583 results about "Dual wavelength" patented technology

The invention discloses an appearance visual detection method and device for an electric control part of a new energy automobile. Structural stress distribution data of the electric control component are obtained and subjected to partition processing, and the surface of the electric control component is divided into a stress sensitive area and a conventional area; carrying out multi-wavelength spectrum scanning and polarization state detection on the stress sensitive area by adopting self-adaptive path planning, synchronously acquiring a polarization characteristic matrix, dual-wavelength interference data and depth spectrum data of the determined key attention area, and carrying out time domain synchronization and space registration processing to generate multi-dimensional detection characteristic data; extracting an optical anisotropy coefficient, a microcosmic deformation tensor and an interface reflection feature vector, and determining layering defect feature parameters in combination with multiple threshold judgment; and calculating local curvature distribution, an interface shear stress field and thermal stress distribution, and performing quantitative matching with the material characteristic parameters to generate quantitative evaluation indexes of the layering defects. According to the invention, accurate identification and rapid positioning of microscopic layering defects in the multi-layer composite insulation structure of the electric control component are realized.

The invention relates to the technical field of laser, in particular to a dual-wavelength narrow-linewidth laser output device and method.The dual-wavelength narrow-linewidth laser output device comprises a semiconductor laser unit emitting linearly polarized light beams, and a light beam conversion lens is used for achieving conversion of semiconductor laser fast-axis light beams and semiconductor laser slow-axis light beams; the light beam conversion lens is used for collimating and compressing a semiconductor laser fast axis divergence angle, and the slow axis collimating lens is used for collimating and compressing a semiconductor laser slow axis divergence angle; the linearly polarized light beam is divided into a first light beam and a second light beam through the rectangular prism; the first light beam sequentially passes through a first volume Bragg grating, a first reflector, a half-wave plate and a polarization beam combiner; the second light beam sequentially passes through a second volume Bragg grating, a second reflector and a polarization beam combiner; the dual-wavelength narrow-linewidth semiconductor laser can solve the problems of precise regulation and control and power amplification of the central wavelength of the dual-wavelength narrow-linewidth semiconductor laser, has power expansibility, and realizes improvement of laser power by stacking a plurality of laser units in the vertical direction.

The invention belongs to the technical field of water treatment and wastewater treatment, and provides an ultraviolet-ozone water disinfection device and method for cooling a lamp tube and synchronously generating ozone. The water disinfection device comprises an electrodeless ultraviolet disinfection unit, a synchronous cooling ozone generation unit, an ozone disinfection unit and a control unit, the electrodeless ultraviolet disinfection unit comprises a microwave generator, a waveguide, a microwave resonant cavity and a 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube, and the synchronous cooling ozone generation unit comprises an air blower, an air inlet pipe, an air outlet pipe, a quartz sleeve and oxygen supply equipment. The ozone disinfection unit comprises a microporous aeration disc, and the control unit comprises a control box, a temperature sensor, an electromagnetic valve and an ozone concentration monitor. According to the invention, the dual-wavelength ultraviolet lamp tube is cooled by using large-flow air or air / oxygen mixed gas, and ozone is synchronously and efficiently generated, so that an ultraviolet-ozone combined water disinfection process is constructed, the promotion effect of ozone on water disinfection is fully utilized, the water disinfection effect is enhanced, and the applicability of the method to water bodies with different water qualities is improved.

The invention provides a molten pool temperature field in-situ monitoring method and system based on multi-view light field imaging, and the method employs a light field camera multi-view system, obtains molten pool images of R, G and B channels through building a light field sub-aperture Bayer model, and calibrates the relative spectral responsivity of a light field camera and the proportion of dual-wavelength intensity under a coaxial temperature measurement system. Molten pool images of two channels are selected from the molten pool images of the R channel, the G channel and the B channel, calibration parameters are combined, and a molten pool temperature field is derived through a dual-wavelength temperature measurement method. A blackbody furnace is adopted to calibrate a multi-view light field temperature measurement system, and the error of a monitored temperature field is kept below 3%. The method simplifies the monitoring process, improves the temperature measurement precision, has a wide temperature range and low complexity, can perform in-situ monitoring on the high-temperature metal molten pool, and has a wide application prospect in the field of additive manufacturing.

