no gas interference and fast response. Background light strength signal fitting method is adopted to eliminate the influence of light strength fluctuation on the measurement.
Owner:ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
Frequency modulation in the optical alignment of wavelength-converted laser sources
InactiveUS20090022188A1Low costIntensive alignment procedureLaser detailsSemiconductor lasersLight beamWavelength modulation
Methods of controlling semiconductor lasers are provided where the semiconductor laser generates a wavelength-modulated output beam λMOD that is directed towards the input face of a wavelength conversion device. The intensity of a wavelength-converted output λCONV of the device is monitored as the output beam of the laser is modulated and as the position of the modulated output beam λMOD on the input face of the wavelength conversion device is varied. A maximum value of the monitored intensity is correlated with optimum coordinates representing the position of the modulated output beam λMOD on the input face of the wavelength conversion device. The optical package is operated in the data projection mode by directing an intensity-modulated laser beam from the semiconductor laser to the wavelength conversion device using the optimum positional coordinates. Additional embodiments are disclosed and claimed. Laser controllers and projections systems are also provided.
Owner:CORNING INC
Fiber Optic Sensor Thermally Matched Support Tubes for Distributed Fiber Optic Sensing
Distributed fiber optic sensor includes a composite support tube that closely matches the coefficient of thermal expansion of the optical sensing fiber contained therewithin for applications including but not limited to Rayleigh back-scattering, (OFDR, Optical Frequency Domain Reflectometry), Brillouin frequency shift (BOTDA, Brillouin Optical Time Domain Analysis, BOTDR, Brillouin Optical Time Domain Reflectometry), Raman (Optical Time Domain Reflectometry), DPP-BOTDA (Differential Pulse Pair Brillouin Optical Time Domain Analysis), Dual-Index BOTDA, PCF (Photonic Crystalline Fibers), and dense packed Fiber Bragg Gratings, both time and wave length modulated are described in detail.
System and method for simultaneously monitoring multiple components of building fire early-stage characteristic gases
InactiveCN103411919AMeet the needs of early characteristic gas monitoringReal-time online monitoringColor/spectral properties measurementsMultiplexingFrequency-division multiplexing
The invention discloses a system and a method for simultaneously monitoring multiple components of building fire early-stage characteristic gases. Characteristic gases (CO, CO2, C2H2 and HCN) released in a fire early-stage pre-combustion stage are simultaneously detected by adopting a tunable semiconductor laser absorption spectrum-based modulation frequency multiplexing technique; the influence on a measuring result caused by light intensity fluctuation due to gas disturbance in a laser light source and a light path is eliminated by adopting a self-balancing detection technique, and high detection sensitivity is obtained by combining a wavelength modulation technique, and multiple components of the building fire early-stage characteristic gases are simultaneously detected by using a multi-wavelength, self-balancing detection and frequency division multiplexing-based signal detection technique.
Owner:ANHUI UNIVERSITY OF ARCHITECTURE
Composite multi-harmonic-based online gas concentration measurement method
InactiveCN103868885AImprove signal-to-noise ratioHigh sensitivityColor/spectral properties measurementsLine widthLaser intensity
The invention discloses a composite multi-harmonic-based online gas concentration measurement method and belongs to the technical field of tunable diode laser absorption spectroscopy (TDLAS). The method comprises the following steps: determining the line width of an absorption line by virtue of a ratio of second harmonics to quadruple harmonics, and calculating to obtain a linear function; and calculating the gas concentration according to a deduced ratio of second harmonics to first harmonics under strong absorption conditions. According to the method, the gas concentration is measured under the strong absorption conditions by the second and first harmonic signal mark-free method of absorption signals, the influence of laser intensity fluctuation, photoelectric amplification factors and other factors is eliminated, the signal to noise ratio and measurement accuracy are improved, the problem that a concentration measurement error is caused in a wavelength modulation method because the linear function of the absorption line is uncertain is effectively solved, the gas concentration measurement accuracy is improved, and the application range of the TDLAS technology is widened.
Owner:TSINGHUA UNIV
Combustion gas analysis
ActiveUS20100028819A1High analytical sensitivityHigh sensitivityFuel supply regulationColor/spectral properties measurementsGas analysisCombustion
A chemical analysis method for determining the concentration of carbon monoxide, gaseous water and gaseous hydrocarbon in a combustion gas. The method includes the following steps: (a) directing wavelength modulated light from a single tunable diode laser at a wavelength in the range of from 2 to 2.5 micrometers through the combustion gas to a light detector to produce an absorption profile of the combustion gas (b) digitizing the adsorption profile of the combustion gas; (c) storing the digitized adsorption profile in a digital computer; (d) processing the digitized adsorption profile in the digital computer to produce an output from the computer indicative of the concentration of carbon monoxide, gaseous water and gaseous hydrocarbon in the combustion gas.
Owner:YOKOGAWA ELECTRIC CORP
Optical zoom method based on super-structured lens using wavelength modulation
The invention discloses a method for realizing optical zooming, that is, an optical zoom method based on a super-structured lens using wavelength modulation, based on (1) a light source probe, (2) linear polarizing plates, and (3) quarter wave plates, (4) a super-structured (chromatic aberration) lens; the super-structured (chromatic aberration) lens (4) is placed in the middle of two combinationsof the linear polarizing plates and the quarter wave plates, and a photoreceptor (5) is disposed on the imaging surface for receiving images; and incident light of different wavelengths is used to pass through a super-structured (chromatic aberration) lens for imaging at different image distance positions for zooming. There are two kinds of application scenarios: one is that the image distance isfixed, the illumination wavelength and the object distance are adjusted to obtain the change of the size of the imaging image; the second is that the object distance is fixed, and the illumination wavelength and the image distance are adjusted to obtain the change of the imaging size. The method adopts the design principle of the super-structured surface, the chromatic aberration is controlled bythe phase matching, and the spherical aberration and the coma aberration correction can be performed within a certain imaging interval.
Owner:NANJING UNIV
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