40 results about "Grating spectrometer" patented technology

The invention provides a multi-source fusion spectrum cross-domain high-precision prediction method and system based on transfer learning. The method comprises the following steps: S1, acquiring spectrograms collected by a spectral imaging device under multiple wavelengths; s2, extracting various types of features from the spectrogram; s3, training a fusion model to obtain a trained fusion model; and S4, inputting a to-be-predicted spectrum into the trained fusion model, and outputting a result. According to the invention, 10 <-4 > nm-level wavelength prediction can be achieved in a common industrial camera system, and the level of a scientific research-level grating spectrometer (0.001-0.002 nm) can be reached / exceeded; on a narrow-band, middle-band and wide-band multi-scene cross-domain data set, the mean absolute error (MAE) can be reduced from the nanoscale to the magnitude of 10 <-4 > nm, and excellent robustness is kept under the conditions of noise, feature deficiency and few samples.

The invention discloses a method and device for quickly switching multiple working modes of a grating spectrometer, and the method comprises the steps: 1, laying a grating and a detector on a working turntable, and adjusting the grating and the detector to be concentric and coaxial; and step 2, rotating the working turntable and the grating respectively, adjusting different incident angles of the grating and adjusting the angle of the detector to match the working wave band. The grating, the camera system and the detector are mounted on the same rotary table, so that the consistency of an optical system in the mode switching process is ensured, and the grating, the camera system and the detector are ensured to be coaxial in the working mode switching process. The mode that the rotary table rotating motor drives the rotary table to rotate as a whole and the grating rotating motor drives the grating to rotate independently is combined, rapid switching of multiple working modes of the grating spectrometer is completed, and broadband wavelength coverage of the grating spectrometer with multiple exposure combined is achieved.

The invention provides a slit-type spectral imaging method based on filtering phase reconstruction and a grating spectrometer. The method comprises the following steps: measuring wavefront aberration of a slit-type grating imaging spectrometer before slit filtering by using a wavefront sensor; based on a slit filtering principle, reconstructing a phase function after slit filtering by using wavefront aberration before slit filtering; and capturing a slit image, and reconstructing the slit image by using the reconstructed filtered phase function of the slit to obtain a final reconstructed image. According to the method, effective recovery of the slit imaging data of the grating spectrometer based on the slit is realized, the influence of optical aberration and image noise on the spectrum and spatial resolution of the spectrometer is effectively eliminated, and the slit imaging quality is remarkably improved and is close to the diffraction limit.

The invention discloses an optical sensing system based on double Fabry-Perot cavities. The optical sensing system comprises a laser module, a main light path module and a reference light path module, wherein the laser module is used for generating two laser beams which respectively enter a main light path and a reference light path; the reference light path module is used for providing a light source fluctuation reference signal for noise compensation; the main light path module comprises a double Fabry-Perot cavity sensing unit, a total reflection mirror, a focusing lens, a grating spectrometer, an optical detector and a signal processing unit. A double-Fabry-Perot cavity sensing unit in the main light path module adopts a novel micro-hemisphere double-cavity interference structure, and temperature and pressure changes are tested in combination with a synchronous resolving method. According to the technical scheme provided by the invention, the synchronous high-precision measurement of the temperature and the pressure can be realized by optimizing the structural design of the cavity, deepening the coupling effect of the gas medium and the physical quantity and introducing a high-precision decoupling algorithm and a noise suppression mechanism, and the application requirements of complex and harsh scenes are met.

This invention discloses a downconversion fluorescence thermometry method based on bilinear mode, implemented using a hardware system. The hardware system includes a 280nm light-emitting diode, two convex lenses, and a Tb... 3+ :Cs2Na 0.9 Ag 0.1 The system comprises InCl6 temperature-sensing material, a grating spectrometer, an oscilloscope, a signal generator, a computer, and a thermostat. The specific implementation steps are: signal excitation and acquisition; temperature calibration; actual temperature measurement; and high measurement accuracy: VPR mode linear correlation coefficient R² ≥ 0.998, FL mode linear correlation coefficient R² ≥ 0.992, avoiding measurement errors introduced by the exponential bias or correction term of traditional FIR technology, thus fundamentally improving temperature measurement accuracy.

