820 results about "Continuous light" patented technology

The invention discloses a health monitoring bracelet detection method and system capable of detecting pulse rate blood oxygen in real time. The method comprises the steps that S1, continuous light absorption signal changes are obtained based on a photoplethysmography optical sensor; s2, a heartbeat pulse signal measurement pulse rate value is obtained according to change analysis; s3, wrist shaking is recognized based on data of the acceleration sensor, and pulse signal distortion caused by shaking is corrected; according to the health monitoring bracelet detection method and system capable of detecting the pulse rate blood oxygen in real time, the problem that when a user exercises, especially violent activities, due to the fact that an existing health monitoring bracelet is affected by wrist shaking in the exercise process, the user can feel uncomfortable in the exercise process is solved, and the health monitoring bracelet can be used for detecting the pulse rate blood oxygen in real time. The problems that light scattering and signal attenuation are caused, data collection and processing are affected, the measurement result of the pulse rate and the oxyhemoglobin saturation is not accurate enough due to external interference, and the reliability of the bracelet and the user experience are reduced are solved.

The invention relates to the technical field of distributed optical fiber sonic sensors, in particular to a monitoring and early warning method and system for a distributed optical fiber sonic sensor, and the method comprises the steps: obtaining historical sound wave data and early warning data in a preset time period from a database; forming a monitoring and early warning sample database; broadband chirp continuous light is used as detection light, single-frequency light is used as local oscillation light, a Rayleigh scattering light field of any frequency at any moment is reconstructed through coherent detection, and the response bandwidth of the distributed optical fiber sonic sensor is improved; constructing a monitoring model, using the trained monitoring model to analyze the sound wave signals collected by the distributed optical fiber sound wave sensor, and identifying normal sound wave signals and abnormal sound wave signals; a delay summation beam forming algorithm is introduced, and the accuracy of weak high-frequency sound wave signal detection of the distributed optical fiber sound wave sensor is improved; sound wave signals collected by the distributed optical fiber sound wave sensor are analyzed and processed through the early warning model, and a vibration event is recognized.

A system, apparatus and method directed to detecting damage to an optical fiber of a medical device. The optical fiber includes one or more core fibers each including a plurality of sensors configured to (i) reflect a light signal based on received incident light, and (ii) alter the reflected light signal for use in determining a physical state of the multi-core optical fiber. The system also includes a console having non-transitory computer-readable medium storing logic that, when executed, causes operations of providing a broadband incident light signal to the multi-core optical fiber, receiving reflected light signals, receiving reflected light signals of different spectral widths of the broadband incident light by one or more of the plurality of sensors, identifying at least one unexpected spectral width or a lack of an expected spectral width, and determining the damage has occurred to the optical fiber based on the identification.

The invention discloses a multi-sideband chirp modulation DAS system and a working method thereof, and relates to the technical field of distributed sound wave sensing. The DAS system comprises a narrow linewidth laser, an optical fiber coupler, a phase modulator, an electro-optical modulator, an erbium-doped optical fiber amplifier, an optical fiber circulator, a dense wavelength division multiplexer, a photoelectric balance detector, a data acquisition card, an arbitrary waveform generator, a direct current source and the like. The phase modulator is used for modulating constant-amplitude multi-frequency continuous light, the frequency number of light waves is related to the harmonic number of a microwave modulation signal, the frequency interval is determined by the fundamental frequency of the microwave modulation signal, the continuous light frequency can be flexibly modulated by adjusting the microwave modulation signal, and the modulation bandwidth is large; detected beat frequency signals are compressed into single-frequency signals through pulses, phase information of the single-frequency signals is demodulated, vibration signals along the sensing optical fiber can be detected, the spatial resolution of the system depends on the chirp frequency sweeping range, and the spatial resolution is high.

