547 results about "Multi wavelength" patented technology

A pest control system is disclosed comprising an optical, computational, and monitoring subsystem, optionally mounted on a mobile platform. The optical system may include a neutralizing laser or multi-wavelength light source, discovery and detail cameras (optionally stereo), a beam-steering mechanism, tunable focus, and optional thermal or depth sensors. The processor, such as a GPU or FPGA, identifies insect or biological targets, adjusts laser focus by depth, and controls beam activation. A monitoring system verifies safety by detecting humans or other non-target entities using environmental and thermal cameras; if detected, laser firing is inhibited. The mobile platform may use wheels, propellers, tracks, or cables, with GPS and data links for remote control. A visible light pre-flash may induce a blink reflex before firing. In some embodiments, a scouting drone transmits target coordinates to the neutralization unit, enabling coordinated, efficient, and safe laser-based pest control.

The invention discloses an LED chip appearance defect detection method based on image processing, and relates to the technical field of image processing, and the method comprises the following steps: S1, carrying out the multi-angle and multi-wavelength scanning of a defect-free reference LED chip under a stable exposure condition, extracting the dominant frequency vector and direction distribution information of the surface microstructure of the LED chip, and carrying out the detection of the appearance defect of the LED chip; an interference risk map is generated based on the dominant frequency vector and the direction distribution information. According to the method, dynamic adjustable optical imaging parameters and image processing results are deeply coupled, a closed-loop detection mechanism for adaptively inhibiting interference fringes is constructed, and accurate defect and interference distinguishing is realized through an interference risk map, a phase consistency index, discrimination subspace backstepping and optical adjustment, frequency domain notch and spatial domain detail recovery, so that the detection accuracy is improved. And in combination with confidence feedback and encryption sampling, the missing detection and false detection rate is remarkably reduced, and the detection stability and reliability are improved.

The invention discloses an on-chip optical interconnection and switching chip and an application system thereof. Wherein the on-chip optical interconnection and exchange chip is integrated by a power divider, a bidirectional optical transceiver unit and an optical switch unit; the application system of the on-chip optical interconnection and switching chip comprises a multi-wavelength light source used for generating multi-wavelength optical carrier signals, a transceiving unit control and clock module used for bidirectional transceiving unit feedback / amplifier control and clock synchronization, and an optical switching control module used for switching an optical switching unit switching link. The chips and the modules are used for realizing optical interconnection and optical switching of the special electrical computing chip ASIC. According to the invention, bidirectional optical interconnection and exchange of special computing electric chips such as a CPU, a GPU, a DPU and the like can be realized by utilizing an on-chip optical interconnection and exchange technology, the interconnection rate is high, the exchange switching time is short, computing power cluster networking oriented to artificial intelligence application can be supported, and the application prospect is good.

The invention relates to the technical field of water vapor concentration detection, and discloses a water vapor concentration online detection method and system based on a multi-wavelength infrared absorption spectrum, and the method comprises the steps: controlling an infrared light source module to emit pre-modulated light, enabling the pre-modulated light to pass through a gas chamber module, inputting the pre-modulated light into a photoelectric detection module, and converting the pre-modulated light into a sample electric signal; acquiring temperature data and pressure data at a preset position of the air chamber module in real time; calculating to obtain an initial differential absorption signal by using the sample electric signal and combining a Lambert-Beer law; based on the temperature data and the pressure data, performing temperature and pressure dynamic compensation on the initial differential absorption signal by using a pre-stored compensation database to obtain a target differential absorption signal; and determining the water vapor concentration according to the target differential absorption signal. According to the invention, the effects of improving the measurement precision and the measurement stability of the water vapor concentration and measuring the water vapor concentration online in real time can be achieved.