The utility model provides a high-frequency monochromator, which is characterized by comprising a spectrograph and a scanning emitting mechanism, and the scanning emitting mechanism is loaded after the spectrograph emits a light beam. An entrance slit, a spectrograph, a field diaphragm, a collimation optical assembly, a rotary reflector or a rotary reflector with a grating light splitting function, a convergence imaging assembly and an exit slit are sequentially arranged along a light path, and light is emitted through the field diaphragm and the exit slit to form an L-shaped light path; the entrance slit, the spectrograph, the field diaphragm, the collimation optical assembly, the rotary reflecting mirror or the rotary reflecting mirror with the grating light splitting function, the convergence imaging assembly and the exit slit are all vertically fixed to the horizontal plane, and the rotary reflecting mirror or the rotary reflecting mirror with the grating light splitting function is arranged at the switching position of the L-shaped light path; the monochromator is simple in light splitting structure and efficient in light splitting.

This invention discloses a plasma local current measurement device and method based on optical methods, belonging to the field of optical measurement technology. The device includes: a high-energy pulsed laser, a beam splitter, a photodiode for triggering an ICCD camera, a beam sampling mirror for providing optical signals to the photodiode, a focusing lens for focusing the high-energy pulsed laser, a pulsed power device for generating Z-pinch plasma, a beam collector, an achromatic lens for collecting scattered light, a reflective grating spectrometer, an ICCD camera, and a Mach-Zehnder interferometer. Electron density distribution, electron temperature, ion temperature, plasma velocity, and relative electron-ion drift velocity can be simultaneously obtained through plasma interference fringe images and Thomson scattering spectra. The local current at the measurement point is obtained by multiplying the electron density, electron charge, and relative electron-ion drift velocity at the measurement point.

The application discloses a self-supporting thin film photocathode design method for improving the dynamic range of a transmission grating spectrometer, and the photocathode is designed by using a self-supporting thin film and an equal-width photocathode slit, so that the difference in photoelectron density in the high-energy area and the low-energy area of a diffraction spectrum is reduced, the dynamic range of the time-resolved transmission grating spectrometer is improved, and the time resolution of the spectrometer along the length direction of the photocathode is kept unchanged. Compared with a conventional equal-width photocathode and a flat-response photocathode, the self-supporting thin film photocathode can reduce the difference in photoelectron density in the high-energy area and the low-energy area of the diffraction spectrum on the photocathode, and improve the dynamic range of the spectrometer. Compared with a width-second-gradual photocathode, the self-supporting thin film photocathode can keep the time resolution of the time-resolved transmission grating spectrometer along the length direction of the photocathode unchanged, and solve the problem that the quantitative spectral analysis is difficult due to the change of the time resolution of the width-second-gradual photocathode along the length direction of the photocathode.

The invention relates to the technical field of spectral measurement, in particular to a compact broadband grating spectrometer and a spectral measurement method thereof.The compact broadband grating spectrometer comprises a vacuum chamber, a broadband light source, a slit assembly, a multi-grating control tower assembly and a detector assembly, and the multi-grating control tower assembly is arranged in the vacuum chamber; comprising a plurality of concave-surface variable-pitch diffraction gratings which are arranged on a grating turret mechanism and have different center line densities, the concave-surface variable-pitch diffraction gratings are switched between a working position and a non-working position along with rotation of the grating turret mechanism, and a grating mirror receives light beams from an incident window, disperses the light beams and reflects the light beams to an emergent window; and the detector assembly receives the dispersed spectral signal and realizes focusing detection. The multi-grating configuration capable of being rotatably switched is utilized, the wave band coverage range is effectively expanded on the premise that a complex mechanical structure is not introduced, the concave-surface variable-pitch gratings have the dispersion and focusing functions, the light path structure is simplified, aberration is reduced, and miniaturization and high resolution of the system are achieved.

The invention provides an automatic wavelength calibration method and device for a grating spectrometer, and belongs to the field of spectral analysis, and the method comprises the steps: collecting a spectrum of a selected atomic spectral line lamp, and obtaining a measurement spectrum containing a plurality of peak positions; all peak positions of the measurement spectrum are detected, a plurality of standard peak wavelengths in the standard spectrum of the atomic spectral line lamp are selected at the same time, then the measurement peak combination and the standard peak combination are subjected to proportion matching, and the measurement peak combination with the optimal proportion is screened out; carrying out expansion matching on the residual peak position of the measurement spectrum; and performing polynomial fitting on peaks of all matched spectral data, and calculating central wavelengths of all pixels to complete spectral calibration. The calibration efficiency is remarkably improved, the batch processing requirement is met, the equipment cost and the volume limitation are reduced, and the applicability is improved.

