305 results about "Spectral resolution" patented technology

The invention belongs to the technical field of computer data processing, and provides a biodiversity inversion method based on multi-source remote sensing image fusion. Comprising the steps of remote sensing image data acquisition, image preprocessing, image fusion processing, multispectral resolution image data generation, spectral feature extraction, final frequency feature extraction, feature integration and target ecological variable prediction. According to the invention, through wave basis adaptive selection and multi-scale wavelet decomposition, spectrum fidelity and space structure maintenance are considered, differential fusion of high and low frequency components under different scales is realized, and multi-source data complementarity and fusion image quality are improved; through spectral resolution refinement processing and multi-bandwidth scale simulation, the limitation of single resolution is broken through, and the capability of capturing complex spectral features of vegetation is enhanced; the spatial correlation is enhanced through spatial neighborhood feature fusion; and through an ecological variable inversion estimation model, multi-index synchronous prediction is realized, and the universality of the model is improved.

The invention is suitable for the technical field of filters, and particularly relates to a manufacturing method of a linear gradient filter and the linear gradient filter. The manufacturing method of the linear gradient filter comprises the following steps that a glass wafer serves as a substrate, and a lower reflecting layer is plated on the surface of the glass wafer; wherein the lower reflecting layer is formed by alternately stacking a plurality of layers of low-refractive-index materials and a plurality of layers of high-refractive-index materials; coating a resonant cavity layer on one side, far away from the glass wafer, of the lower reflecting layer through a stepped coating process; plating a reflecting layer on one side, far away from the glass wafer, of the resonant cavity layer; and plating a long-wave-pass layer on one side, far away from the glass wafer, of the upper reflecting layer and in an area larger than the central wavelength to obtain the linear gradient filter. Compared with the prior art, the linear gradient filter provided by the invention is better in spectral resolution in a long wave band, smaller in energy difference of channels, excellent in wavelength selection performance and capable of being applied to spectrum applications such as a miniaturized infrared spectrometer and the like.

The invention discloses a distinguishing table type X-ray spectrometer and an X-ray absorption spectrum testing method, and relates to the technical field of spectral measurement. The high-resolution table type X-ray spectrometer comprises a sample signal source which is located in a Dowland circle and is used for generating X-rays; the exponential crystal is a bent crystal, the surface shape of the exponential crystal is defined by an exponential equation, so that different points on the curved surface of the crystal have different curvature radiuses and correspond to Rowland circles with different radiuses, each point on the exponential crystal is tangent to the corresponding Rowland circle, and the exponential crystal is used for performing monochromatization and focusing on the X-ray incident from the sample signal source; and the detector is positioned on a surface formed by the corresponding imaging points on each Rowland circle, and is used for receiving the X-rays which are monochromatized and focused by the index crystal and outputting corresponding light intensity signals. Therefore, through the cooperation of the index crystal and the multi-Rowland circle structure, the X-ray absorption spectrum test with high light receiving efficiency, high spectral resolution and wide energy spectrum range can be realized, and the comprehensive performance of the desk type spectrometer is improved.

The invention relates to the technical field of optical filters, and provides an infrared ray gradient optical filter and a preparation method thereof, and the preparation method comprises the following steps: providing a substrate; coating the upper surface of the substrate for the first time to form a first reflecting layer; the upper surface of the first reflecting layer is coated for the second time to form a spacer layer, the cross section of the spacer layer is of a wedge-shaped structure, and the thickness of the wedge-shaped structure is linearly increased in the preset direction; and carrying out third coating on the upper surface of the spacing layer to form a second reflecting layer, thereby obtaining the infrared linear gradual change optical filter. The surface, away from the substrate, of the second reflecting layer is used for receiving incident light, and the surface, away from the first reflecting layer, of the substrate is used for emitting transmission light. And the second reflecting layer is formed by alternately laminating first refractive index material film layers and second refractive index material film layers. The infrared ray linear gradual change optical filter can continuously and dynamically adjust the spectral resolution, and the wavelength application range is wide.

