142 results about "Spectral line" patented technology

The invention discloses a correction method for saturation spectral line intensity in a laser spectrum, and relates to the technical field of spectral data analysis, the method comprises the following steps: identifying saturation characteristics in the spectrum, determining a saturation point based on an intensity threshold, and recording the original intensity of the saturation point; determining a target spectrum peak wavelength range containing a saturation point; eliminating saturation points from the wavelength range of the target spectrum peak, and retaining unsaturation points; fitting the unsaturated point through a nonlinear function to obtain the maximum fitting strength; if the maximum fitting strength is lower than the original strength, performing strength correction by adopting a linear extension mode by taking an unsaturated point as a reference, and otherwise, performing strength correction directly based on a fitting model; and outputting the corrected spectral intensity data, and calculating the maximum intensity of the spectral peak and the integral area of the spectral peak. According to the method, the accuracy of saturation judgment and the reliability of a correction result are improved, and a direct intensity data basis and core derivative parameters are provided for quantitative analysis.

The invention discloses a feature extraction method and system based on heterogeneous multi-modal information fusion, and the method comprises the steps: constructing a spectrum reference system through synchronously collecting the data of an image sensor, a laser radar and an infrared spectrometer carried by an unmanned plane, achieving the unified calibration of image data, and generating a unified image reference through employing a feature field fusion technology; extracting multi-modal characteristic spectral lines, performing complementary analysis to confirm fusion characteristics, and establishing a dynamic weight table by matching working frequency bands; a separation factor is generated based on correlation analysis of a point cloud density field and a modal characteristic spectral line, a correction coefficient is generated in combination with characteristic fluctuation analysis, and a pure visual characteristic signal is identified; a mapping transformation kernel is constructed to realize standardized conversion of feature data, a migration coefficient is generated through spatial positioning analysis and feature intensity analysis, a regulation and control instruction is generated through multi-level feature processing, a weight table is adjusted based on the regulation and control instruction to form closed-loop optimization, a hierarchical feature extraction signal is generated, and deep fusion and intelligent extraction of features are realized.

The invention relates to the field of mining laser gas detection, in particular to a modulation and demodulation method and system for carrier noise suppression, and the modulation and demodulation method comprises the following steps: S1, generating a driving current sequence through a laser gas sensor; s2, collecting a light intensity sequence to carry out data reconstruction; s3, extracting a harmonic signal, sending the reconstructed sequence into a lock-in amplifier, and respectively extracting a second harmonic signal and a first harmonic signal; and S4, detecting the gas concentration through the ratio by using the mapping relation between the gas concentration and the ratio of the second harmonic signal to the first harmonic signal. According to the method, a continuous data discrete reconstruction technology is introduced into a modulation and demodulation process, and a reference time sequence is generated by utilizing the characteristics of a laser output signal, so that self-matching and dynamic adjustment of modulation frequency are realized, external signal interference is effectively avoided, and the harmonic extraction stability is improved; meanwhile, the hardware structure is simplified, and the adaptability of the system to different gas absorption spectral lines is enhanced.

The invention relates to the technical field of spectrograph temperature drift calibration, in particular to a crop spectrograph temperature drift calibration method based on dynamic temperature drift compensation, which comprises the following steps of: acquiring an actual wavelength drift deviation value of each temperature measurement point and each characteristic spectral line; obtaining a predicted wavelength drift deviation value of each temperature measurement point and each characteristic spectral line; carrying out calibration processing on the crop spectrometer according to the deviation; and obtaining the corrected wavelength. According to the method, original data under different temperature points and different characteristic spectral lines are collected, and the nonlinear relation between the temperature and the wavelength drift distance is captured, so that the wavelength drift distance is expanded to the full wave band, compared with a temperature drift calibration mode of an existing crop spectrometer, the wavelength drift distance in a full temperature range can be obtained in the mode, and the accuracy of temperature drift calibration of the crop spectrometer is improved. And the nonlinear relationship between the temperature and the wavelength drift distance is considered, so that the accuracy and the stability of temperature drift calibration of the spectrometer are improved.