The invention discloses a detection kit and method for detecting allergic inflammatory factors based on a centrifugal micro-fluidic chip, and relates to the field of kits, the detection kit comprises the centrifugal micro-fluidic chip and a preset reagent; the centrifugal micro-fluidic chip comprises a chip base body, a sample adding cavity, a liquid level sensor, a liquid level sensor, a liquid level sensor, a liquid level sensor and a liquid level sensor, the nucleic acid extraction and purification cavity comprises a plurality of amplification cavities; a reagent storage chamber; a waste liquid chamber; and a capillary valve. The functions of nucleic acid extraction, variable temperature amplification and multi-target synchronous detection are integrated through the centrifugal micro-fluidic chip, full-closed operation is achieved by means of centrifugal force or other driving force such as air pressure and electroosmotic flow, and the pollution risk caused by manual step-by-step operation is thoroughly eliminated; a multi-wavelength distinguishable fluorescent probe and a grouping preset primer combination are adopted to synchronously complete parallel detection of the allergic inflammatory factor mRNA and the drug accompanying diagnosis target, cross interference is avoided, and large instruments and equipment do not need to be relied on.

This application relates to a monolithically integrated multi-wavelength topological cavity surface-emitting laser (PCSEL) array. According to one embodiment, a monolithically integrated PCSEL array includes multiple PCSELs formed from the same semiconductor layer, at least one layer of which is formed as a photonic crystal layer, or the laser also includes a separate photonic crystal layer. The photonic crystal layer includes multiple supercell structures, each with substructures having multiple independent one-dimensional parameters. At least two independent one-dimensional parameters of one or more substructures are modulated to be greater than or less than their equilibrium position to open the Dirac point of the supercell's bandgap at the equilibrium position. Around any point in the photonic crystal layer, the modulation of the two independent one-dimensional parameters of the supercell forms a vortex structure, which corresponds in parameter space to one or more turns around the equilibrium position. The supercell lattice constants of the two lasers can be different to emit lasers of different wavelengths.

The invention belongs to the technical field of visible light detection, and aims to realize accurate detection of multicolor visible light and monolithic integration of a multi-wavelength receiver. The invention provides a fully-integrated multicolor visible light detector based on a sub-wavelength polycrystalline silicon grating, which comprises three detectors capable of selectively detecting blue, green and red signals respectively. The principle is as follows: a one-dimensional sub-wavelength polycrystalline silicon grating in the multicolor detector is embedded in an upper SiO2 layer and a lower shallow trench isolation region to form a dielectric waveguide structure of which the middle is a high-refractive-index medium and the periphery is a low-refractive-index oxide layer. The period and the grating width of the sub-wavelength grating are changed, so that the incident polarized light and the sub-wavelength periodic structure are strongly coupled to cause a guided-mode resonance effect, and the sub-wavelength grating can be applied to a transmission optical filter. The size and the cost of the multicolor visible light communication system can be effectively reduced, and the data transmission rate of the system is greatly improved.

The invention relates to the technical field of new material detection, in particular to a touch screen production fault detection method based on data feedback, which comprises the following steps of: arranging a transmission spectrum detection device on a flexible touch screen roll-to-roll production line, and continuously monitoring a plurality of layers of films by adopting a U-shaped light path structure to obtain multi-wavelength transmission spectrum data; based on an optical absorption model of each thin film layer, chromatography decoupling operation is carried out on the multi-wavelength transmission spectrum data, and a target spectrum is separated; according to the film temperature monitored in real time, combining a preset material temperature optical constant database and setting a reference light path to carry out temperature compensation and baseline correction on the target spectrum; establishing a silver nanowire agglomeration spectrum model, performing second derivative calculation on the target spectrum after baseline correction, identifying spectrum characteristic peaks, and evaluating the agglomeration degree of the silver nanowires; and judging the degradation defect of the conductive network based on the agglomeration degree of the silver nanowires to obtain a defect detection result, and adjusting process parameters.