The invention belongs to the field of reconfigurable on-chip spectrometers, and particularly discloses a reconfigurable on-chip spectrometer based on a low-loss GST superlattice phase change material. According to the invention, the GST-SL2 material is combined with the double-cascade micro-ring array architecture, so that the performance of the device is improved in a breakthrough manner, a large amount of spectral response can be generated only through a limited number of micro-ring resonators on a chip, the flexible regulation and control of the spectral resolution and the working bandwidth are supported, and the customization requirements of different application scenes are met; a resolution regulation and control array is formed by cascading # imgabs0 first MRRs which are arranged at equal intervals in the extension direction of a bus waveguide, the lengths of resonance micro-rings of the first MRRs are increased progressively, and due to the cascading design, through the synergistic effect of the multiple MRRs, the overall regulation and control capacity is remarkably enhanced, and it is ensured that sampling points can uniformly cover the whole working bandwidth of an on-chip spectrometer; the measurement bandwidth regulation and control array divides the working bandwidth into a plurality of channels, the irrelevance of a system response function is successfully enhanced, and a reliable basis is provided for spectrum reconstruction.

The invention discloses a filtering adjustment method and system based on an adaptive clock, and relates to the technical field of filtering adjustment, and the method comprises the steps: carrying out the time domain framing processing of a collected input signal through employing a sliding window, and combining DCT and compressed sensing to reconstruct the signal, and the main frequency of the signal and the dynamic change of the main frequency in the time sequence are accurately extracted through FFT, Gaussian pyramid layering and a multi-scale optical flow method, so that the frequency identification capability of the non-stationary signal is effectively enhanced, the frequency spectrum resolution is ensured, the data processing amount is remarkably reduced, the response speed of the signal frequency change is improved, and the method is suitable for popularization and application. Through the main-sub clock structure, the quick response of the center frequency of the filter to the change of the main frequency is ensured, the selectivity of the filter and the signal fidelity are improved, through the compensation adjustment of environmental factors, the influence of temperature and voltage changes on signal processing can be effectively reduced, and the robustness and stability of the system are enhanced.

The invention belongs to the field of nuclear magnetic resonance technology detection, and particularly relates to a detection method for sodium ions in an ion exchange membrane and application. The detection method comprises the following steps: (1) soaking an ion exchange membrane to prepare a polygonal sample with a symmetrical structure and no less than 4 edges, winding the sample on a uniform bar, loading the sample into the bottom of a nuclear magnetic tube by adopting a screw-in manner, and drawing out the bar or retaining the bar in the nuclear magnetic tube; (2) putting the nuclear magnetic tube prepared in the step (1) into a nuclear magnetic resonance spectrometer, tuning, shimming, adjusting nuclear magnetic resonance test parameters, and collecting signals; the nuclear magnetic resonance test parameters comprise that the 90-degree pulse width is 10-14 [mu] s; and the power is 60 to 110W. The nuclear magnetic sample prepared by the method has the advantages of good shimming effect, high detection sensitivity, high spectrogram resolution and the like during detection, and 23Na in a bulk phase of an ion exchange membrane can be detected.

The invention discloses a one-dimensional ultra-wide field-of-view ultra-high spectral resolution dispersion coherent imaging spectrometer, which belongs to the technical field of spectral imaging, and comprises a first microlens array used for obtaining incident light of a one-dimensional ultra-wide field-of-view in a horizontal plane; the plurality of optical fibers are used for transmitting incident light of a one-dimensional ultra-wide field of view; the second micro lens array is used for collimating incident light from each optical fiber into broadband parallel light beams; the grating beam splitter interferometer is used for dispersing the broadband parallel light beams into a plurality of narrow-band parallel light beams with different propagation directions; the cylindrical lens is used for converging the two paths of coherent light of each narrow-band parallel light beam to a target block of the detector, and converging the narrow-band parallel light beams with different propagation directions to different target blocks respectively; and the detector is used for obtaining a continuous broadband ultra-high resolution spectrum according to the two paths of coherent light received by each target block. According to the invention, a one-dimensional ultra-wide field of view is obtained in a horizontal plane, and ultra-high spectral resolution can be obtained.

