56 results about "Wavelength calibration" patented technology

The invention provides a method and a system for detecting gas concentration in an epitaxial growth reaction cavity, computer equipment and a storage medium. The method comprises the following steps: acquiring a reflected light signal, a reference signal and a reaction cavity environment signal; carrying out wavelength calibration and intensity baseline calibration on the reflected light signal according to the reference signal, and generating an experimental absorption spectral line according to the calibrated reflected light signal; according to the reaction cavity environment signal, fitting the experimental absorption spectral line and a target absorption spectral line obtained by querying a preset database, and performing inversion to obtain concentration information of the gas to be detected. According to the invention, through double calibration of a reference channel, an experimental spectral line and a database target spectrum are strictly aligned on a frequency scale and an amplitude scale, interference of linear displacement and baseline fluctuation on fitting is reduced, and quantitative precision is improved; and meanwhile, an environmental condition is introduced as a physical constraint, so that parameter coupling is weakened, the identifiability and robustness of inversion are improved, the dependence on pure empirical correction is reduced, and the stability of detection data is improved.

The invention discloses a fiber optic spectrometer for film thickness measurement. The fiber optic spectrometer comprises a control and data processing module, a detection module, a light source module and a light splitting module, the optical fiber coupling module couples wide-spectrum light of the light source module and then guides the light to the light splitting module; the light splitting module adopts a cross-type Czerny-Turner light path structure, and performs collimation, dispersion and focusing processing on light beams in sequence; the detection module is used for receiving the optical signal processed by the light splitting module and forming an interference pattern; and the control and data processing module is used for driving acquisition, completing pixel-wavelength calibration and calculating the film thickness based on an acquired interference pattern. According to the optical fiber spectrometer measurement method for film thickness measurement, the problem of low accuracy of real-time film thickness detection in the prior art is solved.

The invention provides a device and method for calibrating the wavelength of a spectrometer, and belongs to the technical field of optics, and the device comprises a light source module which is used for outputting wide-spectrum continuous light; the collimation module is used for outputting collimated light based on the wide-spectrum continuous light; the polarizer is used for generating linearly polarized light based on the collimated light; the rotating platform is used for placing a wave plate; the polarization analyzer is located in the light beam output direction of the wave plate; the focusing module is used for converging the light beams output by the polarization analyzer to the spectrograph; the spectrograph is used for detecting the energy of the input light beam so as to output corresponding optical data; the optical data comprises pixels and light intensity data of the input light beam; and a processor for determining a ratio of maximum response discrete light intensity data to minimum response discrete light intensity data based on the optical data, determining a peak center pixel position based on the ratio, and calibrating the spectrometer wavelength based on the pixel position. According to the invention, the technical problem of low accuracy of the wavelength calibration result of the existing spectrograph wavelength calibration method can be solved.

A concurrently measuring multiple light input spectrometer with a shared or common optical path is described. The spectrometer can help eliminates errors from dark offsets, can reduce impact of ambient optical and electrical noise, and can mitigate temperature effects. Additionally, it can help readily provide wavelength calibration. By using just two inputs, spectrometer can provide true spectral measurement of the test object by continuous measurement of the spectra of the source and the spectra of the source light after interacting with the test object. More generally, including an individual photodetector (instead of an array of multiple photodetectors) associated with each input can help address solving the problems that may get introduced by using multiple photodetectors for a particular input.

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 provides a wavelength calibration and measurement method based on a measuring device, comprising: obtaining full-waveband light intensity information of a sample to be measured, and processing to obtain a measured Fourier coefficient corresponding to each wavelength; fitting and iteratively obtaining a first system parameter corresponding to each wavelength, a sample thickness and an incident angle according to the measured Fourier coefficient and a theoretical Fourier coefficient of each wavelength; fitting and iteratively obtaining a global sample thickness and a global incident angle through a specific function; fixing the global sample thickness and the global incident angle, and fitting and iteratively obtaining a second system parameter corresponding to each wavelength again; and calculating a full-waveband spectral Mueller matrix of the sample to be measured according to the measured Fourier coefficient corresponding to each wavelength and the second system parameter. The application obtains parameters such as the global sample thickness and the global incident angle which do not change with the wavelength through an iterative fitting mode, and then calibrates other parameters, which is more accurate compared with the prior art of determining the global sample thickness and the global incident angle according to experience.