The invention relates to a grating spectrometer, in particular to a calibration device and a calibration method of the grating spectrometer. The calibration device comprises a composite adjustable light source used for providing one or more of an indication light source, a continuous light source or a standard wavelength light source; the dimming device is respectively connected with the composite adjustable light source and the slit of the spectrograph through optical fibers; the first light source target is movably arranged on the surface of a first reflecting mirror of the spectrograph and is used for calibrating the first reflecting mirror; the second light source target is movably arranged on the surface of the diffraction grating of the spectrograph and is used for calibrating the diffraction grating; the third light source target is movably arranged on the surface of a second reflecting mirror of the spectrograph and is used for calibrating the second reflecting mirror; and the fourth light source target is movably arranged on the surface of the CCD of the spectrograph and is used for calibrating the CCD. The calibration device of the grating spectrometer can adapt to grating spectrometers with different optical designs through the composite adjustable light source and the dimming device, the problem of insufficient universality is solved, and the production efficiency is improved.

The invention relates to the field of spectral analysis, and provides a grating spectrometer and a method, the spectrometer comprises a shell and a grating, the grating is arranged in the shell; the temperature measuring unit comprises a light source, an FBG (Fiber Bragg Grating) and a demodulator, an optical fiber is connected with the light source and the FBG, the FBG is arranged at the back of the grating, and the demodulator outputs a reflection wavelength offset delta lambda B; the heater and the refrigerator are arranged in the shell; the calculation unit obtains a regulation and control temperature difference delta T according to the wavelength offset delta lambda B, and obtains regulation and control power P according to the temperature difference delta T; and the controller is used for controlling the heater or the refrigerator according to the regulation power P. The method has the advantages of high temperature control precision and the like.

The invention relates to grating light splitting, and particularly provides a grating spectrometer and method based on optical filter switching, and the grating spectrometer comprises a slit, a grating and a linear array detector. The driving unit is used for arranging the plurality of optical filters on an upstream optical path of the grating in a time division manner, band-pass wavebands of the optical filters are different, the band-pass wavebands comprise a broadband and a narrowband, the plurality of narrowbands are combined into the broadband, and part of the narrowband delta lambda0 cannot be directly received by the detector after being split by the grating; the reflection unit is used for reflecting split light of the narrow wave band delta lambda 0 to the detector, and the detector outputs light intensity I corresponding to the wide wave band, light intensity I2 corresponding to the narrow wave band delta lambda 0 and light intensity I1 of other narrow wave bands directly received by the detector; and the processing unit completes reconstruction of the light intensities I2 and I1 according to the light intensities I, I2 and I1. The method has the advantages of high resolution and the like.

This application discloses an optical sensing system based on dual Fabry-Perot cavities, comprising: a laser module, a main optical path module, and a reference optical path module. The laser module generates two laser beams, which enter the main optical path and the reference optical path respectively. The reference optical path module provides a reference signal for light source fluctuations to compensate for noise. The main optical path module includes: a dual Fabry-Perot cavity sensing unit, a total reflection mirror, a focusing lens, a grating spectrometer, an optical detector, and a signal processing unit. The dual Fabry-Perot cavity sensing unit in the main optical path module employs a novel micro-hemispherical dual-cavity interference structure, combined with a synchronous calculation method to test temperature and pressure changes. The technical solution provided in this application can achieve synchronous high-precision measurement of temperature and pressure by optimizing the cavity structure design, deepening the coupling effect between the gas medium and physical quantities, introducing high-precision decoupling algorithms and noise suppression mechanisms, thus meeting the application requirements of complex and harsh scenarios.