The present invention belongs to the field of optical fiber measurement technology, and specifically relates to an optical fiber distributed polarization crosstalk fast measurement device based on optical frequency domain interference. The device comprises a tunable laser source module (1), a device to be measured module (2), an auxiliary interferometer module (3) and a signal acquisition and analysis module (4), and is characterized in that: a high-coherence tunable laser is used to perform fast wavelength scanning on an optical signal, and a linear frequency modulated continuous light (501) is output, which passes through a polarizer (202), a device to be measured (206) and an analyzer (210) in sequence, and a beat frequency signal generated by the interference of a coupling light (704) and a transmission light (701) is obtained in the optical frequency domain, and then an optical path difference and a normalized interference signal amplitude are calculated, thereby respectively determining the polarization crosstalk position and intensity. The present invention, in combination with a tunable laser, gets rid of the dependence on an optical path scanning delay device in polarization crosstalk measurement, greatly improves the speed and dynamic range of polarization crosstalk measurement, and has a compact structure, is stable and reliable, and is easy to implement.

The invention relates to the technical field of electric wheelchair control, in particular to a multi-mode navigation control method and system of an electric wheelchair controller. The method comprises the following steps: acquiring a real-time environment monitoring video based on an electric wheelchair high-definition camera; video jitter distortion compensation and dynamic object frame-by-frame continuous optical flow tracking are carried out on the real-time environment monitoring video, and a moving track of each dynamic object is generated; performing environment static obstacle accurate identification on the real-time environment monitoring video, and performing dynamic environment perception modeling based on a moving track of each dynamic object so as to generate a dynamic environment map; a navigation mode switching decision is made based on a real-time wheelchair operation instruction of the user to obtain a current navigation mode of the user, and the current navigation mode of the user comprises a rocker control mode and an intelligent navigation mode. According to the invention, efficient and intelligent multi-mode control of the electric wheelchair is realized, so that the electric wheelchair can more flexibly and safely cope with a complex environment.

The invention relates to the technical field of angle-resolved photoelectron spectroscopy experimental instruments, and discloses an angle-resolved multi-electron coincidence measurement system and method based on an event-type delay line detector, and the system comprises an angle-resolved energy analyzer; a detection surface of the event type delay line detector is divided into at least two independent areas, and the event type delay line detector is used for receiving photoelectrons in parallel and independently outputting event signals; the external trigger and synchronization module is used for generating a unified trigger period to establish a global time reference; the time digital reading module is used for receiving the event signal and generating a timestamp; and the data acquisition and processing module is used for carrying out association judgment and selection based on the timestamps in the same triggering period. The dead time is reduced through multi-region parallel reading, unified time base calibration is achieved through time base line calibration and delay compensation, multi-electron coincidence measurement can be achieved under the condition that the angular resolution capability is kept, and the method is suitable for pulse or continuous light sources.

The invention discloses a continuous variable quantum key distribution method, device and system, and belongs to the field of wireless communication. Firstly, a sending end generates continuous light pulses for discrete coding, a one-dimensional discrete modulation signal is generated, quantum signal light is generated through an attenuator, and the quantum signal light is coupled to a quantum channel for transmission. Then, a receiving end adopts a homodyne detector to measure the regular component of the quantum signal in a self-calibration manner; and after a local measurement base direction and a phase drift angle introduced by a dynamic compensation quantum channel are adjusted in real time, a covariance matrix is calculated and input into a post-processing module, the code rate of the system is further calculated, and a security key is generated by using a protocol between a receiving end and a transmitting end. According to the device, the intensity modulator is connected between the laser and the attenuator, so that one-dimensional discrete modulation is realized, and dependence on a phase reference signal is avoided. According to the system, a traditional phase locking module is removed, an asymmetric phase space coding mechanism is adopted, dependence on a phase reference signal is eliminated, and the safety and stability of the system are improved.