The invention is suitable for the technical field of intelligent wearable devices, and provides a blood pressure dynamic calibration method and device of an intelligent wearable device and the wearable device. According to the blood pressure dynamic calibration method of the intelligent wearable device, the dual-wavelength pulse wave signal collected by the dual-wavelength PPG sensor is obtained, differential processing is conducted on the dual-wavelength pulse wave signal, the purified pulse wave signal is obtained, the signal-to-noise ratio of the purified pulse wave signal is calculated, and when the signal-to-noise ratio is higher than the threshold value, the blood pressure dynamic calibration of the intelligent wearable device is completed. Extracting a pulse wave characteristic value from the purified pulse wave signal, iterating the vascular elasticity coefficient according to the pulse wave characteristic value to obtain an iterative vascular elasticity coefficient, and outputting a first calibrated blood pressure value according to the pulse wave characteristic value and the iterative vascular elasticity coefficient. According to the embodiment of the invention, motion artifacts are effectively suppressed through differential processing of the dual-wavelength PPG sensor, the signal-to-noise ratio of signals is increased, and the problem that the blood pressure measurement error is large due to noise interference and blood vessel elastic fixation when a traditional intelligent wearable device is in a motion state is solved.

The invention relates to the technical field of gas detection, in particular to a dual-wavelength-based adaptive methane detection method and system, and the method comprises the following steps: collecting environmental interference characteristics of a to-be-detected gas environment in real time; synchronously emitting a first laser beam and a second laser beam to a to-be-detected gas environment according to the tunable laser source; receiving optical signals of the first laser beam and the second laser beam and converting the optical signals into electric signals; calculating a light intensity difference value of the first laser beam and the second laser beam based on the electric signal to generate a differential absorption signal; performing optical differential compensation on the differential absorption signal, outputting a methane concentration value, and performing environmental drift compensation on the methane concentration value based on environmental interference characteristics; and performing real-time threshold value judgment on the methane concentration value, and if the methane concentration value exceeds a preset threshold value, triggering a local early warning signal. According to the invention, the problem that the detection precision is reduced due to the fact that methane absorption signal common-mode noise and absorption coefficient drift cannot be synchronously inhibited due to dust concentration and temperature and humidity interference in a dynamic complex environment under a mine is effectively solved.

The invention relates to the technical field of optical instruments, and discloses a visible-ultraviolet dual-wavelength microscope objective and an optical system.The visible-ultraviolet dual-wavelength microscope objective comprises a first lens set with positive focal power and a second lens set with negative focal power which are sequentially arranged from the object plane to the image plane of the microscope objective in the optical axis direction of the microscope objective; the second lens group comprises a front group with negative focal power, a middle group with positive focal power and a rear group with positive focal power; the microscope objective also comprises an aperture diaphragm; the aperture diaphragm is positioned between the two adjacent lenses in the middle group; according to the microscope objective, through reasonable matching of the positive focal power and the negative focal power, the influence of chromatic aberration under a wide-spectrum light source is effectively reduced, the high numerical aperture and the large view field characteristic are kept, and the microscope objective can adapt to the wide-spectrum ultraviolet laser wavelength.

The invention provides a dual-wavelength tunable all-solid-state mid-far infrared laser, relates to the technical field of lasers, and is used for solving the technical problems that high-performance dual-wavelength 3 [mu] m waveband laser and mid-far infrared waveband laser generated by pumping of the high-performance dual-wavelength 3 [mu] m waveband laser are difficult to obtain in the prior art. The middle and far infrared laser comprises an erbium-doped laser and an optical parametric oscillator, the erbium-doped laser is used for providing dual-wavelength 3-micron wave band pulse laser, and the erbium-doped laser comprises a pumping source, an erbium-doped laser medium, a gain modulator, a high reflective mirror and an output mirror; the optical parametric oscillator is used for obtaining medium-wave infrared laser and long-wave infrared laser which are output in a dual-wavelength mode under the pumping effect of the dual-wavelength pulse laser in the 3-micron wave band. The mid-far infrared laser is simple in structure and convenient to use, can obtain tunable dual-wavelength mid-far infrared pulse laser with high beam quality, and meets the light source requirements of differential absorption of toxic gas telemetering of laser radar and photoelectric countermeasure.