The invention belongs to the technical field of optical metrology testing, and particularly relates to a dispersion polarization spectral imaging system and method based on a Savart polariscope channel. The system comprises a demodulation module, and a front lens group, a polarization modulation module and a grating spectrometer which are sequentially arranged along the direction of an optical axis, the front lens group receives parallel light reflected by a target and enables the parallel light to enter the polarization modulation module, the polarization modulation module separates the parallel light to obtain interferograms with different wavelengths, and the grating spectrometer is used for receiving the interferograms. And the grating spectrometer performs dispersion on the interferograms with different wavelengths, and the demodulation module demodulates the interferograms with different wavelengths at different positions to obtain a polarization image of the target. According to the invention, target multispectral polarization information detection can be realized, the target multispectral polarization information can be obtained, and the detection efficiency is greatly improved.

The invention relates to the technical field of optical instrument design, and discloses a line-distance-variable grating spectrometer performance and tolerance collaborative optimization method, a spectrometer, a system, a terminal and a medium, and the method comprises the steps: constructing a performance evaluation function of the spectrometer; determining an optimization variable, and obtaining a target optimization result meeting requirements according to the performance evaluation function and the optimization variable; performing tolerance analysis according to the target optimization result to obtain an evaluation result; and determining a design result of the spectrometer according to the evaluation result. According to the method, a strict ray tracing method is adopted to replace an approximation formula, the calculation precision is improved, high performance is pursued, and meanwhile it is ensured that the design scheme has the high yield under existing machining and assembling tolerances.

The application discloses a kind of width quadratic gradient light cathode design methods applied to stripe transmission grating spectrometer, comprising the following steps: step S1: with the center of light cathode base as origin (0,0) establishes rectangular coordinate system, light cathode slit length direction is defined as x-axis direction, and light cathode slit width direction is defined as y-axis direction;Step S2: light cathode slit edge coordinates comply with quadratic function and, step S3: establish zero-level center x-axis coordinate of silk.This application has the beneficial effects that: by using width quadratic gradient light cathode design, the signal intensity distribution of X-ray streak camera light cathode can be controlled, the signal intensity difference between high-energy region and low-energy region in transmission grating dispersion spectrum is reduced, and the problem of high dynamic range requirement for X-ray streak camera is solved.

The utility model relates to a spectral analysis technology, and particularly discloses a wavelength-calibratable rotating grating spectrometer which comprises a wavelength screening element, a first collimating element, a rotating grating, a focusing element and a detector which are sequentially arranged along a light path of incident light, and further comprises a standard light source and a second collimating element, the standard light source is arranged between the wavelength screening element and the detector along the light path of the incident light, the light emitting side of the standard light source faces the rotating grating, and the second collimating element is arranged on the light emitting side of the standard light source. The rotating grating spectrometer capable of calibrating the wavelength can realize real-time wavelength calibration.

The present application relates to a kind of chessboard grating spectrometer vortex light beam four-step phase shift interference microscopic imaging system and method, belong to optical imaging field, including laser light source, beam expander, collimating mirror A, beam splitter A, chessboard grating A, collimating mirror B, vortex wave plate group, beam splitter B, beam splitter C, sample to be measured, microscopic objective A, small hole, microscopic objective B, chessboard grating B, mirror B, beam splitter D, camera and computer terminal;The present application uses chessboard grating spectrometer and vortex light phase shift interference in optical microscopic imaging, avoids the use of polarization camera, and can complete single collection interference pattern imaging, and measurement speed is fast, imaging precision is high, real-time is good, principle is simple, etc., provides a novel effective idea for optical microscopic imaging.

The invention provides a micro grating spectrometer. The micro grating spectrometer comprises a shell; the dispersion element and the sensor assembly are arranged on the shell, incident light is dispersed into monochromatic light by the dispersion element along an incident light path and then is reflected to the surface of the sensor assembly at different angles, and spectral information of the incident light is acquired by the sensor assembly; a spectrum dark area is further arranged, and the spectrum dark area is located on a propagation path of the incident light along the incident light path and used for increasing reflection loss of a specific wave band and absorbing energy of a high-sensitivity spectrum band so as to reduce sensitivity differences of all the spectrum bands.