A 2-micron large-energy solid two-way amplifier based on a single-frequency pulse optical fiber preceding stage can make full use of the small signal amplification capacity of optical fiber laser and the energy extraction capacity of solid laser, and meanwhile the problem that energy is difficult to improve due to the stimulated Brillouin scattering effect in an optical fiber is solved. And high-stability, high-repetition-frequency and large-energy single-frequency pulse laser output can be realized. The all-fiber cascade amplifier comprises an all-fiber cascade amplifier and a solid two-way amplifier, according to the all-fiber cascade amplifier, a continuous narrow-linewidth fiber laser is adopted as a seed source, continuous light is modulated into pulse light through an acousto-optic modulator, and the waveform, the pulse width and the repetition frequency of output pulse laser are adjusted; the modulated pulse light adopts a main oscillation power amplification structure and is preliminarily amplified by a polarization maintaining optical fiber amplifier; the solid-state amplifier adopts a two-way amplification structure, and further high-efficiency amplification is realized through solid-state two-way amplification. The whole laser system is compact in structure, stable, adjustable in parameter and capable of meeting application requirements of different scenes.

The invention discloses a single-ended BOTDA (Brillouin Optical Time Domain Analysis) multi-parameter simultaneous measurement method and a single-ended BOTDA multi-parameter simultaneous measurement device, and relates to the technical field of measurement. Wherein backward Rayleigh scattering light generated by continuous light in different modes in the few-mode optical fiber is used as detection light, sensing pulse light in different modes is used as pump light, and the detection light and the pump light in each mode generate intramode and intermode stimulated Brillouin scattering effect; then a photon lantern is used as a demultiplexer to extract detection light signals of each linear polarization mode, a photoelectric detector is used for detection, and finally temperature, strain and bending values are analyzed according to different characteristics of Brillouin frequency shift of each mode and corresponding coefficients of each physical quantity. According to the single-ended BOTDA multi-parameter simultaneous measurement method and device, the structure is simple, application is convenient, detection can still be carried out when optical fibers are broken, and multi-parameter simultaneous measurement with the high signal-to-noise ratio can be achieved.

Methods, systems, and devices for wireless communications are described. A network entity may generate a set of beamforming weights for a lens antenna associated with the network entity. Further, the network entity may generate the set of beamforming weights based on a convergence location corresponding to a target coverage area of a cell supported by the network entity. The convergence location may be based on the target coverage area and on one or more parameters of the lens antenna. As such, the network entity may transmit, via a set of antenna elements of the lens antenna, a signal to a user equipment (UE) in accordance with the set of beamforming weights for the lens antenna such that the signal may be spatially distributed within the target coverage area of the cell.

The invention discloses a laser multi-point focusing beam splitting auxiliary sintering method for a crystalline silicon battery piece. The method comprises the following steps: emitting a laser beam by adopting a continuous fiber laser; a light beam collimator is adopted to collimate and expand the laser beam; segmenting the collimated or low-emission laser beam into a plurality of laser beams in a lossless manner by using a lossless spectroscope; a plurality of laser beams sequentially pass through the high-speed scanning galvanometer and the field lens to form a multi-light-spot pattern, and the multi-light-spot pattern completes scanning processing on a fine grid on the front side of the crystalline silicon battery piece. The multi-spot pattern completes scanning processing on the fine grid on the front surface of the crystalline silicon cell piece, so that the laser processing scanning time on the front surface of the crystalline silicon cell piece can be shortened, and meanwhile, unbalanced carrier generation and collection are improved to reduce the contact resistance of a metal electrode. In addition, the whole surface of the cell does not need to be processed, the sintering time is shortened, and the laser-assisted sintering processing efficiency is improved.