The invention provides an anti-noise interference frequency parameter estimation method for high-precision optical coherence ranging, which comprises the following steps: acquiring a spectral interference signal of an optical low-coherence interference system and a reference light spectral signal output only by a reference arm, and converting the spectral interference signal into interference signals with wave number space arranged at equal intervals, carrying out spectral density amplitude normalization to obtain a standard interference signal so as to eliminate interference of light source spectrum fluctuation and non-uniform sampling on frequency estimation; hanning window modulation is applied to a standard interference signal, spectrum leakage is suppressed, spectrum analysis is performed on the modulated signal, a peak value and an adjacent secondary peak value of a spectrum main lobe are extracted, a frequency correction amount is calculated based on a peak value and secondary peak value amplitude ratio relation derived by a Hanning window spectrum mode function, and an accurate frequency of the interference signal is obtained; and calculating the displacement of the object to be measured according to the product of the accurate frequency and the spectral resolution of the optical low-coherence interference system in combination with the refractive index of the light in the measurement medium.

The technology provides a method and apparatus for standardizing spectral resolution across multiple spectrometers using custom input slit dimensions. A plate with a slit may be replaced to provide various slit widths to obtain desired spectrometer resolution. Alternatively, the plate may include an adjustable slit width that is mechanically adjusted over a desired range of values. The slit width may be adjusted by discrete increment amounts determined based on an end application. A resolution of a tunable spectrometer may be calibrated to match a reference spectrometer by customizing a slit width value. The technology enhances the accuracy of spectral classification algorithms by minimizing variability of Raman spectra introduced by spectrometer component differences in lenses, gratings, and detectors, for example.

The invention, which belongs to the technical field of spectral imaging, discloses an ultra-wide-band ultra-wide-field-of-view high-spectral-resolution real-time imaging spectrometer comprising a first micro-lens array, a plurality of optical fibers, a plurality of second micro-lens arrays and a plurality of assemblies. First micro lenses in each column of the first micro lens array are arranged on a vertical plane arc, and micro lenses in each row are arranged on a horizontal plane straight line, so that incident light of a one-dimensional ultra-wide view field is obtained in real time; through optical fiber coupling, incident light is transmitted to the second micro lens array to be collimated into parallel light beams; according to the components, light of different wavebands is processed through the optical filter, the plane transmission grating and the detector, first-order diffraction light beams of different wavelengths in the different wavebands are received by the detector after diffraction, and space information and spectral information are obtained in real time according to an irradiated target block. The imaging spectrometer provided by the invention has the advantages of ultra-wide wave band, ultra-wide field of view, high spectral resolution, real-time measurement, compact structure and high stability, and is suitable for a remote sensing photoelectric reconnaissance detection system.

The application discloses a hyperspectral imaging chip, device and system based on an adjustable reconfigurable metasurface, and the chip comprises a metasurface unit array, a metasurface reconfiguration module, a metasurface adjustment module, a CMOS image sensor and a spectrum reconstruction and identification module, the metasurface unit array comprises a plurality of metasurface units arranged on a silicon layer; the metasurface reconfiguration module is used for adjusting the number of metasurface units included in the reconfigurable metasurface unit array; the metasurface adjustment module is used for connecting the silicon layer of the metasurface unit array through wires, and is used for changing the spectral response of the metasurface unit by adjusting the voltage of the wires; the CMOS image sensor is used for detecting light signals from the reconfigurable metasurface unit array after modulation; and the spectrum reconstruction and identification module is used for performing hyperspectral reconstruction and imaging according to the light signals detected by the CMOS image sensor. The application has adjustable spectral response, ultrahigh spectral resolution, real-time dynamic monitoring capability and self-adaptive imaging capability.

The invention discloses a spectral imaging calculation system based on spectral response enhancement of a color detector, and belongs to the technical field of spectral imaging, the spectral imaging calculation system comprises a birefringence light splitting module and a color detector, the birefringence light splitting module comprises a polarizer, a birefringence crystal and a polarization analyzer, the polarizer, the birefringent crystal, the polarization analyzer and the color detector are sequentially and coaxially arranged along an optical axis; the color detector is also electrically connected with a signal processing module; incident light is converted into linearly polarized light through the polarizer, the linearly polarized light is decomposed into o light and e light through the birefringent crystal, and the o light and the e light are combined into emergent light through the polarization analyzer. The emergent light passes through a color detector to obtain a measurement signal; and the signal processing module receives the measurement signal and reconstructs a spectral image in combination with the spectral response matrix of the birefringence light splitting module and the spectral response function of the color detector. The spectral response characteristics of multiple color channels of the color image sensor are combined with the birefringence color development polarization principle, the rank of a spectral response matrix is expanded, and the spectral resolution and the imaging precision are improved, so that the spectral information of a substance is more accurately acquired and analyzed.