The invention discloses an optical adhesive with dynamic bond exchange and gradient curing functions and a preparation method thereof, relates to an optical adhesive, and aims to solve the problems of interface failure and light transmission attenuation which are easy to occur in the existing optical adhesive. The invention starts from the following three points: 1, two-stage dynamic covalent cross-linking: 1, UV (ultraviolet) initiates acrylate polymerization to form a main network; part of unreacted epoxy groups are retained. 2, thermally activating dynamic boric acid ester bond exchange to realize network reconstruction and stress release; 2, a dual-wavelength gradient initiation system: a 365nm UV curing surface and a 405nm LED penetrate through a curing deep layer to avoid an uncured layer caused by oxygen inhibition; 3, a nano composite anti-reflection technology: mesoporous SiO (at) TiO core-shell nanoparticles (refractive index gradient matching) improve the light transmittance to gt; the content is 99.5%.

The invention provides a dual-wavelength smoke temperature composite fire detector and a detection method. The dual-wavelength smoke temperature composite fire detector comprises an infrared transmitting device, a blue light transmitting device, a 1 # light receiving device and a 2 # light receiving device, a thermistor is also included; optical axes of the infrared transmitting device, the blue light transmitting device, the 1 # light receiving device and the 2 # light receiving device are intersected at one point, the 1 # light receiving device receives forward scattered light of smoke particles to the infrared transmitting device and backward scattered light of the smoke particles to the blue light transmitting device, and the 2 # light receiving device receives backward scattered light of the smoke particles to the infrared transmitting device; and forward scattering light of the smoke particles to the blue light emitting device; the thermistor obtains environment temperature information; and identifying the type of the smoke according to the forward and backward scattering characteristic data of the smoke under the dual wavelengths and the environment temperature. According to the invention, functions of smoke detection and temperature detection are combined, and accuracy and reliability of fire detection are greatly improved by monitoring fire characteristic parameters of smoke and temperature at the same time.

The invention relates to the technical field of vegetation root system nondestructive testing, in particular to a multispectral vegetation root system identification system and method based on a differentiable physical engine, and the system comprises a multispectral LiDAR module which is used for transmitting near-infrared laser and short-wave infrared laser, scanning a target area, obtaining dual-wavelength reflectivity data, and determining the vegetation root system according to the dual-wavelength reflectivity data; generating a reflectivity ratio matrix by adopting a reflectivity ratio classification model; the differentiable physical engine is used for quantizing the dynamic relationship between the vegetation root growth rate and the soil resistance by adopting a coupling model according to the reflectivity ratio matrix, generating a physical model and updating the physical model at a preset time interval; and the data processing and three-dimensional modeling module is used for generating a three-dimensional root system model and a health assessment result according to the reflectivity ratio matrix and the physical model, and outputting the three-dimensional root system model and the health assessment result. According to the scheme, soil penetration and root system and foreign matter distinguishing can be carried out, the vegetation native environment is not damaged, dynamic monitoring analysis is carried out, and the accuracy of recognition analysis is improved.

The invention discloses a dynamic leaching-spectrophotometric detection method for the release rate of nutrients in a slow-release fertilizer, and relates to the field of agrochemical analys.The detection method comprises the following steps that S1, a slow-release fertilizer sample is placed in a leaching column to be leached, and leachate is collected; s2, sequentially adding a masking agent solution and a chromogenic reagent into the leachate, and carrying out chromogenic reaction; s3, pumping the solution into a double-optical-path flow cell, and measuring absorbance values under a target nutrient characteristic absorption wavelength and a background interference characteristic wavelength; s4, calculating the corrected net absorbance; and S5, calculating the nutrient concentration, and drawing a nutrient release kinetic curve. By adopting a dual-wavelength synchronous detection and real-time dynamic subtraction correction algorithm, the method can eliminate system errors of time-varying background chromaticity, so that accurate and reliable absorbance readings can be obtained at the initial stage of nutrient release even if the nutrient concentration in the leachate is very low, thereby ensuring the authenticity of the initial stage of a release curve and improving the accuracy of nutrient release. And initial release kinetic parameters are accurately captured.