The invention discloses an inversion method for obtaining an N2O gas volume mixing ratio profile based on a short-wave infrared laser occultation detection technology. The inversion method comprises the following steps: calculating a short-wave infrared atmospheric refractive index profile at the center position of an N2O gas absorption spectral line; calculating a collision parameter profile according to the short-wave infrared atmospheric refractive index profile, respectively calculating atmospheric transmittance profiles of an N2O gas absorption spectral line and a reference spectral line based on normalized energy data of infrared laser occultation detection, and executing Abel integral inverse transformation on a difference value between the atmospheric transmittance profiles to obtain an N2O gas absorption coefficient profile; converting the N2O gas absorption coefficient profile into an N2O gas initial volume mixing ratio profile; and by taking the N2O gas initial volume mixing ratio profile as an initial value, carrying out analog calculation on an atmospheric transmittance profile after N2O gas absorption, constructing a cost function, carrying out iterative optimization, outputting an N2O gas volume mixing ratio profile, and obtaining a final inversion result. According to the method, the inversion precision is improved.

The invention provides a thermal injection gas temperature measurement method and system based on spectral absorption, and the method comprises the steps: obtaining absorption spectrum signals before and after ignition of thermal injection gas, and carrying out the baseline correction of the absorption spectrum signals after ignition based on the absorption spectrum signals before ignition; performing environmental absorption interference processing on the corrected post-ignition absorption spectrum signal to obtain a target absorption signal reflecting the self absorption characteristic of the thermal injection gas; based on the target absorption signal, total integral absorbance in the two different measurement frequency bands is determined, and according to the ratio of the total integral absorbance of the two different measurement frequency bands, the pre-established mapping relation between the total integral absorbance ratio and the temperature is combined, and the temperature of the thermal injection gas is obtained through inversion. The invention provides a thermal injection fuel gas temperature measurement method based on a combined absorption spectral line so as to solve the problems of alignment of absorption signal base lines, interference removal of absorption components outside fuel gas jet flow, temperature inversion based on the combined absorption spectral line and the like, and a high-temperature fuel gas jet flow temperature measurement result is obtained.

The invention discloses a resonant frequency tracking control method and system for a diamond nitrogen vacancy color center, and belongs to the technical field of quantum sensing. The method comprises the following steps: setting an initial center frequency output by a microwave source; in the tracking control process, fluorescence signal changes generated by the diamond nitrogen vacancy color center under the microwave frequency modulation effect are recorded, a full-amplitude demodulation amplitude value R is obtained through demodulation, and whether the full-amplitude demodulation amplitude value R is smaller than a dead zone threshold value or not is judged; if yes, the center frequency output by the microwave source is not changed; if not, calculating the microwave frequency regulation quantity delta f according to the full-amplitude demodulation amplitude R; determining the adjusting direction of the center frequency f0 of the microwave source according to the phase-frequency characteristic and the real-time demodulation phase difference delta phi in the current frequency tracking control process; according to the microwave frequency adjusting quantity delta f and the adjusting direction, the center frequency of the microwave source is adjusted for resonant frequency tracking; wherein the phase-frequency characteristic is the characteristic of the demodulation spectral line on the two sides of the resonant frequency. The robustness and the accuracy of the resonance frequency tracking method are enhanced.

The invention relates to the technical field of spectrograph calibration, in particular to a spectrograph spectrum calibration and radiometric calibration method. According to the technical scheme, the method comprises spectrum calibration and radiometric calibration, the spectrum calibration comprises the steps that firstly, a standard light source is adopted for conducting initial spectrum calibration on an uncalibrated spectrometer to obtain an initial spectrum calibration equation, and then optical differential thickness data is obtained through a sample gas measurement experiment and combined with standard gas absorption cross section data; and calculating a wavelength difference value to correct the initial spectrum calibration equation to obtain a final spectrum calibration equation. The wavelength absolute error precision after spectrum calibration is improved by nearly one order of magnitude, the radiometric calibration error is greatly reduced, the stability and accuracy of radiometric calibration are remarkably improved, the problems that a traditional calibration method is limited in spectral line, poor in light source stability and large in extrapolation error are effectively solved, and the method is suitable for popularization and application. And a solid guarantee is provided for high-precision application of the spectrograph in the fields of environmental monitoring, material science, remote sensing technology and the like.