The present invention relates to a method for spectral calibration and correction of an on-orbit grating spectrometer, comprising the following steps: Step 1: Accurate measurement of reference light source characteristics and initial light field modeling; Step 2: In-depth simulation of the light scattering process in a diffuse transmission plate; Step 3: Comprehensive calculation of the process of light transmission to the entrance pupil of the spectrometer; Step 4: Development and implementation of a spectral offset correction strategy. The method for spectral calibration and correction of an on-orbit grating spectrometer of the present invention can complete high-precision spectral tasks and further improve the calibration accuracy. By utilizing the conditions of mercury lamps with different inclinations incident on the diffuse transmission plate of the spectrometer, and performing theoretical analysis and spectral calibration correction, such analysis can complete high-precision spectral calibration. The method for spectral calibration and correction of an on-orbit grating spectrometer of the present invention can improve the precision and accuracy of spectral measurement through precise calculation and analysis, and provide solid technical support for the application of spectral technology in many fields.

The application provides an exhaled gas synchronous detection device and method based on a superimposed spectrum model, and relates to the technical field of exhaled gas detection. The device comprises an LED broadband light source, a band-pass filter, a collimating lens combination, an optical resonant cavity, a converging lens, an optical fiber, a grating spectrometer, a detector and an upper computer. Infrared light emitted by the LED broadband light source passes through the band-pass filter, the collimating lens combination, the optical resonant cavity, the converging lens, the optical fiber and the grating spectrometer in sequence to form a composite light signal. The detector converts the composite light signal into a superimposed spectrum signal. The upper computer is integrated with an exhaled gas synchronous detection method based on the superimposed spectrum model, that is, the superimposed spectrum model is used for decoupling analysis of the superimposed spectrum signal. The technical scheme of the application overcomes the problems in the prior art, such as the superimposed interference of adjacent spectrum lines and high detection cost when synchronously detecting ethanol and n-pentane.

A real-time measurement method and apparatus for long-wave infrared pulse spectra based on nonlinear frequency upconversion is disclosed. The method utilizes a non-oxide semiconductor crystal as the nonlinear medium and employs a narrowband pulse with a center wavelength in the range of 2-2.5 μm as the sampling light. This pulse is summed with the long-wave infrared pulse to be measured, and the resulting summed pulse is received and detected by a near-infrared real-time spectrometer. The combination of the selected sampling light wavelength and the selected crystal generates an ultra-wide phase-matching bandwidth. Through a linear frequency mapping relationship, the spectrum of the long-wave infrared pulse to be measured can be inverted from the detected summed pulse spectrum. By analyzing the spectrum acquired by the near-infrared spectrometer in real time, the spectrum of the long-wave infrared pulse to be measured can be directly and in real-time reconstructed. This invention overcomes the limitations of Fourier transform spectrometers and traditional grating spectrometers in real-time measurement, achieving real-time, mechanical-scan-free measurement of long-wave infrared pulse spectra without requiring a specific repetition frequency for the long-wave infrared pulse.

The invention relates to a partition flat focal field grating spectrometer and a multichannel energy spectrum parallel acquisition system. The partition flat focal field grating spectrometer comprises an inlet collimation and light limiting module, a partition flat focal field concave grating module, a vacuum coupling and precise adjusting assembly and a pulse broadening type framing camera. Signals with different wavelengths are incident to different microstrip cathodes by adopting gratings with different periods, high-time-resolution measurement is performed on spectral signals with a pulse broadening type framing camera with the time resolution superior to 10ps, and multichannel time reference alignment is realized through synchronization of optical path compensation and gating triggering. According to the invention, the time resolution of the system is effectively improved, and the problems in the prior art that the experiment efficiency is low, the channel isolation is insufficient, the geometric matching and adjustment calibration are difficult, the spectrum image is easy to overflow and cut off, and the like are solved.

This invention discloses a mid-step grating spectrometer based on the principle of cross-dispersion and its fabrication method. The spectrometer includes a principal dispersive element, a transverse dispersive element, an area array detector, an optical fiber, and a slit. The principal dispersive element is a mid-step curved grating; the transverse dispersive element is a small-step curved grating. The mid-step curved grating and the small-step curved grating are used in combination to achieve spectral dispersion and point-to-point aberration elimination imaging. The area array detector is placed in the direction of the emitted light; the optical fiber is used to emit the light to be measured; the slit is located after the optical fiber and acts as an aperture stop. This invention uses a mid-step curved grating and a small-step curved grating to perform cross-dispersion, eliminating the need for collimating and focusing mirrors in traditional structures. The structure is compact, and high-resolution detection can be achieved, solving the problems of large number of components, high cost, and complex assembly in traditional cross-dispersion mid-step grating structures.