The invention relates to a tunable high-repetition-frequency high-power multi-wavelength optical pulse generation system, which belongs to the technical field of optoelectronic equipment and is structurally characterized in that the output end of a seed pulse source (1) is connected with the input end of a repetition-frequency multiplication module (2), and the output end of the repetition-frequency multiplication module (2) is connected with the input end of a shaping optical path module (3); the output end of the shaping light path module (3) is connected with the input end of the power amplification module (4), and the output end of the power amplification module (4) is connected with the input end of the pulse compression module (5); a multi-wavelength pulse seed source is designed by using a plurality of hybrid filters, and tunable multi-wavelength, high-repetition-frequency and high-power narrow pulse output is realized by using technologies such as an MZI-Sagnac hybrid repetition-frequency multiplication structure and the like.

The invention discloses a system and a method for realizing positive and negative weighting in an optical domain, and the system comprises a multi-wavelength light source array which provides multi-channel optical signals, and each wavelength corresponds to an input channel; the adjustable bias photoelectric modulator arrays are in one-to-one correspondence with the light sources, a quiescent working point is biased in a positive / negative slope linear region of a transmission curve through an independent bias circuit, positive and negative weight symbol control is realized, and an input electric signal is loaded; the multi-wavelength micro-ring weighting unit is used for weighting the modulated optical signal by regulating and controlling the transmissivity of the micro-ring; the photoelectric detection unit adopts a single-path detector to receive a composite optical signal and convert the composite optical signal into an electric signal; and the capacitor blocking and signal synthesis unit filters a direct current component, synthesizes an alternating current weighted signal and outputs a real number weighted sum. The system does not need to balance detectors and redundant devices, simplifies hardware architecture, reduces cost and size, reduces power consumption, improves weighting precision and reliability, supports flexible expansion of multi-wavelength channels, adapts to requirements of a large-scale optical neural network, and provides support for optical calculation integration and low-power-consumption landing.

Configurations are disclosed for multi-wavelength optical devices and systems. In particular, multi-wavelength optical devices that include separate chips optically connected via phonic wire bonds. The disclosed configurations can utilize photonic wire bond interconnects and photonic wire bond interconnection techniques, which may facilitate low-cost implementation of wavelength division multiplexed optical systems.

The invention discloses a sine frequency modulation harmonic error compensation method based on Bessel function modulation characteristics, and relates to the technical field of sine frequency modulation nonlinear parameter compensation and high-precision measurement of target absolute distance based on multi-wavelength interference. The problem that the constant phase demodulation precision is insufficient due to the fact that carrier harmonic waves, accompanying amplitude modulation and modulation depth errors cannot be effectively suppressed due to laser modulation nonlinearity in existing sine frequency modulation distance measurement is solved. According to the method, after sine frequency modulation interference signals are collected, high-pass filtering is carried out to remove low-frequency components, Hilbert transform is carried out to remove envelope suppression associated amplitude modulation, window function frequency mixing is carried out to extract modulation depth, a matched carrier containing second harmonics is constructed, and frequency modulation harmonic parameter optimization is achieved through baseband amplitude maximization. And finally, carrying out orthogonal demodulation on the compensated interference signal to obtain a high-precision constant phase. The method is suitable for high-precision multi-wavelength interference ranging, precision displacement measurement and optical metering systems.

The invention discloses a living blood vessel and lymph multi-parameter quantitative photoacoustic microscopic imaging system which comprises a high repetition frequency laser source, a photoacoustic scanning probe and a molecular imaging device. Through the cooperation of the multi-wavelength fast switching laser and the high-speed scanning probe, synchronous, dynamic and quantitative imaging of vascular function parameters and lymph concentration in a living tissue microenvironment is realized. The system has a video-level imaging rate and can capture a rapid biological process; through coaxial design of dispersion correction and a photoacoustic focus, high spatial resolution and high signal-to-noise ratio of a multispectral image are guaranteed; and the compact probe design realizes large-range scanning. The technology provides a powerful in-vivo visualization tool for research on life science problems such as tumor evolution and drug metabolism.