The invention relates to the technical field of metal material structure display, in particular to a DD432 alloy structure display method which comprises the following steps: S1, pretreating the surface of a DD432 alloy sample to obtain a to-be-detected surface; s2, scanning the surface of the sample by adopting a laser-induced plasma spectrum technology, and continuously controlling a laser beam scanning path by utilizing a three-dimensional mobile platform; s3, plasma emission spectrum data are collected, and characteristic spectral lines of Ni, Cr, Co, Mo, Al and Ti elements are identified; s4, converting the spectral data into structure characteristic information of grain size, precipitated phase distribution and grain boundary morphology through a machine learning algorithm; and S5, reconstructing a microstructure image based on the microstructure feature information. According to the method provided by the invention, the LIBS technology is adopted, complicated sample pretreatment is not needed, tissue information can be quickly obtained, and the sample is not damaged.

The invention relates to the technical field of pre-diagnosis and health management, in particular to a low-voltage switch cabinet insulation safety diagnosis method based on discharge characteristic analysis, and the method comprises the steps: synchronously collecting original optical signals through a multispectral sensor array; performing energy compensation by using a multipath reflection equivalent attenuation model to generate reconstructed spectral line intensity data; determining a virtual time zero point by using an autocorrelation function and generating virtual phase analysis atlas data; and constructing an energy spectrum gravity center space coordinate in the energy spectrum feature space to extract a gravity center red shift feature quantity. According to the method, through multi-band relative attenuation rate compensation, power frequency period statistical peak value extraction and energy spectrum space gravity center mapping, the diagnosis problem that the insulation state is difficult to quantitatively evaluate due to signal distortion, reference phase loss and fuzzy characteristic evolution in a non-line-of-sight environment is solved.

The application discloses a method and device for obtaining local gas temperature and equivalence ratio of a combustion field. Laser-induced breakdown spectroscopy technology is used to form a target plasma by laser-induced breakdown of a flame to be measured. Firstly, reference signals of the target plasma are collected to obtain a reference signal set, and current hydrogen atomic spectral line broadening and current plasma temperature of the target plasma are calculated. Then, the reference signals are input into a gas temperature characterization model to obtain a local gas temperature. The reference signals and spectral line intensities are input into a spectral line intensity correction model to obtain a corrected spectral line intensity set. Finally, the corrected spectral line intensity set, the current plasma temperature and the current hydrogen atomic spectral line broadening are input into an equivalence ratio measurement model to obtain the equivalence ratio of the flame to be measured. Through step-by-step correction of spectral intensity, the application can avoid the influence of temperature on equivalence ratio measurement, improve the accuracy of equivalence ratio measurement, and realize local gas temperature measurement.

The application discloses a trace element detection system and method, and belongs to the technical field of spectral quantitative detection. The system comprises a laser, a sample stage and a spectral signal acquisition system. The laser ablates a sample to generate plasma after passing through a half-wave plate, a Glan prism, a dichroic mirror and a lens group. The acquisition system comprises a wide / narrow band spectral signal collection system and a trigger system: the wide band system comprises an axial and first lateral light path, couples full spectrum signals to a spectrometer, and is used for matrix identification; the narrow band system comprises a second lateral collection lens, a light splitting element and a UV / visible double channel, each channel is sequentially provided with a neutral density filter, an ultra-narrow band filter and a plano-convex lens, and is connected to a photomultiplier tube to an oscilloscope, and high-sensitivity detection of specific element characteristic spectral lines is realized; and the trigger system is used for triggering the spectrometer to acquire. The wide band and narrow band collaborative architecture is adopted, and both material matrix identification and high-precision quantitative detection of trace elements are considered.