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 invention discloses a low-energy-consumption wavelength and intensity composite standard lamp which structurally comprises a deep ultraviolet module, a visible-infrared module, a micro-channel heat dissipation structure and a rare earth sharp line calibration unit. The core innovation is that a rare earth sharp line calibration unit is integrated on the basis of a standard intensity lamp, that is, a cuvette filled with a Re (Er-Ho-Dy) (NO3) 3 or Re (Er-Ho-Dy) (ClO4) 3 ternary mixed solution is additionally arranged at a light source outlet. The device has the beneficial effects that the device can be switched to a sharp line mode on the basis of an intensity calibration function to realize high-precision wavelength calibration, is compact in integration, and adapts to a portable detection scene.

The application provides a PPG baseline calibration method for a wearable continuous blood pressure monitoring device, which comprises the following steps: decoupling the relationship between contact pressure and infrared PPG baseline; since pressure is a scalar, the contact pressure change of the measured position can be equivalent to the opposite change of the hydrostatic pressure inside the artery; collecting infrared PPG waveforms under different hydrostatic pressures through two different height postures to model the relationship between contact pressure and PPG waveform, MLP modeling and the setting of a dual-wavelength calibrator; without affecting the extraction of blood pressure related features; enabling the existing blood pressure monitoring algorithm to achieve the A-class standard of BHS in long-term continuous monitoring; the method can be directly deployed in the existing blood pressure monitoring system without modifying the original blood pressure algorithm or model structure; the problem that PPG baseline drift occurs due to long-term wearing of the wearable device and thus continuous and accurate blood pressure monitoring cannot be achieved is solved; and more accurate continuous blood pressure monitoring can be achieved.

The invention discloses an ultra-narrow band optical filter absolute frequency reference in-situ calibration device which comprises a hollow cathode lamp, the output end of the hollow cathode lamp is connected with one input end of a one-to-two optical fiber through a light beam coupling device, and the output end of a variable diaphragm is connected with the other input end of the one-to-two optical fiber through an optical fiber; light beams output by the one-to-two optical fiber are split, the first split beam is input to the second photoelectric detector, and the second split beam transmits the ultra-narrow band light filter and is detected by the first photoelectric detector; the invention further discloses an in-situ calibration method for the absolute frequency reference of the ultra-narrow band light filter, the center transmission wavelength of the etalon is calibrated through the absolute wavelength of the hollow cathode lamp, the etalon is accurately controlled at constant temperature and constant voltage, the center transmission wavelength of the etalon is calibrated, and the calibration of the center wavelength of the etalon is integrated with an external optical signal detection function; and through the automatic calibration process, the calibration efficiency is greatly improved, manual operation errors are avoided, and a high-precision calibration task can be completed in a short time.

The application discloses a double-optical-path spectrometer, a color measurement device and a calibration method, and relates to the field of color measurement devices. The color measurement device obtains reflected light of a measured sample and reflected light of a test light source, and inputs the reflected light into a first incident slit and a second incident slit of a spectrometer through a Y-shaped light path unit; the reflected light is incident on a grating through a lens; diffracted light spots returned by the grating are incident on a photosensitive surface of a sensor on the side of the incident slit through the lens; the photosensitive surface is provided with an aperture stop with a dislocation opening; and the photosensitive surface at each dislocation opening only receives light signals of one light path, so that the short-term repeatability of spectrophotometry is improved. When wavelength calibration is performed, light signals of a calibration light source are obtained through the Y-shaped light path unit; pixel position information of the collected light signals is obtained according to a sensor of the spectrometer; a fourth-order polynomial is used to fit wavelength data and the pixel position information; the correspondence between the pixels and the wavelengths is adjusted; and the wavelengths are calibrated, so that the short-term repeatability of spectrophotometry is improved.

The application provides a kind of management and control chemical fast LIBS classification identification model construction method, medium and system, belongs to management and control chemical technical field, the application is by collecting mercury argon reference lamp spectrum to carry out wavelength calibration, according to atomic spectrum database extraction management and control element characteristic transition wavelength window and compressed to low-dimensional feature space by sparse self-encoder, with hydrogen line starker broadening and Boltzmann graph slope method real-time inversion electron density and electron temperature and to compressed characteristic matrix is physically normalized, calculates plasma drift index to adaptively adjust plasma parameter decoupling double-flow condition graph network update strategy, the normalized characteristic matrix and physical diagnostic value are input into the artificial intelligence network to output element concentration vector and class prediction probability, solve the technical problems that plasma parameter fluctuation leads to laser-induced breakdown spectroscopy classification feature instability, classification accuracy significantly decreases under the condition of cross-instrument and cross-matrix.