The invention discloses a multi-wavelength laser collimator based on radial shearing. The multi-wavelength laser collimator comprises a near-field reference, a telescope objective combination, a bifocal objective and an image detector which are sequentially arranged along a light path. Aberration-free imaging of near-field light beams is achieved through a bifocal objective lens, and meanwhile far-field pointing is detected through coaxial shearing interference generated by means of amplitude light splitting. A single non-mobile sampling detection light path and a single detection sensor are used to realize simultaneous acquisition of near-field position information and far-field pointing information of a laser beam; the light spot position deviation and the fringe translation amount are analyzed through a computer, and high-precision collimation is achieved through a feedback control system. And the detection of the angle direction of the laser beams with various wavelengths can be realized by using a radial shearing interference technology. The device breaks through the limitation of traditional double-optical-path collimation, has the characteristics of simple structure, strong anti-interference performance, multi-wavelength applicability and the like, remarkably improves the collimation precision, reduces the cost, and has important application value in the field of laser precision collimation.

The invention relates to the field of laser medical instruments, and discloses a spectrum detection-based multi-wavelength optical fiber laser treatment diagnostic machine, which comprises a power supply system, a laser module, a spectrum identification module, a control system, a display operation system and an optical fiber for coupling laser, and the power supply system is respectively connected with the laser module and the spectrum identification module. A treatment and feedback shared optical path structure is adopted, and coaxial transmission of high-power treatment laser and weak biological spectrum signals in the same optical fiber is realized by using an optical signal separation unit. Compared with a traditional technical scheme of an external independent probe, the structure does not need to add an additional intervention detection part, not only simplifies a handheld end operation mechanism, but also ensures that a spectrum collection view field and a laser thermal action area are highly overlapped in space, and the detection accuracy is improved. Therefore, the real biological physicochemical characteristics of the target tissue in the treatment process can be obtained in real time and in situ, and the judgment error caused by the deviation of the detection position is eliminated.

The invention relates to the technical field of ocean detection equipment, and particularly provides an ocean laser radar system and a seawater multi-parameter detection method. The system comprises a laser emission subsystem, an optical receiving subsystem and a signal acquisition and control subsystem. The laser emission subsystem can emit multi-wavelength pulse laser to seawater; the optical receiving subsystem adopts a double-receiving telescope structure, respectively receives scattering and fluorescence signals with different properties, and realizes multi-channel signal separation through light splitting, light filtering and polarization light splitting elements; and the signal acquisition and control subsystem realizes synchronous acquisition and processing of multi-channel data. The system can synchronously invert water optical parameters, water particulate matter depolarization ratio and color ratio, chlorophyll concentration, suspended load concentration and other multi-parameter profiles, and is suitable for marine environment unattended monitoring of a fixed platform and a mobile platform.

The invention provides a multi-gas sensing detection method and device based on microwave modulation FLRD, the multi-gas sensing detection device is built based on microwave modulation FLRD, and the method comprises the following steps: determining characteristic frequency and shortest switching time; establishing a multi-wavelength absorption physical model; a gas concentration vector is solved by adopting a regularization inversion algorithm, and regularization parameters are optimized through cross validation; and temperature compensation is realized through an adaptive Kalman filtering algorithm. Compared with a traditional time domain pulse measurement mode, the method can accurately obtain the intra-cavity ring-down time without a high-speed pulse light source and an oscilloscope. According to the method, a network vector analyzer is used for extracting a system transfer function, high-sensitivity and low-noise gas absorption measurement is realized, and the system cost and complexity are remarkably reduced. Parallel recognition of multiple gas components can be realized through frequency domain analysis and a regularization inversion algorithm; and the Kalman filtering algorithm with temperature compensation is combined, so that the measurement stability and the environmental adaptability are effectively improved.

The invention discloses a multi-objective optimization cooperative control method for goods shelf illumination and related equipment thereof, and belongs to the technical field of illumination control, and the method specifically comprises the steps: projecting a multi-wavelength grid detection pattern adaptive to the spacing of shelf laminates to the surface of a goods shelf, collecting a reflected light signal, and synchronously recording spatial distribution and spectrum composition data; extracting grid node coordinates by processing spatial data, calculating an offset vector relative to a reference position, analyzing spectral data to decompose wavelength components, and calculating a difference value between each wavelength light intensity and a reference value; generating a light beam direction adjustment instruction based on the direction amplitude of the offset vector, and generating a spectrum compensation instruction according to the light intensity difference, so that a basic illumination system adjusts illumination parameters accordingly; according to the invention, multi-parameter collaborative optimization of goods shelf illumination is realized, and the illumination quality in a complex environment is effectively improved.