The invention discloses a fluorescence detector based on an off-axis parabolic mirror, and belongs to the technical field of liquid chromatographic analysis, the fluorescence detector comprises a light source light path, an excitation monochromatic light path, a flow cell light path, a fluorescence collection light path, a fluorescence emission light path and a detector which are arranged in sequence, and the light source light path generates and converges ultraviolet-visible light; the converged ultraviolet-visible light is converted into monochromatic light with different wavelengths through the monochromatic light excitation path, the monochromatic light irradiates a to-be-detected sample in the flow cell light path to generate fluorescence, the fluorescence collection light path collects and converges the fluorescence, the converged fluorescence is divided into monochromatic fluorescence with different wavelengths through the fluorescence emission light path, and the monochromatic fluorescence is finally detected by the detector. The light source light path and the fluorescence collection light path both adopt off-axis parabolic reflectors to replace lenses, so that the influence of chromatic aberration is eliminated, and the utilization rate of optical energy is improved; the two off-axis parabolic reflectors are matched with each other, so that high spectral resolution is realized, and a simulation imaging light spot is less than 20 microns.

The invention discloses an on-orbit spectrum precision test method and equipment for an ultraviolet hyperspectral remote sensor, and the method comprises the steps: selecting a high-resolution reference solar spectrum higher than the spectral resolution of the ultraviolet hyperspectral remote sensor, and calculating a reference standard solar spectrum according to the high-resolution reference solar spectrum; establishing a reference wavelength library according to the reference standard solar spectrum of the ultraviolet band, and selecting a standard absorption line meeting conditions as a reference wavelength; screening an absorption peak center position of the observation spectrum, finding an absorption peak center closest to the reference wavelength in combination with the reference wavelength library, and constructing a peak searching database of the absorption peak center of the discrete spectrum; and calculating a difference value between the central wavelength calculated according to the peak searching database and the corresponding reference wavelength to obtain the spectrum calibration precision of the ultraviolet hyperspectral remote sensor. According to the method, the precision difference of the spatial dimension can be identified, the distribution of the overall system deviation is quantified, and reliable support is provided for on-orbit precision verification and performance optimization of the ultraviolet hyperspectral remote sensor.

The invention discloses a spectral space coding imaging system and method of a programmable diffractive optical element. The method comprises the following steps: S10, receiving a target scene light signal through a light field model and forming an optical image; s20, performing spatial spectrum joint modulation on the optical image by adopting a programmable diffractive optical element to obtain a coded light field; s30, projecting the coding light field to a detector and obtaining a two-dimensional coding image of primary exposure; and S40, inputting the two-dimensional coding image into a reconstruction module, combining modulation information of the programmable diffractive optical element, and performing decoding reconstruction by using a compressed sensing algorithm to obtain a high-resolution space image and spectral information of the scene. According to the invention, the limitation of the existing system on spatial / spectral resolution is broken through, the system structure is simplified, and the hardware programmability is improved; the imaging capability in a dynamic scene is improved; the signal-to-noise ratio and the penetrating power are improved; and balancing a physical model and a data driving method.

The invention discloses a millimeter wave scattering aperture sparse three-dimensional imaging method and a millimeter wave scattering aperture sparse three-dimensional imaging system, and aims to realize high-resolution three-dimensional reconstruction through a sparse reconstruction algorithm aiming at a non-vision field target imaging problem under a rough scattering surface condition. The method comprises the following steps: firstly, improving the spectral resolution of an echo signal by using a time domain zero padding technology, accurately positioning a scattering aperture position based on spectrum peak estimation and completing distance compensation, converting a non-vision field echo into an equivalent vision field echo, and retaining complete information of a target; secondly, in combination with target space scattering point sparsity and scattering aperture sparse sampling characteristics, a virtual array and a measurement matrix are constructed, an imaging problem is converted into a sparse reconstruction task, and a target scattering coefficient is efficiently solved by adopting a generalized orthogonal matching pursuit algorithm; the dependence on a mirror reflection condition is broken through, and a non-vision target can be accurately reconstructed in a diffuse reflection scene; compared with an existing scattering aperture algorithm, the method has the advantage that the imaging resolution and the anti-noise capability are remarkably improved through double sparsity constraints. The method has important application value.