This invention provides a traceable uncertainty assessment method for dynamic wavelength calibration. First, it performs uncertainty source analysis based on Taylor series expansion, determining that the time-frequency relationship calibration uncertainty is mainly determined by the uncertainty of the local continuous time-frequency relationship. Then, it assesses the impact of peak location on uncertainty, the uncertainty of the standard interferogram, and the uncertainty of interference intensity under complex tuning conditions, quantifying the standard interferogram uncertainty and the measurement uncertainty generated by local normalized frequency interpolation. These are then combined to obtain the combined uncertainty of the normalized time-frequency relationship. Finally, the combined uncertainty of the normalized time-frequency relationship is multiplied by the free spectral range of the F-P interferometer to obtain the absolute uncertainty of the time-frequency relationship calibration. This invention enables the quantification and propagation analysis of each error component during nonparametric point-by-point calibration, establishing a systematic uncertainty assessment framework and providing a scientific basis for the reliability of the calibration results.

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

This application provides a multi-parameter fiber optic monitoring device for bolt loosening on transmission towers, belonging to the field of bolt loosening monitoring. It aims to solve the problems of existing bolt loosening monitoring schemes, such as susceptibility to strong electromagnetic interference, low integration, inability to cover the entire loosening cycle, and high false alarm rate. This device includes an integrated fiber optic grating-Fabry-Perot cavity sensor head and signal demodulation system, employing a coaxial push rod-mass block integrated linkage structure to achieve synchronous acquisition and mechanical decoupling of bolt axial displacement and triaxial vibration. Through a dual-band optical path architecture of 1310nm O-band and 1550nm C-band, combined with a dual-window wavelength division multiplexer, complete optical decoupling of the two parameters is achieved. It is equipped with dual-link independent wavelength calibration, hardware full-link synchronous triggering, and a dual-parameter mutual verification mechanism. This application is inherently resistant to strong electromagnetic interference and can achieve highly reliable monitoring of bolt loosening throughout its entire lifecycle.

The application relates to the field of optical measurement, in particular to a novel single-spectrum confocal sensor precise thickness measurement calibration and evaluation method, which comprises the steps of spectrum data preprocessing, spectrum stability evaluation, algorithm error verification, displacement-wavelength calibration, exit angle-wavelength calibration and the like, noise is eliminated through normalization processing by acquiring dark current noise signals and the like, spectrum flatness and stability are evaluated by using a specific area filter, the accuracy and precision of an algorithm are calculated by using an odd-even grouping method, and the like, and the application also relates to a spectrum confocal thickness measurement system which stores a calibrated relationship for real-time thickness calculation.The application achieves the technical effects of eliminating light source modulation, dark noise and optical path crosstalk noise, accurately evaluating spectrum stability, accurately verifying algorithm error, realizing accurate calibration of displacement-wavelength and exit angle-wavelength, and further realizing accurate thickness measurement.

The invention belongs to the technical field of environmental monitoring, and discloses a hydroxyl radical online generation and reference inspection method and device and application, and the device comprises a laser splitting unit, a laser collimation and focus lens group, a laser incident cavity, a reference cavity, a laser emergent cavity and an atmospheric hydroxyl radical measurement cavity. The device not only can continuously and stably generate high-concentration hydroxyl radicals, but also can monitor resonance fluorescence signals generated by the hydroxyl radicals in real time, has the advantages of high signal-to-noise ratio, low cost, good adaptability, stable and reliable operation and the like, and can be used as a key core component of a free radical measurement system by a laser-induced fluorescence method. The method not only can be directly applied to dye laser wavelength monitoring and locking, but also can be applied to dye laser wavelength calibration instead of a wavemeter.

The invention relates to the technical field of laser and optical sensing, in particular to a rapid absolute wavelength calibration method and system for a continuous frequency sweeping laser light source, and the method comprises the steps: carrying out the filtering of broadband frequency sweeping light through an adjustable narrow-band filter, generating transmission light 1, and generating transmission light 2 through an FP etalon; the generated transmission light 1 and transmission light 2 are converted into electric signals by a photoelectric detector 1 and a photoelectric detector 2 respectively, and trigger signals and electric signals are acquired by an oscilloscope; and the upper computer PC end performs waveform fitting and peak searching on the electric signal according to the trigger signal acquired by the oscilloscope, and performs curve smoothing and interpolation processing on a wavelength and time coordinate point set represented by a peak value position of a transmission peak to obtain a change relation of the wavelength of the original nonlinear frequency sweep light along with time. The calibration method provided by the invention is simple and efficient, is not influenced by wavelength tuning step size and frequency sweeping speed, and solves the problem of wavelength overlapping at the switching position of each adjacent DFB laser channel of the laser array.