The application discloses a correction method for saturated spectral line intensity in laser spectroscopy, and relates to the technical field of spectral data analysis, wherein saturated characteristics in a spectrum are identified, a saturated point is determined based on an intensity threshold, and the original intensity of the saturated point is recorded; the wavelength range of a target spectral peak containing the saturated point is determined; the saturated point is removed from the wavelength range of the target spectral peak, and the unsaturated point is reserved; the unsaturated point is fitted through a nonlinear function, and the maximum intensity of the fitting is obtained; if the maximum intensity of the fitting is lower than the original intensity, the intensity is corrected in a linear extension mode based on the unsaturated point, otherwise, the intensity is directly corrected based on the fitting model; the corrected spectral intensity data are output, and the maximum intensity of the spectral peak and the integral area of the spectral peak are calculated. The application improves the accuracy of saturated determination and the reliability of correction results, and provides direct intensity data basis and core derivative parameters for quantitative analysis.

This application discloses a method for offline analysis of powder ionization conditions, comprising the following steps: placing a silicon wafer on a target plate of a plasma device; generating a plasma beam under preset powder ionization conditions using the plasma device; injecting powder into the plasma device so that the plasma beam bombards the powder until powder injection is complete; detecting whether a first condition and a second condition are met, wherein the first condition includes at least 70% of the powder injected into the plasma device ablation and brightening upon bombardment by the plasma beam and / or forming a coating on the silicon wafer; the second condition includes the coating containing chemical bonds formed by elements of the powder and / or detecting spectral lines generated by ionization of the powder upon bombardment by the plasma beam. If the first and second conditions are met, the powder is determined to be effectively ionized. Otherwise, the powder is determined to be ineffectively ionized. The method of this application can obtain basic research data on the boronization of boron powder.

The invention discloses a method for determining and analyzing lead, cadmium, iron and zinc in lead smoke dust through X-ray fluorescence spectrometry, and belongs to the technical field of determination and analysis of components of comprehensively recycled lead smoke dust in zinc smelting production. The method comprises the following steps: preparing an analysis sample by adopting a direct tabletting method without acid digestion of a sample and directly preparing soot powder under the working pressure of 30-40T and the dwell time of 15 seconds. A multiple regression correction method is adopted to correct matrix interference, a Pb L beta 1 element spectral line is selected to eliminate overlapping interference of a Pb K alpha 1.2 spectral line and an As K alpha 1.2 spectral line, and then a correction formula is added. The sample does not need to be subjected to complex chemical treatment, the original state of the cigarette ash sample can be kept, and multiple analysis or other subsequent tests can be carried out on the same batch of samples. The method can be used for simultaneously analyzing multiple elements, namely simultaneously determining multiple elements in the soot from macroelements to microelements such as Pb, Zn, Cd, Fe and the like, so that the analysis efficiency is greatly improved.

This invention relates to a method for assembling and adjusting a holographic concave grating monochromator, belonging to the field of optical instrument assembly and adjustment technology. It solves the problems of existing monochromator assembly and adjustment methods being cumbersome, time-consuming, labor-intensive, or having high theoretical requirements and low efficiency. The method involves leveling the holographic concave grating monochromator and laser; recording the initial spot height of the laser; directing the laser perpendicularly to the entrance slit of the monochromator to the center of the grating; measuring and recording the heights of the 0th and ±1st order diffraction spots; plotting the trajectories of the multi-order spectral spots; adjusting the pitch and / or tilt angle of the grating according to the trajectory until the center of each diffraction spot is collinear with the initial spot height; rotating the grating to allow the 0th order light to exit from the exit slit; using a right-angle fixture to adjust the grating shaft lever to be perpendicular to the drive screw and locking it; placing an external light source at the entrance slit; observing the clarity of the spectral lines at the exit slit using a microscope; and adjusting the thickness of the shim at the exit slit to achieve precise conjugate matching between the entrance and exit slits. This invention is simple to operate, quick to assemble and adjust, and highly accurate.

The invention provides a sensing device based on a stretchable metasurface and a heavy metal ion sensing method, and belongs to the technical field of optical sensing. The device comprises a flexible stretchable substrate and an optical metasurface arranged on the flexible stretchable substrate, a periodic nanostructure of the device can spontaneously suck liquid to be measured through the capillary effect, and meanwhile the metasurface period can be changed by stretching the substrate so as to tune the wavelength of an optical formant. The method comprises the following steps: applying strain to tune wavelength, introducing liquid to be measured to spontaneously fill, collecting spectrum and analyzing spectrum characteristics to determine the heavy metal ions. According to the invention, through integration of mechanical tuning and capillary sampling functions, the existing technical problems are solved, multi-dimensional detection based on wavelength selection and spectral line analysis is realized, and the device has the beneficial effects of high selectivity, high sensitivity, portability and capability of realizing multi-ion parallel detection.