The invention provides an optical frequency domain reflectometer grating array multiplexing demodulation method based on peak position estimation, and the method comprises the steps: in quasi-distributed sensing based on optical frequency domain reflectometer grating array multiplexing, in order to obtain an acceptable grating spectral measurement resolution ratio, carrying out peak position estimation; in the prior art, dense interpolation needs to be carried out on a spectrum of which the spectral resolution is lower than a threshold value required by demodulation, but the data volume is greatly increased, so that the calculation rate is slowed down, and the demodulation efficiency is low. According to the method, peak position estimation is carried out on the cross-correlation spectrum of the grating spectrum of which the spectral resolution is lower than the threshold required by demodulation, so that dense interpolation is avoided, and the problem of low demodulation efficiency caused by dense interpolation is improved; meanwhile, in order to overcome the problems of spectrum distortion caused by grating inscribing defects and spectrum splitting caused by gaps between gratings in the traditional demodulation process, the robustness of system demodulation is ensured to the maximum extent on the basis of improving the system demodulation efficiency.

The invention provides a Raman spectrum calibration method and system based on transient stimulated Raman scattering. The Raman spectrum calibration method comprises the following steps: acquiring stimulated Raman signals in a time domain in a transient stimulated Raman scattering mode; the time delay of each sampling point of the time domain Raman signal is tracked in real time through the reference laser interference fringes, and Raman displacement after Fourier transform is determined; detecting an exciting light spectrum obtained by sampling through a photoelectric detector, and calculating excitation efficiency at different Raman displacement positions to obtain an excitation efficiency curve; the intensity of Raman spectrums at different Raman displacement positions is calibrated through the excitation efficiency curve, the self-calibrated Raman spectrums are obtained, the self-calibration transient stimulated Raman scattering technology inherits the advantages of high time resolution and high spectral resolution of the transient stimulated Raman scattering technology, the self-calibration transient stimulated Raman scattering technology is combined with a self-calibration mechanism, and the self-calibration effect of the self-calibration transient stimulated Raman scattering technology is improved. The influence of excitation light fluctuation is eliminated, the Raman spectrum measurement accuracy and repeatability are remarkably improved, and the quantitative analysis capability is comparable to that of spontaneous Raman spectrum.

The invention discloses a system for measuring high-temperature infrared emissivity of a solar heat collector, which relates to the technical field of emissivity measurement and is technically characterized in that the system realizes uniform distribution of surface temperature of a sample through a micro-nano structure solar heat collection heating module, and covers a high-temperature range of 100-1200 DEG C in combination with PID temperature control and a rotating platform; an optical chopper is used for modulating the frequency of an optical signal, and a lock-in amplifier is combined to extract a weak signal, so that the signal-to-noise ratio is improved to 105 magnitude, and radiation intensity detection as low as 10 <-3 > W / cm < 2 >. Sr. Mu m is supported; the system also ensures that the standard radiation module realizes traceability transmission of temperature and radiation intensity by periodically calibrating the standard black body and the auxiliary black body, and ensures that the measurement error is less than or equal to + / -1%; the Fourier infrared spectrometer covers the wave band of 0.8-25 microns, a beam splitter and a refrigeration type detector are combined, the spectral resolution reaches 0.5 cm <-1 >, and complex spectral characteristics at high temperature can be accurately analyzed.

The application belongs to the field of spectral measurement and imaging, and specifically discloses a single-photon detection device and a rapid spectral and imaging system based on the same. According to the application, a transmission optical fiber spectrometer separates each waveband complex light according to wavelength in space, and couples the photons of different wavelengths into an optical fiber array for time delay, so that the different wavelengths are delayed to different time points and output to a single-photon detection device. The single-photon detection device converts the photons of different wavelengths arriving at the device in time sequence into electrical signals, and obtains the number of photons at different time points after amplification and signal processing, and converts the number of photons into a spectrum. Since the transmission spectrometer can provide higher diffraction efficiency, higher spectral resolution and signal strength, the single-photon detection device can provide a faster and more accurate photon discrimination and photon counting method, and compared with the prior art, the whole can measure the spectrum more quickly, and has higher spectral resolution and signal strength.