The invention provides a BOTDR (Brillouin optical time domain reflectometry) system fusing Stokes-anti-Stokes light and a demodulation method, and belongs to the technical field of Brillouin distributed optical fiber sensing. The narrow linewidth laser is used for generating continuous optical signals; the input end of the coupler is connected with the laser, and the output end is connected with the pulse light branch and the local oscillator light branch. The pulsed light branch comprises a semiconductor optical amplifier, a random scrambler, a first erbium-doped optical fiber amplifier and a circulator which are connected in sequence; the local oscillator light branch comprises an electro-optical modulator, and the electro-optical modulator regulates and controls sideband frequency through a microwave module; the second erbium-doped optical fiber amplifier is used for extracting the Stokes light and the anti-Stokes light; the single-mode coupler mixes the double-sideband local oscillator light with the anti-Stokes light and the Stokes light; and the electrical beat frequency signals are acquired, filtered and enveloped and demodulated through an acquisition card. The detection capability of the Brillouin scattering signal is enhanced, the system structure is simplified, and the hardware cost and the maintenance difficulty are reduced.

The invention discloses a cross-domain attention modeling method and system based on multi-mode remote sensing data fusion, and relates to the technical field of remote sensing, and the method comprises the steps: obtaining night light intensity data and polarization reflection phase difference data of a target region, and according to a continuous light spot region exceeding a preset brightness threshold value in the night light intensity data, carrying out the polarization reflection phase difference data; generating an initial mask of the photovoltaic facility, performing phase feature verification on the initial mask based on the polarization reflection phase difference data, generating a precise positioning mask of the photovoltaic facility, extracting vegetation index time sequence data of a coverage area of the precise positioning mask, matching the vegetation index time sequence data with a preset photovoltaic interference waveform library, and identifying interfered pixels; the method has the beneficial effects that the interference of photovoltaic electric field construction on vegetation index data in desert boundary monitoring can be eliminated, so that the real migration rate of the vegetation-desert boundary can be more accurately determined, and reliable data support is provided for desert ecological environment change monitoring.

The invention discloses a method and device for optimizing metal powder laying additive manufacturing, the method comprises the steps that optical fiber beam combination is conducted on short pulse optical fiber laser and continuous optical fiber laser which are the same in wavelength to form a composite light source, and the pulse width of the short pulse optical fiber laser is the nanosecond level or the subnanosecond level; the composite light source is output to the galvanometer module through the beam combining optical fiber and then acts on the metal powder bed, and the low-cost and high-efficiency method of full coaxiality and concentricity of lasers of different light sources through the beam combining optical fiber is adopted, so that the printing stability, reliability and large-area uniformity are guaranteed; the short pulse laser and the continuous laser act on an irradiation metal area synchronously and coaxially all the time in the scanning process, metal powder bed melting manufacturing under the force oscillation effect is achieved, and the stability of a keyhole in the additive manufacturing process is improved. According to the method, the pore forming probability of laser powder laying sintering three-dimensional forming can be greatly reduced, the comprehensive mechanical property of a printed piece is improved, and wide popularization and application prospects are achieved.

The invention discloses a frequency modulated continuous wave laser radar phase noise compensation method. The frequency modulation continuous optical signal is divided into two paths: a measurement path and an auxiliary path; the frequency modulation continuous optical signal of the measurement path is divided into two paths, one path is used as a reference optical signal, the other path is used as a detection optical signal to be emitted to a target, and beat frequency is carried out on the received target reflection optical signal and the reference optical signal to obtain a beat frequency signal of the measurement path; the frequency modulation continuous optical signal of the auxiliary path passes through a Mach-Zehnder interferometer with a fixed time delay difference and then is subjected to beat frequency to obtain an auxiliary path beat frequency signal; searching and determining the frequency of the beat frequency signal of the measurement path, and extracting the phase noise in the beat frequency signal of the auxiliary path; estimating the phase noise of the measurement path; and finally compensating the phase noise. The invention also discloses a frequency modulated continuous wave laser radar phase noise compensation device. Compared with the prior art, the calculation amount of digital processing can be greatly reduced.