The invention belongs to the technical field of laser interferometer calibration, and discloses a laser interferometer installation error calibration method comprising the following steps: environment preparation: setting temperature, humidity and vibration parameters of a laser interferometer calibration environment; optical element cleaning, wherein absolute ethyl alcohol and lens paper are used for wiping the optical elements, and the optical elements specifically comprise a laser transmitter, a receiver and a reflector; laser wavelength calibration; calibrating the straightness; calculating an Abbe error; cosine error calculation; and calculating a dead stroke error. According to the calibration method for the installation error of the laser interferometer, the measurement precision of the laser interferometer is effectively improved, the measurement result is more stable and accurate, and the strict requirement of a high-precision numerical control machine tool for displacement measurement precision is met; and meanwhile, the method also has good universality and effectiveness in a complex curved surface measurement scene, and the measurement precision of the laser interferometer in a complex application environment can be effectively improved.

The invention provides a laser wavelength stabilizing device and method based on a special TEC controller. The device comprises a core chip module, a temperature setting module, a temperature feedback module, a TEC load module, a power supply and protection module and a PID compensation module, wherein the core chip module adopts an ADN8834 or ADN8835 chip to construct a hardware PID closed-loop control architecture; the method comprises the steps that a target temperature voltage signal is output through the temperature setting module, the temperature feedback module collects the temperature of the laser in real time and converts the temperature into feedback voltage, the core chip module compares the target signal with the feedback signal based on a hardware PID algorithm, a regulation and control current is output to drive the TEC load module to achieve refrigeration / heating, and control performance is optimized in cooperation with the PID compensation module. The invention is applied to the technical field of laser temperature control and wavelength calibration.

The application belongs to the technical field of environmental monitoring, and discloses a hydrogen-oxygen radical online generation and reference checking method, device and application. The device comprises a laser light splitting unit, a laser collimation and focusing lens group, a laser incidence cavity, a reference cavity, a laser emission cavity and an atmospheric hydrogen-oxygen radical measurement cavity. The device can not only continuously and stably generate high-concentration hydrogen-oxygen radicals, but also can monitor the resonance fluorescence signal generated by the hydrogen-oxygen radicals in real time. The device has the advantages of high signal-to-noise ratio, low cost, good adaptability, stable and reliable operation, etc. As a key core component of a laser-induced fluorescence method radical measurement system, the device can be directly applied to wavelength monitoring and locking of a dye laser, and can be used for wavelength calibration of the dye laser instead of a wavelength meter.

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

The invention relates to the technical field of semiconductor lasers, and particularly discloses a laser wavelength calibration method comprising the following steps: obtaining a training data set including a first left gate current data set, a first right gate current data set and a first wavelength data set; a mapping model is established, the input of the mapping model is the first left gate current data set and the first right gate current data set, and the output of a mapping function is a first wavelength data set; taking a second left gate current data set and a second right gate current data set as input of the mapping model, and predicting a second wavelength data set corresponding to the second left gate current data set and the second right gate current data set, the second left gate current data set and the second right gate current data set are current data acquired from the laser in the target acquisition time period.

This invention discloses a method and system for optimizing the spectral dispersion coefficient of a greenhouse gas spectrometer before launch. The method includes: acquiring the instrument's linear function, initial dispersion coefficient, and laboratory direct solar observation spectrum; simulating the atmospheric absorption spectrum based on a radiative transfer model and performing convolution processing using the instrument's linear function; screening for positionally robust reference absorption lines through environmental parameter sensitivity analysis; fitting the observed spectrum and simulated spectrum to find peaks, extracting the center wavelength, and calculating the wavelength shift; establishing a polynomial fitting relationship for the wavelength shift to obtain the wavelength shift fitting coefficient; performing a difference calculation between the initial dispersion coefficient and the wavelength shift fitting coefficient, keeping higher-order terms unchanged, and outputting the optimized dispersion coefficient. This invention can effectively improve the wavelength calibration accuracy of the spectrometer before launch.

The invention discloses a multi-wavelength calibration-free optical phased array system, a chip and a control method thereof. The system comprises a coupler, a spot size converter, a phase shifter and an optical antenna, the coupler is used for coupling external multi-wavelength signal light to the on-chip waveguide; the spot size converter is connected with the coupler and is used for expanding the mode size of the input waveguide from a submicron order to a dozens of micron order so as to form wavelength-independent uniform wavefront on a chip; the phase shifter is arranged between the spot size converter and the optical antenna and is driven by a single voltage to form linear temperature distribution in the transverse direction, so that a continuous phase gradient is applied to the uniform wavefront; and the optical antenna is used for radiating the light field subjected to phase regulation to a free space to complete multi-wavelength synchronous scanning.