The invention provides an adaptive reconfigurable metasurface array multiplexing method based on a detection signal-to-noise ratio, and relates to the technical field of spectral imaging, and the method comprises the steps: for each superpixel unit, calculating the detection signal-to-noise ratio of the superpixel unit based on a signal inputted to the superpixel unit; based on a comparison result of the detection signal-to-noise ratio of the super-pixel unit and at least one preset signal-to-noise ratio threshold value, determining a scale adjustment mode for the super-pixel unit; based on the scale adjustment mode for each superpixel unit, generating a reconstruction instruction, and distributing the reconstruction instruction to each metasurface; the reconstruction instruction is used for indicating the adjustment of the resonance characteristic of the super-surface so as to realize the scale adjustment of the super-pixel unit. According to the method, the superpixel scale can be automatically adjusted according to different signal-to-noise ratios of input signals, so that the optimal distribution of the spectral resolution and the spatial resolution under different input signal-to-noise ratios is realized.

This application discloses a hyperspectral imaging method, electronic device, hyperspectral imager, and computer-readable medium based on a hyperspectral imaging module. The hyperspectral imaging module includes a light source, an optical imaging system, a spectral chip, and a photodetector. The spectral chip includes multiple spectral resolution units, each of which includes multiple cascaded active tunable spectral units and a phase modulator disposed on each active tunable spectral unit. Phase modulation parameters are determined for each phase modulator according to a preset spectral resolution method. Each phase modulation parameter is sent to the corresponding phase modulator. A driving signal is sent to the light source. Hyperspectral imaging data is obtained by resolution based on the electrical signal sent by the photodetector and the preset spectral resolution method. This method can not only reduce the cost and size of the hyperspectral imager, but also improve its resolution, reduce the computational complexity of the hyperspectral imager, and improve the real-time performance of data processing.

The application discloses a kind of broadband fiber spectrometer based on phase modulation, including polarization maintaining optical fiber, fiber collimator A, phase modulation device, fiber collimator B, multimode optical fiber, CCD image sensor and computer that are sequentially arranged, fiber collimator A is set to the light outlet of polarization maintaining optical fiber, phase modulation device carries out phase modulation to the incident light from fiber collimator A, fiber collimator B is set to the light inlet of multimode optical fiber, the light outlet of multimode optical fiber is aligned with CCD image sensor, and CCD image sensor is electrically connected with computer.The application uses the above structure to overcome the problem that spectrum resolution and measurement bandwidth are mutually restricted in fiber spectrometer.

The invention provides an F-P spectral imaging system and method, and belongs to the technical field of spectral component measurement, and the system comprises a front lens which is used for collecting light energy and converting the light energy into emergent light meeting the limitation of the clear aperture of an F-P interferometer; the annular band optical filter comprises a central area and a plurality of concentric annular areas surrounding the central area, the bandwidth of each area is the same as the free spectral range of the F-P interferometer, and the annular band optical filter is used for eliminating level aliasing in emergent light of the front lens; the F-P interferometer is used for carrying out wavelength selection on emergent light of the annular band optical filter and outputting an interference field; the imaging mirror is used for projecting the interference field to the detector; and the detector is used for converting the projected optical signal into a digital electric signal. The F-P spectral imaging system which can maintain high spectral resolution and also can realize wide spectrum coverage is constructed by introducing the annular band optical filter which is accurately matched with the FSR of the F-P interferometer.

An exemplary sound processor is configured to direct a cochlear implant to apply standard electrical stimulation representative of frequencies in an audio signal that are within an upper region to a cochlea of a first ear of a recipient by way of a plurality of electrodes in accordance with a frequency allocation table that maps frequencies in the upper region of the audible frequency range of the recipient to the plurality of electrodes, the upper region of the audible frequency range comprising frequencies above and including a cutoff frequency, and direct the cochlear implant to apply electrical stimulation representative of frequencies in the audio signal that are within a lower region of the audible frequency range to the cochlea of the first ear by way of a most apical electrode and one or more compensating electrodes included in the plurality of electrodes in accordance with an electrode stimulation configuration.