The invention discloses a puncture needle track prediction method, system and device and a medium. The method comprises the following steps: acquiring continuous photoacoustic imaging image data when a puncture needle punctures in tissue; processing the photoacoustic imaging image data, extracting a needle point position, and converting each frame of image data into a feature vector about the needle point position; a Transformer model is established, the input quantity of the model is the feature vector of past image data about the position of the needle tip and priori knowledge, and the output quantity of the model is the center coordinate of the needle tip of future image data and the insertion angle of the needle tip in the surrounding tissue. Through data enhancement and constraint injection, a pure data driven model can fuse physical laws and clinical experience, finally real-time and accurate prediction of the motion trail of the puncture needle is achieved, medical employees can be helped to more accurately control the path of the puncture needle in a complex operation environment, the misoperation risk is reduced, and the operation efficiency is improved. And the safety and the accuracy of medical puncture operation are obviously improved.

The invention relates to the field of optical fiber sensing detection, and discloses a forward transmission distributed optical fiber sensing detection method and system based on chirp modulation, a terminal and a storage medium, and the method comprises the steps: obtaining a sensing detection task of a sensing optical fiber, obtaining a single-frequency continuous optical signal and a radio frequency signal according to the sensing detection task, performing chirp modulation on the single-frequency continuous optical signal according to the radio frequency signal to obtain a plurality of modulated optical signals; superposing all the modulated light signals to obtain a sweep-frequency light field, and dividing the sweep-frequency light field to obtain a sensing light field and a reference light field; performing interference processing on a target sensing light field output by the sensing optical fiber and the reference light field to obtain beat frequency interference light intensity, and performing filtering to obtain a target beat frequency interference signal; and performing demodulation processing on the target beat frequency interference signal to obtain a light field phase change, and performing vibration positioning on the sensing optical fiber to obtain an optical fiber vibration position so as to obtain a sensing detection result. According to the invention, not only is the detection cost reduced, but also the vibration on the sensing optical fiber can be accurately positioned.

The embodiment of the invention relates to the field of photomasks, and provides a photomask protective film frame and a preparation method thereof, the photomask protective film frame comprises a frame main body made of a metal material and a coating formed on the surface of the frame main body, and the photomask protective film frame is characterized in that the coating is at least composed of carbon black, silicon dioxide particles and organic dye. The nanoscale carbon black in the coating has a high light absorption coefficient, fills gaps of dye molecules and forms a continuous light absorption network, the organic dye enhances absorption of light with specific wavelength through a molecular structure conjugated system, and the nanoscale carbon black and the organic dye form a composite function of broad-spectrum absorption and accurate waveband adjustment, so that more than 95% of light is absorbed in a broad-waveband range, light reflection on the surface of the frame is reduced, and the light absorption efficiency is improved. Pattern distortion caused by reflected light in the photoetching process is avoided, silicon dioxide is embedded into an organic dye matrix, silicon dioxide gaps are filled with carbon black particles, the porosity of the coating is reduced, the wear resistance of the coating is improved, and the cracking risk of the coating is reduced. Optical absorption, wear resistance and weather resistance are synchronously improved.

The invention provides a biological method for synergistically immobilizing methane and carbon dioxide, which comprises the following steps: mixing activated sludge with microalgae, continuously introducing gas, and forming an algal-bacterial symbiont under the condition of continuous illumination; the method comprises the following steps: putting the algal-bacterial symbiont into a reactor, pumping sewage, introducing gas, and carrying out periodic operation according to a water feeding-aeration-precipitation-drainage mode; wherein the gas comprises methane and carbon dioxide, and the sewage comprises a carbon source, a nitrogen source and a phosphorus source. According to the method, the bacteria-algae particles can be obtained through culture, and the bacteria-algae particles can provide electrons for denitrification by using the soluble methane as an electron donor, so that the purposes of synchronously removing the soluble methane and denitrifying are achieved, and the denitrification process is optimized. The bacteria-algae particles can also realize fixation of methane and carbon dioxide, the sewage treatment process is optimized, and the problems that soluble methane is difficult to remove and carbon emission is high in the existing sewage treatment process are solved.