The invention discloses a diffraction neural network optical classification method and system based on dual-wavelength differential modulation, and relates to the technical field of optical calculation and optical information processing, and the method comprises the steps: S1, optimizing the phase distribution of a single diffraction layer through a deep learning back propagation algorithm; s2, loading a code corresponding to the input information through an input layer; s3, introducing two coherent light sources with different wavelengths to irradiate the codes in sequence or in parallel; s4, after the single diffraction layer modulates the input light field, an output light field is detected through a detector; and S5, performing differential normalization operation on the light intensities of different wavelengths to obtain a discrimination signal Sc of each category, and completing optical classification. According to the invention, the adjustment error caused by a multilayer device is eliminated through a single-layer diffraction structure, a dual-wavelength differential detection mechanism is introduced, and the non-negativity limitation of a light intensity signal is broken through, so that the classification precision and robustness are remarkably improved while the structure simplification is ensured, and the method has important engineering value and application prospect.

The embodiment of the invention provides a flip chip offset measurement system and method, the measurement system comprises a first light source and a second light source which are different in emergent light beam wavelength, an imaging assembly and a processing assembly, and the first light source is controlled to emit a first light beam which penetrates through a flip chip and irradiates a first target in a deep layer; obtaining a first image containing the first target from the first detector; controlling a second light source to emit a second light beam to irradiate a second target on the surface of the flip chip, acquiring a second image containing the second target from a second detector, and finally acquiring a first offset and a second offset of the flip chip relative to the substrate based on the first image and the second image by a processing assembly, and obtaining the bonding offset of the flip chip according to the first offset and the second offset. According to the invention, the dual-wavelength light source is adopted to cooperatively irradiate the flip chip in a time-sharing / wave-band-sharing manner, so that the penetrability-reflectivity contradiction of single-wavelength detection is broken through, and the accuracy and reliability of lamination offset detection are improved.

The invention discloses a polydimethylsiloxane sensitization optical fiber temperature and strain simultaneous measurement sensor. The sensor comprises an incident optical fiber, an optical fiber coupler, an optical fiber patch cord, a transmission optical fiber, a sensing cavity, a reference cavity and an emergent optical fiber, an optical signal enters the optical fiber coupler through the incident optical fiber and is divided into two beams of equal-intensity light in the coupler, the two beams of light are respectively input into the transmission optical fiber through the optical fiber patch cord and then enter the sensing cavity and the reference cavity which are coated with the polydimethylsiloxane, and the light is reflected by the cavities to form interference; the interference light is transmitted back to the optical fiber coupler through respective transmission optical fibers, so that a vernier spectrum is formed; the emergent optical fiber transmits an optical signal containing temperature strain information to a spectrograph, trough drift is analyzed through a dual-wavelength matrix demodulation method, and simultaneous measurement is achieved. By combining the vernier effect, the structural advantages of the Fabry-Perot interferometer and the advantage of high thermo-optical coefficient of the polydimethylsiloxane, the invention has the advantages of low cost, high sensitivity, high stability and the like.

The invention relates to the technical field of optical instruments, and discloses a visible-ultraviolet dual-wavelength projection objective lens and an optical system. Comprising a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power and a fourth lens group with positive focal power which are sequentially arranged along the optical axis direction from the object plane to the image plane of the projection objective lens; the projection objective lens further comprises an aperture diaphragm, and the aperture diaphragm is located between two adjacent lenses in the third lens group. Through arrangement of the four lens groups and reasonable matching of positive and negative focal powers, effective correction of chromatic aberration is realized, the imaging quality of the optical system is excellent, and the optical system can be adapted to a high-power large-linewidth deep ultraviolet band light source.

The invention relates to a dual-wavelength vortex light interference displacement measurement system and a dual-wavelength vortex light interference displacement measurement method for compensating installation and adjustment errors through image recognition, and belongs to the technical field of optical precision measurement of precision measurement. Comprising a laser light source A, a beam expander A, a collimating mirror A, a vortex wave plate A, a laser light source B, a beam expander B, a collimating mirror B, a vortex wave plate B, a beam splitter prism A, a reflector A, a reflector B, a beam splitter prism B, a reflector C, a displacement table and a camera. An image recognition method is used for processing a dual-wavelength vortex light interferogram, displacement calculation is carried out according to the overall intensity change distribution of the interferogram, and different from traditional angle recognition extraction, the method is used for solving the problem that a measurement result is affected by system errors existing in a measurement system. The traditional angle identification precision is reduced due to interference pattern distortion, so that the measurement precision is influenced, the error influence is effectively reduced, the accuracy of the measurement result is ensured, and the micro-displacement measurement method is novel, effective, high in precision and large in range.