The present invention relates to a rotating multi-structure spectrometer and a design method thereof, belonging to the field of spectral measurement technology. The design method comprises the following steps: determining optical system design indicators of the rotating multi-structure spectrometer; determining a detector based on the spectral range and spectral resolution; using a parabolic reflector as a collimating lens group; selecting a plane transmission grating as a light splitting device and determining the incident angle of the plane transmission grating; calculating the wavelength range and central wavelength corresponding to each structure position based on the number of preset structure positions, the spectral range, and the spectral resolution, determining the relative position of each structure position, and deriving an equation representing the axial chromatic aberration between different wavelengths at each structure position; and performing wide-band chromatic aberration correction based on the achromatic aberration equation within each wavelength band and the derived equation representing the axial chromatic aberration between different wavelengths at each structure position. The present invention enables the spectrometer to have both a wide spectrum and high resolution, thereby improving spectral measurement efficiency and reducing measurement costs.

The invention discloses a high-performance ultraviolet visible light hyperspectral imaging system and an adjustment method thereof, and belongs to the technical field of spectral imaging, in the system, a front mirror assembly comprises a front primary mirror assembly, a front secondary mirror assembly, a front three-mirror assembly and a folding-axis mirror assembly; light enters through the incidence assembly, is reflected by the primary mirror assembly, the front secondary mirror assembly, the front three-mirror assembly and the folding-axis mirror assembly in sequence, enters the optical slit, and then enters the grating through the optical filter, the prism, the first rear mirror, the second rear mirror and the third rear mirror in sequence. And after being dispersed and reflected by the grating, the light sequentially passes through the rear mirror 3, the rear mirror 2 and the rear mirror 1, enters the prism, and reaches an imaging image surface after being reflected by the prism. According to the invention, high-reflectivity detection of an ultraviolet band can be realized, high-resolution detection of an ultraviolet visible spectrum of 280-1000 nm can be realized, and the highest spectral resolution of 0.5 nm can be realized; the imaging quality is close to the diffraction limit, plug and play is achieved, and the light and small layout has engineering applicability.

The invention relates to the technical field of differential absorption spectrum inversion, and discloses an ozone precursor monitoring method and system based on a two-channel differential absorption spectrum and nonlinear inversion, a terminal and a storage medium, the method comprises the following steps: synchronously obtaining a target spectrum and a reference spectrum of a target area to calculate a multiband atmospheric differential optical thickness; building a combination model based on the difference optical thickness of each wave band, dividing a fitting window, and obtaining the difference inclined column concentration through multi-angle fitting; and inverting a vertical concentration distribution profile of the ozone precursor by using different sensitivities in combination with a radiation transmission model and a logarithmic space iterative inversion algorithm. According to the invention, through a high-performance dual-channel spectrometer observation system and a high-precision nonlinear inversion algorithm, high-spectral-resolution measurement of ultraviolet-visible light full wavebands is realized, logarithmic space processing is introduced in inversion, the inherent problems of strong nonlinearity and large dynamic range of a vertical profile of aerosol and trace gas are effectively solved, and the measurement accuracy is improved. And the measurement precision and stability are improved.

Hyperspectral and multispectral cameras are unique from conventional cameras in that they are configured to capture and separate the light from a scene into its individual wavelengths or spectral bands. Conventional cameras, on the other hand, capture three-channel color information, i.e., the intensity of red, green and blue colors. Currently, hyperspectral / multispectral cameras are expensive scientific devices (i.e. not built from off the shelf components), thus limiting the availability to the general population. Furthermore, the currently available designs of hyperspectral / multispectral cameras tend to make trade-offs between three quantities: spectral resolution, spatial resolution, and the time to acquire an image, such that improving one area negatively impacts the others. The present disclosure provides a hyperspectral or multispectral type camera, which can be built from off the shelf components, and that is configured with compressive sensing, which can alleviate at least part of the three-way design tradeoff present in current hyperspectral camera designs.