The invention discloses a method for representing the detection efficiency of a sine-gated single-photon detector by using continuous light. The method comprises the following steps: collecting count values of the single-photon detector under different bias voltages; calculating an initial gate width, an initial average photon number and initial detection efficiency according to the initial over-bias voltage; increasing the bias voltage by a step value, calculating widths of different parts of gate pulse detection efficiency under the voltage, and calculating count values of the different parts; subtracting the count value measured under the bias voltage from the sum of the count values of all the parts to obtain a corrected count value, and calculating the detection efficiency; whether the bias voltage reaches a set maximum value or not is judged, if not, the bias voltage continues to be increased, and meanwhile the detection efficiency is corrected; and if the maximum value is reached, the detection efficiency obtained through processing is used as a final calibration value. The method can correct the detection efficiency when a continuous light source is used, and eliminates the influence of a plurality of voltage intervals, so as to calibrate the maximum detection efficiency of the detector.

The utility model relates to the technical field of optical fiber communication, and discloses a polarization equalization transmitting assembly based on a coherent light silicon optical chip, which adopts a second optical splitter with an adjustable splitting ratio to split input continuous light and equalizes output light power of two paths of coherent light of X polarized light and Y polarized light. The two paths of coherent light of X polarized light and Y polarized light can be pre-adjusted only by adjusting the splitting ratio of the second optical splitter, optical power balance is achieved, high-speed electro-optical modulators in the two paths of coherent light do not need to be adjusted, the high-speed electro-optical modulators can be kept in the optimal state, an adjustable optical attenuator does not need to be additionally arranged in the two paths of coherent light, and the optical power balance is achieved. The utility model has the effects of improving the output power of the transmitting assembly, reducing the self power consumption of the transmitting assembly and improving the utilization efficiency of the high-speed photoelectric driver, and is more suitable for a small-sized packaged coherent optical module based on a coherent optical silicon optical chip.

The invention discloses a periodic forked near-transformation limit nanosecond pulse mode-locked fiber laser and a generation method. The laser is characterized in that a fiber ring cavity comprises a wavelength division multiplexer, an erbium-doped fiber, a first polarization controller, a polarization analyzer, a dispersion control unit, an output coupler, a fiber isolator and a second polarization controller which are sequentially connected in a closed loop mode. The method comprises the steps that pumping continuous light is coupled into the laser through the wavelength division multiplexer; pumping continuous light is absorbed by using an erbium-doped fiber and is stimulated to radiate a gain pulse with a long wave band, and the generated pulse oscillates in a fiber laser cavity; under the combined action of a first polarization controller, an analyzer and a second polarization controller, an equivalent saturated absorption effect is generated by utilizing nonlinear polarization rotation generated when gain pulses are propagated in an optical fiber, and pulse mode locking is realized; the optical fiber laser works in an abnormal dispersion region, so that generated pulses meet the soliton area theorem, and near-transformation limit pulses are generated. According to the invention, nanosecond pulse period bifurcation output of the short-cavity fiber laser can be realized.

The invention belongs to the technical field of optical measurement, and relates to a planar dispersion lens, a spectrum confocal measurement system and a morphology measurement method. The planar dispersion lens comprises a substrate and a planar lens group. The planar lens group comprises N layers of planar super-oscillation cylindrical lenses which are stacked in the direction from the position close to the substrate to the position away from the substrate. When the broadband continuous light source vertically enters from the surface of one side, far away from the plane lens group, of the substrate, the N layers of plane super-oscillation cylindrical lenses are used for dispersing light in different wave band ranges in the broadband continuous light source respectively, and a plurality of super-resolution light sheets which are dispersed in the axial direction are generated; wherein N is greater than or equal to 2. When a light sheet generated by the planar dispersion lens designed in the scheme serves as a super-resolution sheet light source to perform spectrum confocal measurement on a sample, the inherent contradiction between an optical field of view and resolution can be effectively broken through, and the spectrum confocal measurement precision can be effectively improved by applying the light sheet to a spectrum confocal measurement system.