The invention belongs to the technical field of ultrasonic Doppler blood flow imaging, and particularly relates to a three-dimensional ultrasonic vector Doppler imaging method based on a row-column addressing array. According to the method, three-dimensional ultrasonic vector Doppler imaging is realized by combining a high-frame-rate two-dimensional non-focused wave emission sequence and a row-column addressing array (RCA) of a least square multi-angle Doppler velocity estimator; the method specifically comprises the following steps: acquiring radio frequency data from each oblique non-focused wave emission, and then performing IQ demodulation, beam forming and clutter filtering; performing high-frame-rate multi-angle vector Doppler analysis and speed estimation on a result through RCA; and dual-wavelength anti-aliasing processing is carried out. According to the invention, the imaging speed of more than thousands of frames can be realized, the sensitivity to low-speed flow and the measurement accuracy to high-speed flow are obviously improved, and clinical environment experimental verification is carried out; the method is suitable for clinical application, especially for blood flow dynamic monitoring of large blood vessels, and important support can be provided for blood flow dynamic research and clinical diagnosis.

The invention discloses a wavelength and polarization multiplexing super-structure lens construction method based on a double-layer geometric phase, and provides a double-layer geometric phase super-structure surface theoretical model by using a super-structure based on an artificial micro-nano structure, and designs a lens structure of which two working wavelengths and two polarization modes can be regulated and controlled at will by using the model. The working principle of the double-layer geometric phase super-structure lens is elaborated; secondly, optimizing and screening unit structures of the single-layer super-structure lens, establishing a unit structure database, and designing a double-layer super-unit structure on the basis of the unit structures; and finally, a double-layer super-structure lens is constructed by using a super-unit structure, so that the double-layer super-structure lens works at two wavelengths and two polarization states, and the adjustable multifunctional characteristics of dual-wavelength switchability and polarization sensitivity are realized. The method has important application prospects in the fields of dual-wavelength polarization sensitive imaging, optical tomography, sensing, new energy automobile display systems, AR / MR display and the like.

The invention provides a multi-channel parallel structure interference optical system and an interference measurement method, and the system comprises a multi-channel parallel light source array which comprises a plurality of independently modulated sub-light sources, each sub-light source at least comprises dual-wavelength output, and generates an angle integral illumination light beam which forms an angle theta with a main optical axis through a micro-concave lens or an optical steering device, spatial incoherent illumination is realized; the interference light path module is used for dividing the light beam from the multi-channel parallel light source array into a scene arm and a reference arm and generating an interference light signal; the compound eye sensor array comprises a plurality of monocular sensors, each monocular is in one-to-one correspondence with the sub light sources of the multi-channel parallel light source array, and each monocular of the compound eye sensor array correspondingly receives an interference light signal from one sub light source and outputs an interference pattern; the problems that a traditional single-channel interference system is low in detection efficiency and poor in environmental adaptability are solved, and high-precision, wide-range and anti-interference multi-physical-quantity synchronous measurement is achieved.

The invention provides a remote sensing water depth detection method, medium and system based on blue-green laser, and belongs to the technical field of water depth measurement, and the method comprises the steps: firstly, obtaining blue and green laser signals with known transmitting power, and collecting water surface reflection and water bottom reflection data under different incident angles; based on the data, a laser incident angle matrix is established, and a water surface reflection coefficient and a water surface transmission coefficient are calculated. Meanwhile, an atmospheric transmission matrix is established according to the meteorological parameters, and the transmission loss of the laser signal in the atmosphere is calculated. Then, a water surface fluctuation model is established, and water surface reflection and water bottom reflection signals are separated; and establishing a water depth calculation equation set by using the blue-green dual-wavelength signal intensity ratio matrix and combining with the optical characteristics of the water body. And finally, according to the propagation time difference and the equivalent propagation speed of the laser signal in water, solving a water depth equation set, and finally obtaining a water depth topographic map. The problem that in the prior art, a water surface reflection signal and a water bottom reflection signal cannot be separated, and the measurement precision is affected is solved.