The invention discloses a pure phase hologram coding method based on an unsupervised learning neural network, and belongs to the technical field of information optics, and the method comprises the steps: obtaining and preprocessing an original target image, taking the intensity of the original target image as the amplitude, and constructing a complex amplitude matrix through combining with an initial phase; randomly selecting parameters from the wavelength training table and the propagation distance training table, and propagating the complex amplitude matrix by adopting an angular spectrum diffraction algorithm to generate a complex amplitude hologram; inputting the hologram into a POH-Net deep neural network model, extracting features and mapping the features into a pure phase hologram; and according to the pure phase hologram, reconstructing an image by using reverse angular spectrum propagation, and optimizing network parameters by using an Adam optimizer by taking the loss between the amplitude of the image and the amplitude of the original target as a loss function until convergence. The method supports rapid pure phase hologram generation in complex scenes of multiple wavelengths, multiple distances and the like, and provides effective technical support for practical application of holographic display and a high-performance CGH system.

The utility model relates to a micro-fluidic flow cytometry fluorescence detector which comprises an excitation light source optical fiber, a light beam shaping module, a focusing and fluorescence collecting module and a micro-fluidic chip which are sequentially arranged along the excitation light path direction of the excitation light source optical fiber, and a multi-channel silicon photomultiplier tube is arranged above the micro-fluidic chip. A plurality of groups of detection channels for receiving fluorescence signals of different wave bands are arranged in the multichannel silicon photomultiplier tube at intervals up and down, and a dichroscope, a band-pass filter and a lens group are sequentially arranged in each group of detection channel along a light path and are gathered on a receiving chip; the micro-fluidic flow cytometry fluorescence detector can efficiently and accurately complete multi-wavelength fluorescence excitation and signal collection, and is suitable for multi-channel and multi-wavelength fluorescence detection requirements in a micro-fluidic chip.

The invention provides an optical fiber detection method and system for an optical time domain reflectometer, and relates to the technical field of power grids. According to the invention, the multi-wavelength backscattering signal of the optical fiber link to be detected is acquired, preprocessed and converted into the sample to be detected containing the multi-wavelength one-dimensional waveform data and the multi-wavelength two-dimensional diagram data at the same time, so that the sequence characteristic of the light intensity of each wavelength changing along with time is reserved; and spatial features of correlation and structural information between wavelengths can be reflected through data conversion construction, and multi-dimensional and structured representation of optical fiber events is realized. And combined analysis and recognition are carried out by combining a fault recognition model, and a time sequence rule in a one-dimensional waveform and a spatial distribution mode in a two-dimensional diagram are cooperatively mined, so that deep fusion and intelligent analysis of optical fiber fault spatial-temporal characteristics are realized, and the recognition capability of a complex fault mode is improved. The technical problem of low accuracy of optical fiber fault detection with a single wavelength at present is solved, and the accuracy and reliability of optical cable line fault detection are improved.

The invention discloses a multi-wavelength dynamic interferometer measurement error correction method, and relates to the technical field of interference measurement, and the method comprises the steps: collecting a multi-wavelength interferogram; based on ideal interference light intensity distribution, background light intensity fitting, removal, light intensity adjustment distribution fitting and amplitude normalization are completed through polynomial fitting, and the problem of uneven light intensity distribution is corrected; carrying out Lissajous figure phase correction; adopting an AIA iterative algorithm to extract a single-wavelength phase, and then calculating phase information corresponding to a synthetic wavelength through a multi-wavelength synthesis algorithm; and carrying out dimension reduction on the surface shape data by adopting a PCA method, calculating a mahalanobis distance and removing abnormal signals, and averaging the original surface shape of the reserved data to obtain a final surface shape. According to the method, a polynomial fitting and Lissajous figure fitting double correction technology and a principal component analysis and mahalanobis distance anomaly elimination technology are combined as the core, the problems of phase shift errors, uneven light intensity, multi-wavelength synthesis error amplification and the like are solved in a targeted mode, and full-automatic high-precision measurement error correction is achieved.