This invention discloses a quantitative analysis system and method for overlapping gas components, belonging to the field of gas analysis and vacuum diagnostics technology. The system comprises: a vacuum chamber to be tested, a first valve connection, and a differential device connected in sequence; the differential device is connected to a mass spectrometry detection unit, a spectral detection unit, and a vacuum pump unit; the mass spectrometry detection unit is used to acquire ion current signals of the analyte gas in multiple mass-to-charge ratio channels; the spectral detection unit is used to acquire characteristic spectral signals of the analyte gas in multiple wavelength channels; a data processing and calculation unit is communicatively connected to the mass spectrometry detection unit and the spectral detection unit, respectively, to obtain and output the partial pressure or concentration of each candidate gas component. Overlapping gas components are those gas components that are difficult to accurately distinguish in mass spectrometry detection due to overlapping mass-to-charge ratio channel responses or overlapping or intersecting characteristic spectral lines in spectral detection. This invention improves the identification capability and quantitative accuracy of overlapping components.

The invention provides a method for detecting the content of zinc in a lithium-zinc binary alloy strip based on ICP-OES, and belongs to the technical field of metal material component analysis. According to the method, the lithium matrix is separated by adopting a nitric acid-perchloric acid digestion system, and the stock solution is diluted by 500 times, so that the concentration of the lithium matrix can be efficiently reduced, meanwhile, the signal inhibition effect is effectively eliminated by combining lithium salt matching, and the detection precision is greatly improved. According to the method, Zn 213.856 nm analysis spectral lines are carefully selected, RF power is optimized, spectral interference of other elements can be avoided, the linear range can be expanded, and the method is suitable for rapid determination of the zinc content of 1%-20%. According to the method, the detection limit can reach 0.01%, the relative standard deviation is smaller than or equal to 1.0%, the recovery rate is 98.5%-101.2%, and high-precision detection is achieved.

The application discloses a harmonic and adjacent inter-harmonic parameter estimation method, comprising the following steps: S1, performing Fourier transform on sampling data of a preset time length to obtain frequency domain data; S2, based on the frequency domain data, calculating the amplitude, frequency and phase parameters of a fundamental wave by using a multi-layer interpolation method and removing the influence of the fundamental wave component, and calculating the mapping relationship of a leakage spectrum line and frequency offset of a harmonic component; S3, based on the spectral difference of a single adjacent inter-harmonic and a symmetric adjacent inter-harmonic pair, constructing an adjacent inter-harmonic type criterion, determining the threshold of the criterion according to the noise size in a power system to judge the adjacent inter-harmonic type information; and S4, constructing an adjacent inter-harmonic spectrum line equation set based on the adjacent inter-harmonic type information, and solving the adjacent inter-harmonic spectrum line equation set by using an eigenvalue decomposition method to obtain the amplitude, frequency and phase parameters of the harmonic and adjacent inter-harmonic. The application can judge the type of the inter-harmonic under the frequency offset scene of the power system.

The application provides an atomic magnetometer light power adjustment system and method based on line width scanning, and belongs to the field of precision measurement. The atomic magnetometer light power adjustment system comprises: a magnetic field generating coil configured to generate a scanning magnetic field linearly changing over time based on a preset waveform driving current; an atomic gas chamber configured to modulate detection light of an atomic magnetometer based on the scanning magnetic field to obtain a light modulation signal; a photodetector configured to convert the light modulation signal into an initial electric signal; a signal processing module configured to obtain an atomic spectral line width value based on the initial electric signal; and an adjustment module configured to adjust a light attenuator of the atomic magnetometer based on a preset light power-atomic spectral line width calibration relationship, a target light power value and the atomic spectral line width value, so as to update the light power value of the atomic magnetometer.

