193 results about "Spectral resolution" patented technology

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 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 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 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 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 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.

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.

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.

The present application relates to a kind of based on micro-nano fiber and scattering medium substrate coding element and speckle spectrometer.The coding element includes sealed cavity, micro-nano fiber and scattering medium substrate;Including drawstring transition zone and waist zone in the body of micro-nano fiber, drawstring transition zone forms leaky mode, waist zone generates evanescent field, the body of micro-nano fiber penetrates sealed cavity, so that drawstring transition zone and waist zone are located in sealed cavity;Scattering medium substrate is fixed in sealed cavity, and the waist zone of micro-nano fiber is overlapped on scattering medium substrate, scattering medium substrate is used to receive evanescent field and is coupled leaky mode to obtain scattering pattern information;Wherein, in the direction parallel to waist zone, scattering medium substrate includes more than two scattering zones, and the light transmittance of each scattering zone is different, and the difference between maximum light transmittance and minimum light transmittance is 20%~80%.Speckle spectrometer using the coding element of the present application has the advantages of small size, low cost while high spectral resolution.

The present application relates to the technical field of measurement, in particular to a kind of spectrometer automatic calibration device and method, comprising: light source, optical isolator, fiber coupler, standard reference light source, adjustable fiber attenuator, first fiber collimator, holographic frequency selection module, electric reflector, volume holographic grating, second fiber collimator, beam splitter, optical interface unit, to be measured spectrometer, photoelectric detector, electric reflector driver, angle-second level angle encoder, control module, communication module, computer and image display unit.The present application utilizes volume holographic grating to select the corresponding relationship between the pixel of spectrometer and wavelength, can continuously select monochromatic light, and the theoretical resolution is consistent with the spectral resolution of light source;Using automatic calibration method, the automatic calibration of spectrometer is realized, pixel-wavelength calibration data can be automatically generated and stored in preset format, which is convenient for automatic calibration and data processing of spectral measurement software, and realizes wavelength-pixel position registration at pixel level.

The application discloses a kind of full polarization spectral imaging device and detection method, contain sequentially arranged polarization modulator, imaging spectrometer, data acquisition processing display system to incident light;Polarization modulator is single fixed retarder and single fixed linear polarizer sequentially arranged along incident light, can carry out spectral modulation to full stokes parameter, it has the superiority of simple, ultra-compact, miniaturization, anti-system error in structure.By constructing complete imaging physical model or constructing imaging physical model based on compressed sensing, then using untrained artificial neural network realizes the full stokes parameter image reconstruction under each narrow waveband, and the deep neural network of "black box operation" is endowed with physical meaning.The reconstructed polarization spectral resolution can be consistent with the resolution of the imaging spectrometer used;And it has the characteristics of strong anti-noise ability, so as to ensure high-quality reconstruction.

The present application belongs to the technical field of computer data processing, and provides a biodiversity inversion method based on multi-source remote sensing image fusion, comprising: 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; the present application realizes differentiated fusion of high and low frequency components under different scales through wave base adaptive selection and multi-scale wavelet decomposition, taking into account spectral fidelity and spatial structure preservation, improves the complementarity of multi-source data and the quality of fused images; through spectral resolution refinement processing and multi-bandwidth scale simulation, the limitation of single resolution is broken through, and the ability to capture complex spectral features of vegetation is enhanced; through spatial neighborhood feature fusion, spatial correlation is enhanced; through the ecological variable inversion estimation model, multi-index synchronous prediction is realized, and the generality of the model is improved.

The utility model relates to a portable infrared dual-spectrum imaging target detection device, comprising a housing, the housing comprises a front housing, a rear housing and a rear cover, the front housing comprises an objective lens group and a filter device group, the filter device group automatically switches multispectrum and hyperspectrum and rapidly changes spectral resolution, the objective lens group is provided with an optical filter I, and the rear housing is provided with an optical filter II; converting an infrared signal of a convergence target into parallel light, and transmitting the parallel light to the light filtering device group to generate a narrow-band spectrum; the rear shell comprises a rear optical group, a detector group and a data processing group, the rear optical group receives the narrow-band spectrum and focuses the narrow-band spectrum to a designated position, the detector group receives an optical signal and converts the optical signal into an electric signal, and the data processing group collects the electric signal; the rear cover comprises a display output group for displaying the target feature image in real time; a power pack is arranged at the bottom of the shell and used for supplying power; a wrist strap is arranged on the side face of the shell and used for stably holding the equipment. The device has the advantages of being small in size, low in manufacturing cost, wide in application scene and convenient to operate, and can be applied to application scenes such as identification of solid targets, gas targets and multi-gas mixed targets.