The invention belongs to the technical field of atmosphere detection remote sensing, and discloses an atmosphere multi-element integrated multi-wavelength coherent differential absorption laser radar system. Lambda on1 wavelength laser generated by the first frequency stabilization seed laser, lambda on2 wavelength laser generated by the second frequency stabilization seed laser and lambda off wavelength laser generated by the third frequency stabilization seed laser are transmitted to the switching module for time domain modulation to obtain an output signal, and the output signal is decomposed into local oscillation light and a main signal by the first coupler. A main signal is modulated by the pulse modulator, amplified by the amplification module and then transmitted to the optical transceiver module, backward scattered light scattered by the atmosphere is transmitted to the second coupler and is subjected to coherent coupling and equalization with local oscillation light, and coherent electric signals are transmitted to the data analysis module through the balance detector to be analyzed. The water vapor concentration, the wind speed and the atmospheric temperature in the propagation path are obtained. Through the coherent detection technology, the signal-to-noise ratio of signals is remarkably improved, and high-precision atmospheric humidity and wind field detection is achieved.

The invention relates to the technical field of optical interference measurement, in particular to a synchronous wavelength phase-shifting interference measurement system. According to the scheme, a laser set outputs multiple narrow-linewidth light beams with nm-level wavelength spacing, and the multiple narrow-linewidth light beams are combined through a wavelength division multiplexer and then enter an interference light path to generate multi-wavelength interference fringes. The metasurface achieves separation of interference fringes of all wavelengths through a sub-wavelength structure array, a detector synchronously captures light intensity data of the interference fringes of all the wavelengths in a single frame mode, and then phase distribution can be directly calculated through single-frame multi-wavelength light intensity. According to the system, mechanical phase shifting and polarization control assemblies are eliminated, the defects that a traditional wavelength phase shifting interference measurement technology is poor in environmental adaptability and a traditional synchronous phase shifting technology has polarization errors are overcome, and a high-precision and high-environmental-adaptability dynamic measurement scheme is provided for optical manufacturing.

The invention provides a test paper identification and result interpretation method and system based on a multi-wavelength light source and a medium. Firstly, coordinate positions of a type identification area, a control line area and a detection line area on test paper are accurately positioned; irradiating the type identification area according to a preset sequence, calculating a reflected light ratio and a difference value of a specific wavelength combination, and comparing the reflected light ratio and the difference value with a preset threshold value to automatically judge the type of the test paper; selecting a corresponding wavelength light source to irradiate a control line region according to the type of the test paper, and starting multi-wavelength scanning to generate a dynamic judgment threshold when the intensity of reflected light is lower than a preset first reflected light threshold; and finally, detecting the detection line area by adopting a type adaptive wavelength, and outputting a final interpretation result by comparing the reflected light intensity with a dynamic threshold value. Through the multi-wavelength optical feature recognition and dynamic threshold technology, automatic distinguishing of test paper types and accurate interpretation of detection results are achieved, and the adaptability, accuracy and reliability of a detection system are improved.

This invention discloses a multi-wavelength Brillouin and Raman random fiber laser based on tunable broadband Raman pumping, comprising a 1.5μm Brillouin pump, a 1.45μm tunable broadband Raman pump, a wavelength division multiplexer (WDM) I, and a passive fiber. The 1.45μm tunable broadband Raman pump includes a wavelength-tunable cascaded random Raman fiber laser, a WDM II, and a single-mode fiber I. The wavelength-tunable cascaded random Raman fiber laser is injected into the single-mode fiber I through the WDM II. This multi-wavelength Brillouin and Raman random fiber laser based on tunable broadband Raman pumping provides a 1.45μm tunable broadband Raman pump source by back-Raman amplification of the broadband seed light. Working together with the 1.5μm Brillouin pump, it can achieve ultra-wideband multi-wavelength random fiber laser output. By simultaneously tuning the output wavelengths of the Brillouin pump and the Raman pump, wavelength tuning of the broadband multi-wavelength random fiber laser can be achieved.