The application relates to a fast demodulation system and method for a large-scale microcavity array on a chip, and the system comprises a frequency-sweeping laser, a first fiber coupler, a microcavity array transmission signal arm, an auxiliary interference reference arm, a same-frequency trigger arm and a signal processing device. The first fiber coupler is used for dividing a light source into a first light source and a second light source. The microcavity array transmission signal arm is used for receiving the first light source of the frequency-sweeping laser, and the first light source enters a large-array microcavity sensor device after polarization processing, and is converted into an electric signal after receiving the disturbance of an external sensing signal. The auxiliary interference reference arm is used for receiving the second light source of the frequency-sweeping laser, and two beams of coherent light with opposite phases are obtained after processing the second light source, and then the coherent light is converted into an electric signal. The same-frequency trigger arm is used for transmitting a same-frequency trigger signal emitted by the frequency-sweeping laser. The signal processing device is used for signal acquisition and processing. The application effectively suppresses the frequency-axis distortion and spectral line broadening caused by the frequency-sweeping nonlinearity of the laser, and can be applied to the accurate demodulation of a large-scale, high-Q microcavity sensing array.

The invention provides an immunochromatography detection result reading method and device based on solid quantum enhancement, and relates to the technical field of immunochromatography detection. The immunochromatography detection result reading method comprises the following steps: emitting exciting light to a standard substance to excite the standard substance to generate a fluorescence signal for detection; microwaves are output to a standard substance, so that the standard substance generates spin resonance, and the intensity change of a fluorescence signal is caused; collecting the fluorescence signal after intensity change to obtain an optical detection magnetic resonance ODMR reference spectral line; determining a corresponding microwave calibration frequency according to the optical detection magnetic resonance ODMR reference spectral line; exciting light and microwaves which are calibrated according to the microwave calibration frequency and are subjected to amplitude or frequency modulation are emitted to a tested sample; and respectively detecting the fluorescence intensity variation of the quality control line and the detection line to obtain an immunochromatography detection result of the detected sample. The microwave frequency is calibrated by using the standard substance, the interference of background fluorescence is effectively shielded, and the detection sensitivity and accuracy are improved.

The application relates to the technical field of spectral calibration, in particular to a spectral calibration method and device of a single-lens imaging spectral system. Step 100: according to the focal length of the single lens, the distance between the single lens and the detector is adjusted, the monochromator is controlled to be turned on, and the wavelength is initialized; step 102: the two-dimensional displacement platform is controlled to move according to a preset distance, so as to record each acquisition position of the detector and the corresponding number; step 104: the gray-scale map data collected by the detector is fitted, so that the maximum value position of the spectral line and the corresponding number are obtained; step 106: the initialized wavelength is adjusted according to a preset increment; step 108: steps 100 to 106 are circularly executed, so that the position number of the maximum value of the spectral line under different wavelength conditions is obtained; and step 110: the spectral calibration position is determined based on the position number of the maximum value of the spectral line under different wavelength conditions. In this way, the calibration of the spectral center wavelength can be accurately and efficiently completed.

The invention discloses a gas detection method, a gas detection device, a storage medium and a program product, relates to the technical field of oil and gas pipelines, and aims to solve the problem that leaked gas cannot be accurately detected. The gas detection method comprises the following steps: scanning and outputting laser of an absorption spectral line of gas to be detected to a target area; receiving a retroreflection light signal of the target area through a plurality of pixels in the area array detector; determining an absorption spectrum signal based on the retroreflection light signal received by each pixel; and performing spectral data processing on the absorption spectrum signal to obtain the concentration information of the gas to be detected in the target area.