The invention relates to the technical field of bridge load tests, and provides a bridge load test crack increment change observation method and system, and the method comprises the steps: collecting prestressing tendon circumferential strain distribution data and dual-wavelength strain response data; calculating an interface bonding stiffness change parameter; pre-stress modulation effect compensation and polar coordinate system conversion are carried out on the strain response data and the rigidity change parameters, and micro-crack characteristic signals are obtained; load data and beam group arrangement parameters are collected, and a micro-crack propagation prediction model is established in combination with the interface bonding stiffness change parameters; inputting the micro-crack characteristic signal into a micro-crack propagation prediction model, and outputting a micro-crack development trend prediction result; and adjusting sampling parameters of a dual-wavelength time division multiplexing algorithm and characteristic extraction parameters of prestress modulation effect compensation according to a micro-crack development trend prediction result. According to the invention, the precision of observing the increment change of the micro-crack in the bridge load test is improved, and the automatic monitoring and prediction of the micro-crack of the prestressed concrete bridge are realized.

The present invention provides a laser protection glass applicable to dual wavelengths of 0.53 μm and 1.06 μm and a preparation method thereof, belonging to the technical field of preparation of protection glass. The laser protection glass is borosilicate glass, comprising the following components: SiO2 35-47%, Al2O3 1-3%, B2O3 9-13 wt%, Na2O 7-10 wt%, CaO 3-5 wt%, ZnO 3-4 wt%, ZrO2 0.5-1.5 wt%, Er2O3 8-20 wt%, Sm2O3 9-16 wt%. The present invention also provides a preparation method of the laser protection glass applicable to dual wavelengths of 0.53 μm and 1.06 μm. By optimizing the glass components and the melting and annealing processes, the present invention reduces the cracking of the glass generated in the heat treatment process and realizes the protection effect of the glass material at 0.53 μm and 1.06 μm.

The present invention includes methods for reducing photoexcitation of a photoswitchable photoinitiator in volumetric printing including a volume of a photohardenable composition at locations in the volume at which intersection of two wavelengths does not occur; methods of three-dimensional (3D) printing including dual-wavelength photoexcitation of a photohardenable composition included in a volume, the method including photoexcitation by a modified or controllably-sized light sheet including a first wavelength and an optical projection including a second wavelength; and methods for extending the reuse-printing lifetime of a photohardenable composition including a photoswitchable photoinitiator. Preferably the photohardenable composition includes the dual-wavelength photoinitiator and a photohardenable resin component. The present invention also includes a photohardenable composition including a photoswitchable photoinitiator with an improved reuse-printing lifetime.

The invention belongs to the technical field of medical treatment, and particularly relates to a hemoglobin chyle joint detection device and a detection method.The hemoglobin chyle joint detection device comprises a shell, an analysis mechanism is arranged in the shell, and a colorimetric tube is inserted into the upper surface of the shell; the analysis mechanism comprises a light source module, a sample processing module, an optical detection module and a data processing module; the optical detection module synchronously acquires absorbance signals under two wavelengths through double detectors; the data processing module calculates hemoglobin concentration and chyle degree based on the dual wavelength absorbance values. The method is different from traditional single-index detection, two-parameter synchronous analysis of hemoglobin and chyle is achieved for the first time, and the preliminary screening efficiency before blood donation is remarkably improved. By adopting a dual-wavelength correction algorithm, the influence of residual absorption interference of hemoglobin at 580-700nm on chyle index determination is eliminated, and the influence of absorption interference of chyle at 480-570nm on hemoglobin determination is eliminated. The method is suitable for rapid screening on a blood sampling site to realize informatization management of detection data.