This application relates to the field of optical polarization measurement technology, specifically to a wide-spectrum, high-bandwidth static spectral modulation Stokes polarization measurement device, comprising a polarization modulation module, a spectral sampling module, and a high extinction ratio polarizer. The polarization modulation module includes a phase retarder and a linear polarizer; the spectral sampling module has sub-nanometer spectral resolution; the high extinction ratio polarizer includes a halogen tungsten lamp and a Glan Taylor prism for generating high-purity linearly polarized light; the obtained demodulation factor and the modulation spectrum acquired by the spectral sampling module are used to invert the Stokes parameters using zero-heterodyne coherent demodulation technology. This application employs a phase retarder with high birefringence, which, for the same thickness, produces an optical path difference tens of times greater than that of quartz, increasing the Stokes polarization measurement bandwidth by a factor of the response and improving the measurement accuracy of polarization spectral parameters. Simultaneously, the zero-heterodyne coherent demodulation method is used to eliminate the dispersion interference of the phase retarder through calibration.

The invention relates to the technical field of hyperspectral remote sensing spectral analysis, in particular to a full-spectrum splicing high-resolution imaging system and method for a hyperspectral analyzer, and the method comprises the steps: determining a slit switching sequence through an acquisition module; the dynamic collimation module feeds back an aberration result; the adaptive dispersion module carries out wavelength calibration; the high-precision imaging module predicts imaging mirror parameters; the real-time compensation module adopts a Kalman filtering algorithm to predict the defocus compensation amount and executes nanoscale displacement compensation through a piezoelectric ceramic driver; the intelligent splicing module adopts an SIFT feature matching algorithm, a generative adversarial network and a reinforcement learning algorithm to realize image registration and fusion; the cooperative control module generates control signals through Monte Carlo simulation and a Bayesian optimization algorithm to coordinate all the modules. According to the invention, the problems of insufficient spectral resolution, difficulty in data splicing and low real-time measurement efficiency caused by fixed hardware parameters in a wide-spectrum spectral imaging system are solved, and full-spectrum high-resolution imaging is realized.

The application discloses an echo cancellation method and system based on a heterogeneous multi-scale convolutional recurrent network, which first constructs a correlation encoder based on the extraction of relevant feature patterns in multiple frames of context, then constructs a spectral encoder according to the extraction of spectral patterns in a single frame, and then adopts the correlation encoder and the spectral encoder to form a heterogeneous multi-scale encoder and obtain multiple paths of encoded features; the application realizes the function of extracting different features from the input mixed signal spectrum and the reference signal spectrum by using the heterogeneous dual-path encoder, adopts correlation coding to adapt to the time delay between the reference signal and the mixed signal, and extracts correlation feature expressions from multiple frames of spectrum, simultaneously adopts spectral coding to extract spectral pattern expressions from the current frame in order to strengthen the spectral resolution of the current frame, and realizes the function of further adopting a channel attention feature soft selection mechanism to fuse the correlation feature coding and the spectral coding for the dual-path features, and is suitable for being widely promoted and used.

The invention discloses a polar axis type solar direct radiation spectrum measurement method and system, belongs to the technical field of solar direct radiation spectrum measurement, and aims to solve the problems that an existing measurement system depends on complex double-axis tracking, has many errors, is high in maintenance cost and is insufficient in latitude adaptability. The system comprises a polar axis rotating reflector and a solar spectrum measurement system, the polar axis rotating reflector directly radiates and reflects the sun with the solar elevation angle of + / -23.5 degrees and the solar azimuth angle of + / -90 degrees to the measurement system, and measurement is achieved in combination with a spectrum reconstruction model. The spectral resolution is superior to 2 nm, the single-point error ranges from-6.83% to 6.61%, the area error ranges from-0.03% to 0.05%, the space-time uniformity is larger than or equal to 99.92%, the structure is simplified, all-year-round all-latitude high-precision measurement without moving tracking is achieved, and the method is suitable for the fields of solar energy development, climate change research and the like.

The invention provides an image sensor, a camera module and electronic equipment, and relates to the field of camera and electronic products. The image sensor comprises a micro lens array, a filtering array, a super surface layer and a plurality of photodiodes, the light filtering array and the micro lens array are oppositely arranged, and the light filtering array comprises a plurality of light filters; the metasurface layer comprises a plurality of micro-nano structures, the plurality of micro-nano structures and the plurality of optical filters are arranged in a one-to-one correspondence manner, and at least two micro-nano structures are different in size; the plurality of photodiodes are arranged on one side, deviating from the filtering array, of the metasurface layer, and the plurality of photodiodes and the plurality of micro-nano structures are arranged in a one-to-one correspondence manner. The number of spectral channels can be increased, the spectral resolution of the image sensor can be improved, and the multi-spectral imaging requirement is met.

This invention relates to the field of imaging spectrometer technology and discloses an imaging spectrometer assembly and adjustment method. The method includes: installing an auxiliary assembly and adjustment slit assembly at the spectrometer slit assembly mounting position; coarsely adjusting the detector using a first adjustment device to obtain a first position range that meets the first coarse adjustment conditions; successively adjusting the detector position within the first position range using the first adjustment device; after each adjustment, illuminating the auxiliary assembly and adjustment slit assembly with beams of different wavelengths using a monochromatic light source to form a slit image on the detector; determining the spectral resolution of the current detector position in the first preset field of view based on the response value of the slit image in the first preset field of view during each wavelength illumination; and determining the fixed position of the detector based on the spectral resolution of each wavelength in the first preset field of view. This invention enables quantitative optimization of spectral resolution and improves assembly and adjustment accuracy.