This invention relates to a planar superlens for spaceborne terahertz detectors. The planar superlens comprises an independent aluminum foil, on which an array of resonant units arranged in concentric rings is disposed. The resonant unit array includes various C-shaped resonant units with different structural parameters, each C-shaped resonant unit being a C-shaped hole structure etched into the aluminum foil. C-shaped resonant units with the same structural parameters are arranged at equal intervals on a ring band with the same arrangement radius, forming, from the inside out, a paraxial fine control module, a mid-ring band phase compensation module, a mid-to-far ring band phase modulation module, and an edge region phase coverage module. Compared with existing technologies, the superlens proposed in this invention has outstanding features such as large depth of focal length, tight focusing, lightweight, low cost, and resistance to space environments. It is particularly suitable for integration into terahertz detection payloads of meteorological satellites, which are extremely sensitive to weight and volume, and can be used for remote sensing missions such as ice cloud detection and atmospheric composition spectral line observation.

The application provides a small sample number underwater target recognition method based on deep learning, comprising the following steps: S1, modeling underwater target radiation noise, giving an underwater target radiation noise DEMON spectrum processing method, and pre-processing the DEMON spectrum; S2, processing the radiation noise, simulating different working states and motion states of the target, and extracting sample combinations to generate sample pairs for training, verification and testing of a neural network model; S3, designing a one-dimensional convolutional neural network-based twin network model, training parameters of the convolutional neural network, evaluating network performance by using a verification set containing different Doppler frequency offsets, different signal-to-noise ratios and different spectral line numbers, obtaining a convolutional neural network model, and using the model to calculate the "similarity" of two underwater target radiation noise samples, and further judging whether the two samples are the same target or not. The application has the beneficial effect that the small sample number underwater target recognition problem can be solved.

The invention is suitable for the technical field of absorption spectrum analysis, and provides a Momentum optimization-based absorption spectrum high-precision fitting method, which comprises the following steps of: updating a track by tracking a momentum parameter in real time, and constructing a dynamic error curved surface topology analysis system; and identifying terrain structures such as plains, canyons and multiple peaks, and adaptively switching an optimization strategy: enhancing momentum inertia acceleration convergence in the plains, starting damping to suppress oscillation in the canyons, and adjusting an exploration range through curvature prediction in a multi-peak region. Aiming at an entanglement error curved surface of overlapped spectral lines, decoupling parameters through momentum spiral motion characteristics and performing divide-and-conquer optimization; and when track oscillation is detected, reconstructing a physical model constraint condition to repair the curved surface. The method breaks through the bottleneck of parameter coupling and model mismatching of traditional fitting, realizes high-precision fitting of complex spectrums, is suitable for the fields of environmental monitoring, chemical analysis and the like, and remarkably improves the fitting efficiency and precision compared with the prior art.

The application discloses a titanium alloy component determination method and system based on a spectrometer, and comprises the following steps: focusing a first laser pulse on the surface of a titanium alloy sample to be measured to generate an initial excitation area; after a preset delay time after the action of the first laser pulse, a second laser pulse is applied to the initial excitation area; during the action of the second laser pulse, the spectrum signal emitted by the initial excitation area is collected in at least two different preset polarization analysis directions to obtain polarization-resolved spectrum data; a characteristic analysis signal of a target element is obtained; and the component content of each element in the titanium alloy sample to be measured is calculated according to the characteristic analysis signals of the target elements. The spectrum signal is collected in at least two different preset polarization analysis directions to obtain polarization-resolved spectrum data, and the response signal under a specific polarization direction combination is calculated to obtain a characteristic analysis signal, so that the isotropic background radiation and the spectral line interference of non-target elements are effectively suppressed from the physical principle.

The invention relates to the technical field of optical clock metering instruments, in particular to a microscopic particle mass measurement method and system based on an optical lattice clock, and the method comprises the steps: forming a one-dimensional horizontal shallow light lattice to constrain a to-be-measured microscopic particle based on an optical lattice clock platform; firstly, to-be-measured particles are subjected to laser cooling and then loaded to optical lattices, and the to-be-measured particles are prepared to a ground state single Zeeman sub-energy level through optical pumping. Then, modulating a beam of lattice light in the one-dimensional horizontal shallow light lattice to enable the lattice light to periodically shake; then, determining the line widths of clock transition spectral lines of the particles to be measured under different modulation amplitudes, and finding out the critical modulation amplitude corresponding to the minimum line width; and finally, according to the critical modulation amplitude and the lattice light wavelength, accurately deducing the absolute mass of the microscopic particles imprisoned by the light lattice.