The invention discloses an fNIRS adaptive feedback emotion cognition cooperative training device and method, and relates to the technical field of emotion disorder cognition training. The device comprises a data acquisition module used for acquiring an original dual-wavelength light intensity signal from a brain; the data processing module is used for performing multi-stage preprocessing on the original dual-wavelength light intensity signal; the neural feedback module is used for calculating a multi-dimensional evaluation index according to the hemoglobin concentration data and adjusting a difficulty level and a feedback threshold value of a training task by using a dynamic threshold value control algorithm; the training module is used for training participants based on the emotion stimulation task and the cognitive training task; and the evaluation module is used for performing training evaluation according to the comparison result of the comprehensive performance score and the feedback threshold. Brain function equipment is closely combined with cognitive training and emotion stimulation tasks, dynamic evaluation and real-time feedback are added for traditional tasks, and through the brain network analysis technology, accurate evaluation of the user training effect is achieved.

The invention relates to the technical field of fire early warning, in particular to a fire extinguishing system based on a multi-modal sensor and a multi-stage linkage control method.The fire extinguishing system based on the multi-modal sensor comprises a multi-spectral light source module, the multi-spectral light source module is configured to emit a dual-wavelength light beam with a preset divergence angle, the first wavelength # imgabs0 # is located in the visible light wave band, and the second wavelength # imgabs1 # is located in the near-infrared wave band; a temperature gradient sensor array and a scattering angle adjustable photoelectric detector array are arranged in the composite detection cavity, the temperature gradient sensor array comprises miniature thermocouple groups which are distributed in a spatial orthogonal manner, and the photoelectric detector array comprises a multi-angle receiving unit which can slide along a spherical track; the matrix eliminates coupling interference of a temperature field on scattering characteristics of smoke particles through a dual-wavelength phase locking algorithm; according to the scheme, the dynamic coupling interference of the temperature field and the scattering characteristic can be fundamentally solved.

The invention belongs to the technical field of displacement measurement and optical precision measurement, and particularly relates to a grating splicing system based on dual-wavelength far-field diffraction pattern image centroid analysis, a beam splitter is arranged in the light path direction of a first laser, the beam splitter is arranged in the light path direction of a second laser, and the beam splitter is arranged in the light path direction of a third laser. The first laser is provided with a beam expanding and collimating system in the transmission light path direction of the beam splitter, and the second laser is provided with a beam expanding and collimating system in the reflection light path direction of the beam splitter. According to the invention, the two small-breadth gratings are subjected to multi-dimensional precise splicing through devices such as double lasers, a beam splitter prism and a precise electric displacement table, the 0-order far-field diffraction light and the 1-order far-field diffraction light of the spliced gratings are respectively imaged through two electric coupling elements, and the mass center coordinates of light spots in the images are extracted and analyzed, so that the imaging precision of the small-breadth gratings is improved. And different-dimensional splicing errors between the two gratings are obtained, so that a multi-dimensional grating precise splicing function is realized.

The invention provides a detection device for a density gradient centrifugal sample, and belongs to the technical field of detection devices. The device comprises a sample suction platform mechanism which is used for sucking layered samples to be detected in a centrifugal tube layer by layer and conveying the layered samples to a sample detection chamber of an optical detector mechanism; the optical detector mechanism is provided with a xenon lamp light source and a beam shrinking light path system and supports 200-1100 nm full-wavelength detection; and the automatic collecting platform mechanism is used for sub-packaging the samples detected by the optical detector mechanism. According to the invention, a separation system and a collection system are integrated into a continuous process, so that man-made interference is reduced, and the resolution ratio and efficiency are improved. The xenon lamp light source and the beam shrinking light path system are adopted, the detection precision and stability are improved based on the spectrophotometer principle, the detection wavelength can be freely selected, and the limitation of traditional dual wavelengths is broken through.

The invention discloses a dual-wavelength mode-locked laser generating device and a dual-wavelength mode-locked laser generating method, and belongs to the technical field of optical communication, and the dual-wavelength mode-locked laser generating device comprises a pumping source, an optical integration module, a gain optical fiber, a saturable absorber and a dual-wavelength pulse independent polarization mode linear coupling regulation and control structure, linear coupling strength of cross-polarization components in two wavelength pulses is independently regulated and controlled by using a structure of a polarization controller and a polarization maintaining optical fiber, and dual-wavelength mode-locked pulse laser of different types of pulse combinations can be obtained. The coherent pulse light source with unique spectral characteristics can provide a low-cost light source for the fields of high repetition frequency optical combs, all-fiber architecture high repetition frequency soliton sequences and microwave photonics.