The embodiment of the present application discloses a grating spectrometer, comprising: a shell, the shell comprises an incident surface, the incident surface is provided with a mounting cavity and a light ray incidence port, the mounting cavity and the light ray incidence port are communicated; a grating device, the grating device is arranged in the mounting cavity, and the grating device is arranged opposite to the light ray incidence port; a spectral analysis element, the spectral analysis element is arranged in the mounting cavity and opposite to the grating device, and the spectral analysis element is arranged on the side of the grating device away from the light ray incidence port; and a calculation controller, the calculation controller is arranged in the shell, and the calculation controller is electrically connected with the spectral analysis element. The user can know whether the illumination light in the current environment is healthy light in real time and accurately through the judgment result, so as to help the user understand whether the current light environment is healthy, thereby avoiding the user staying in the harmful light environment for a long time, preventing the damage to the vision, and protecting the illumination health of the user.

The present application relates to quantum light sparse positioning technical field, specifically speaking, it is a kind of precision dispersion grating spectrometer structure and quantum light sparse positioning device and method thereof, including installation platform, the support mechanism is equipped on the installation platform, the normalization mechanism is equipped on the installation platform, the slit mechanism is equipped on the installation platform, the adjusting mechanism is equipped on the slit mechanism, the reflection mechanism and the detection mechanism are equipped on the installation platform;Slit mechanism is arranged on installation platform, adjusting mechanism is arranged on slit mechanism, through slit mechanism and adjusting mechanism, thereby the spacing between slit assembly, longitudinal intensity modulation optical element and reflecting element is adjusted conveniently and quickly, combined with light sparse peak value technology and nonlinear optical technology, the accuracy of the instrument is ensured and stability is realized, the accuracy is high and better than traditional dispersion type spectrometer two orders of magnitude, simultaneously, the adjustment precision of slit spacing can also be improved according to actual situation, so that operation is more convenient;The reflection mechanism is arranged on the installation platform, the reflection angle of reflecting assembly can be adjusted at any time according to actual situation through reflection mechanism, so that use is more convenient.

This invention discloses a binocular imaging spectrometer system, relating to the field of planetary atmospheric exploration technology. The system comprises: a binocular imaging objective group, including two sets of parallel sub-eye objectives used to image ambient light information to form an intermediate image; a dual telecentric imaging objective group, positioned on the image side of the binocular imaging objective group, used to perform secondary imaging of the intermediate image and project it onto the slit location of the spectrometer; and a grating spectrometer, including a slit, a dispersive element, and an imaging camera, with the slit located at a predetermined slit image plane position on the spectrometer; wherein the dual telecentric imaging objective group is telecentric in both the object and image sides, ensuring that the principal ray of the beam entering the slit after secondary imaging is parallel to the system's optical axis. This invention aims to meet the requirements of miniaturization and lightweight payload equipment while achieving high spatiotemporal resolution and wide-band detection.

The invention discloses a high-time-resolution wide-energy-region X-ray spectrum quantitative measurement system and method. The high-time-resolution wide-energy-region X-ray spectrum quantitative measurement system and method have the beneficial effects that quantitative diagnosis of wide-energy-region (0.2 keV-5. 0keV) and high-time-resolution (lt, 40ps) X spectrum is realized by combining a height pair transmission type grating (TG), an X-ray streak camera (XSC) and a flat response radiation flow detector (FXRD), and the time resolution of the system is superior to that of an existing soft X-ray energy spectrometer (-200ps). Compared with an existing time-resolved transmission grating spectrometer, the system realizes quantitative measurement of the wide-energy-region X-ray spectrum intensity evolution process.

A spectral sensor and a method for forming the spectral sensor is disclosed. The spectral sensor includes a planar waveguide on a substrate; a restriction mechanism that restricts a range of angles of incidence of light impinging onto the chirped input coupling grating; the chirped input grating formed to couple incident light into the planar waveguide, wherein the chirped input coupling grating comprises a first transverse chirp to provide a spectrally selective coupling of incident light Into the planar waveguide; a propagation region to filter out light that is not coupled into the planar waveguide; a detector array arranged on the opposite side of the propagation region from the chirped input coupling S grating to receive light coupled out of the planar waveguide and produce output signals representative of the light; and an electrical circuit to readout output signals from the detector array.