The invention relates to a three-dimensional fluorescence tomography imaging device, which comprises a shooting part, an image processing part, a plurality of exciting light emitting parts, a tomography light emitting part, a first reflecting mirror, a beam splitter, a second reflecting mirror, a multi-wavelength light source part and a wavelength adjustable light filter, the image processing part calculates the depth corresponding to each fluorescent image according to the depth information in the optical coherence tomography image, and combines each fluorescent image according to the depth to form a three-dimensional fluorescent tomography image of the shooting object corresponding to the first fluorescent developing agent.

The utility model belongs to the technical field of optical fiber lasers, and relates to a multi-wavelength random optical fiber laser based on a four-port circulator and Brillouin-Rayleigh scattering, which is a closed-loop random optical fiber laser and comprises the four-port circulator, a seed laser is connected with the first port of the four-port circulator, and a seed laser is connected with the second port of the four-port circulator. The second port is connected with the Brillouin gain optical fiber, the third port is connected with the random Rayleigh scattering optical fiber, and the fourth port is connected with the optical fiber coupler; an erbium-doped fiber and a wavelength division multiplexer are connected between the Brillouin gain fiber and the fiber coupler, and a pump light port of the wavelength division multiplexer is connected with an output port of the 980nm laser. According to the utility model, the Brillouin gain optical fiber is subjected to Brillouin scattering, and the Rayleigh scattering of the random Rayleigh scattering optical fiber and the gain amplification of the erbium-doped optical fiber are combined, so that efficient and stable multi-wavelength output is realized, the number of output wavelengths is adjustable, the stability is high, and the device is suitable for a high-precision optical fiber sensing and dense wavelength division multiplexing system.

This invention belongs to the field of food or beverage processing technology, specifically relating to an intelligent evaluation and brewing control system for tea infusion quality based on multi-source sensor fusion. The system uses a multi-wavelength optical sensor array and distributed temperature sensors to acquire spectral absorption peak shift characteristics and temperature gradient vectors, respectively, and then concatenates them to construct a three-dimensional tensor containing time, spatial height, and wavelength dimensions. This three-dimensional tensor is input into a spatiotemporal graph convolutional network. Its spatial graph convolutional layer extracts spatial features using temperature nodes at different height levels as vertices and thermal conduction physical relationships as edges; the temporal convolutional layer extracts temporal features; and the fully connected layer outputs the predicted solute release rate and the deviation value of the target temperature gradient. The controller generates pulse-width modulation signals based on the deviation values ​​to adjust the heating plate power and the timing of the water injection valve. This invention jointly analyzes heat distribution and solute concentration changes, and corrects control commands based on the physical release state of the solute, ensuring that temperature field changes match solute diffusion.

This application discloses a method and system for synchronous testing of metasurface grating waveguide performance, relating to the field of metasurface grating technology. The method includes polarization state modulation and spatial frequency encoding of multi-wavelength incident beams to obtain a modulated incident light field; coupling this modulated incident light field into the metasurface grating waveguide under test, which then undergoes total internal reflection to form the outgoing light field; acquiring a raw dataset of the entire light field, including Stokes polarization images and spatial spectrum images corresponding to each wavelength of the outgoing beam; calculating the total internal reflection hop count based on the Stokes polarization image; calculating the spatial step size offset based on the spatial spectrum image; and establishing a mapping relationship between the image pixel coordinates of the raw dataset and the internal physical regions of the metasurface grating waveguide under test to obtain local diffraction efficiency distribution data. This application solves the problem that traditional outgoing end intensity testing is difficult to trace to local defects inside the waveguide, achieving synchronous, high-precision quantitative characterization of local diffraction efficiency across multiple wavelengths.