This invention discloses a method and system for preprocessing spectral data of a miniature ultraviolet spectrometer. The method includes: acquiring raw spectral data of the target and determining calibration spectral data; sequentially performing dark current smoothing and dark current removal on the raw spectral data; acquiring the calibration spectral data and performing wavelength calibration on the raw spectral data after dark current smoothing and dark current removal based on the size of the wavelength calibration flag; and performing smoothing processing on the wavelength-calibrated raw spectral data. This invention sequentially performs dark current smoothing, dark current removal, wavelength calibration, and smoothing processing on the raw spectral data, enabling accurate detection of low-concentration gases under conditions of simultaneous measurement of multiple component gases.

This invention relates to the field of spectroscopic instrument calibration technology, and discloses a spectral wavelength calibration method based on grating dispersion and spatial filtering, comprising: 1. incident collimated light from a broadband light source onto a grating; 2. setting a spatial filter that can move along the dispersion direction near the image plane of the dispersive optical path, and selecting narrowband light with different center wavelengths from the continuous spectrum by moving the filter; 3. for each filter position, measuring the center wavelength of the selected narrowband light using a high-precision spectrometer, and capturing a spot image using a detector array to be calibrated; 4. extracting the centroid pixel coordinates of the spot from the image; 5. fitting the wavelength and pixel coordinates to establish a calibration equation between the pixel coordinates and the wavelength. This invention does not overly rely on discrete standard light sources, can actively and continuously acquire high-density calibration points, the process is easy to automate, and the calibration accuracy is high, making it suitable for online calibration of miniaturized and integrated spectrometers.

The application belongs to the technical field of biomedical detection, and discloses a Raman spectrum analysis device for quantitative detection of blood tumor markers, which comprises a blood collection and centrifugal unit with an adaptive load adjustment mechanism, which is used for real-time monitoring of blood density and composition, and automatic adjustment of centrifugal force and time parameters according to the blood density and composition; a fiber Raman spectrometer equipped with an automatic wavelength calibration system, wherein an ultrafast laser pulse emitter and a high-sensitivity photon counting detector are integrated on the fiber Raman spectrometer; the application enhances the Raman scattering signal by adopting a quantum entangled light source and a nonlinear optical crystal, and can significantly improve the detection capability of low-concentration tumor markers. This improvement enables the device to accurately detect the presence of tumor markers in the early stage of cancer, providing strong support for early treatment of patients.

The invention relates to the technical field of optical communication and sensing, and provides a rapid adjusting and testing method for a DBR laser, which comprises the following steps of: acquiring a wavelength output parameter of the DBR laser as a preliminary parameter; calling fitting parameters corresponding to the preliminary parameters; and carrying out double closed-loop control processing on circuits corresponding to the multiple wavelengths based on the fitting parameters so as to finish accurate wavelength adjustment of the DBR laser. The invention further provides a rapid adjusting and testing system of the DBR laser, the rapid adjusting and testing system comprises a wavelength detection module and a data processing unit, the wavelength acquisition unit is used for acquiring the wavelength of the DBR laser, and the data processing unit is used for calling the fitting parameters corresponding to the wavelength output parameters. And performing double-closed-loop control processing on the lines corresponding to the multiple wavelengths based on the fitting parameters. The invention further provides a wavelength calibration device which adopts the rapid adjusting and testing method. According to the invention, by optimizing the adjusting and testing process and introducing the intelligent control strategy, the adjusting and testing time is obviously shortened, and the working efficiency is improved.

This invention discloses a real-time monitoring system for the migration front of a saline aquifer based on fiber Bragg grating sensing, belonging to the field of carbon capture, utilization, and storage. The system comprises a well monitoring unit, a surface demodulation unit, and a data inversion unit. This invention solves the problems of existing monitoring technologies, such as cross-sensitivity to temperature and pressure, poor formation coupling, poor long-term stability, and inability to actively identify the migration front. This invention establishes a direct hydraulic connection with the native formation fluid through a fish-scale-like penetrating structure, achieving high-fidelity pressure measurement. The surface demodulation unit ensures demodulation accuracy over long periods through a dual-fiber cable redundancy architecture and a dual-wavelength calibration mechanism. The data inversion unit dynamically corrects the geological model based on an ensemble Kalman filter assimilation algorithm, combining an active excitation composite monitoring mode with four-dimensional visualization technology to invert the spatiotemporal evolution of saturation and dynamically present the migration front.