This invention provides a novel scanning laser wind-measuring radar, employing a high-stability, narrow-linewidth semiconductor laser as the transmitting device. A high-speed optical switch precisely modulates the continuous laser in the time domain to generate ideal laser pulses. High-power amplifiers and low-noise amplifiers are used to enhance the transmitted power and echo signal quality, significantly compensating for the decrease in atmospheric echo power and improving range resolution and wind speed accuracy. The high-stability, narrow-linewidth laser improves the signal-to-noise ratio through a triple mechanism of increased coherence efficiency, reduced background noise, and sharpened spectral resolution, enabling long-range detection. When using a transceiver telescope system, it avoids a reduction in the scanning field of view due to a decrease in signal-to-noise ratio. The semiconductor laser solution is lighter than fiber lasers, suitable for airborne platforms, and enables miniaturized laser wind-measuring radar equipment. Furthermore, the high-stability, narrow-linewidth semiconductor laser used meets temperature and vibration stability requirements, ensuring the long-term reliability of the wind-measuring radar in field environments.

The invention relates to the technical field of sensors, in particular to a spectrum sensor which comprises a tube base, a tube cap, an MEMS carrier plate, a first light splitting chip, a second light splitting chip, a spectrum detector, a band-pass optical filter and pins, the tube cap is arranged on the tube base, the tube cap and the tube base form a mounting cavity, the MEMS carrier plate is arranged on the tube base, the first light splitting chip is arranged on the MEMS carrier plate, and the second light splitting chip is arranged on the spectrum detector. The first light splitting chip is horizontally arranged on the MEMS carrier plate through a first supporting structure, the second light splitting chip is horizontally arranged on the first light splitting chip through a second supporting structure, and the second light splitting chip and the first light splitting chip are arranged on the same vertical central axis. Different driving voltages are respectively applied to the second light splitting chip and the first light splitting chip to form spectrum transmission peaks at different positions, and a superposition filtering principle is adopted, so that the resolution of a spectrum reaching the position of a spectrum detector is improved, and the resolution of the spectrum sensor is effectively improved.

This invention discloses an FPGA-based F-P etalon length tilt adjustment method and device. It performs layered adjustment of "X and Y direction parallelism adjustment" and "Z direction cavity fixing," relying on an FPGA to construct a two-level priority scheduling mechanism with fixed underlying hardware. Utilizing the parallel processing advantages and nanosecond-level clock determinism of FPGA hardware logic, the X and Y direction parallelism determination is fixed as the highest hardware priority. In each control iteration, the FPGA performs threshold comparison with low latency. If the parallelism does not meet the standard, the system intercepts the Z-direction cavity fixing command within a deterministic control cycle and prioritizes the leveling branch. This "software algorithm hardwareization" strategy effectively suppresses multidimensional cross-coupling oscillations. The adjusted etalon achieves the theoretical peak transmittance and spectral resolution, and the area array detector exhibits a sharp interference ring with good contrast.

The application discloses an equal-wavenumber division waveband noise reduction method for an infrared Fourier transform spectrometer, and is applied to fine spectral detection with wide spectral range and ultrahigh resolution. When designing a low-temperature infrared Fourier transform spectrometer, a low-temperature filter wheel is arranged in an optical path in front of a detector, and the low-temperature filter wheel is driven by a low-temperature motor. A plurality of filters are arranged on the filter wheel, the central wavelengths of the filters are different, the central wavelength intervals are different, the central wavelengths and the bandwidths of the filters are designed according to equal central spectral intervals, each filter has a narrow bandwidth, and according to a spectral range of a required detection target, a corresponding filter is selected to realize spectral detection with ultrahigh spectral resolution of a concerned spectral range. For the infrared Fourier transform spectrometer with high spectral resolution and wide spectral bandwidth, the measurement brings the advantage of reducing noise caused by out-of-band photons on the detector, and low temperature of the filter reduces infrared background and photon noise caused by the filter body.

The application discloses a power transformer fault sound print detection method based on an extreme learning machine, first, audio signals of transformer faults are collected for framing, and preprocessed through fast Fourier transform; then, sound print characteristic parameters of the audio signals are extracted through an improved Mel filter, a fault sound print detection model based on the extreme learning machine is constructed, and model training is conducted; finally, a test set is established, real-time test samples are input into the trained fault sound print detection model, test identification is conducted, sound print identification results of transformer faults are obtained, and real-time fault sound print early warning is realized. The improved Mel filter can improve the spectral resolution of transformer sound print feature extraction, reduce the system complexity, the fault sound print detection model is constructed through the extreme learning machine algorithm, the transformer fault detection accuracy is effectively improved, and the method is easy to implement in engineering.