The invention provides a laser holographic anti-counterfeiting film makeup method for optimizing seam precision, which comprises the following steps: acquiring light wave phase distribution data of a seam area through a preset optical simulation model, and calculating light wave phase difference of adjacent holographic image edges by adopting a fast Fourier transform algorithm to obtain spatial distribution coordinates of phase discontinuous points; extracting optical characteristic parameters of a seam area from the optimized phase distribution data, and simulating a propagation path of light waves in the seam area by adopting a finite element analysis method to obtain boundary conditions of smooth transition of the light waves; and manufacturing parameters of a seam area are extracted from the final microstructure template data, a holographic pattern of the seam area is generated through light wave phase modulation and pixel dot matrix density control by adopting a laser direct writing technology, and the holographic anti-counterfeiting film makeup with optical fracture suppression is obtained. By accurately controlling phase distribution and bright spot design of the seam area, continuous transition of light waves and visual seamless connection are achieved.

The invention provides a turbidity meter high-precision detection method based on light scattering and absorption spectrum fusion, relates to the technical field of turbidity meter detection, and aims to solve the problems that complex pretreatment operation is needed, time is consumed, and a large number of chemical reagents are consumed in a traditional method. The method comprises the following steps: S1, firstly, carrying out light scattering detection: measuring light scattering intensity by a turbidity detector and detecting the turbidity of a water sample to be detected according to the intensity; s2, absorption spectrum detection: measuring the absorption spectrum intensity of the water sample to be detected by a turbidity detector, and detecting the turbidity of the water sample to be detected according to the intensity; respectively measuring the absorbance of the water sample to be detected and the measured value when the water sample to be detected does not exist by adopting a continuous light source and a white board; detecting the turbidity of the water sample to be detected according to the detection absorption spectrum intensity; the absorbance of the detected water sample is a measured value when the detected water sample exists, and the absorbance of the white board is a measured value when the detected water sample does not exist. The system can well adapt to severe environments of water environment monitoring and drinking water detection, can effectively guarantee the reliability of water quality monitoring, and is beneficial to water quality improvement.

The invention belongs to the technical field of optical communication safety, and aims to solve the problem that the robustness of chaotic laser in a turbulent environment is poor and the chaotic laser is seriously limited in long-distance free space optical communication. The invention provides an anti-turbulence chaotic Bessel Gaussian beam generation device and method, and the method comprises the following steps: laser is collimated through a first plano-convex lens, passes through an adjustable continuous light attenuation mirror and a dielectric film reflector, then returns to the interior of a laser, and generates a chaotic Gaussian beam based on the disturbance of a light field; a chaotic Gaussian beam is emitted from a first non-polarization beam splitter, and the polarization state of the beam is adjusted through a half-wave plate and a linear polarizer, so that the working direction of the beam is the same as that of a reflective pure-phase spatial light modulator; and the beam is expanded by the second plano-convex lens and the third plano-convex lens and is transmitted to the reflective pure-phase spatial light modulator to obtain an l-order chaotic Bessel-Gaussian beam. According to the invention, the chaotic laser and the Bessel beam are combined to cope with a complex space optical communication environment.

The invention relates to the technical field of film laminating systems, in particular to a laminating system and method for an OCA flexible film, the system is used for laminating the OCA flexible film on a laminated product, the system comprises a dust-free cabin, a film tearing module, a material suction module, a positioning module and a laminating module, the system further comprises a control module in signal connection with the visual positioning unit. A plurality of fitting subunits form a fitting surface, the lower end surfaces of all the subunits are dynamically spliced into a continuous curved surface during movement, a swing phase is adjusted to form a wavy progressive path, and more specifically, starting from a fitting center, each subunit is sequentially lifted and pressed to form an action sequence similar to continuous slight touch of a fingertip; in the process, the laminating pressure is transmitted in a stepped mode in the radius direction, the risk that a traditional steel wheel scrapes the diaphragm is avoided through segmented flexible contact, and the problem that edge bubbles are likely to be generated when a laminating system in the prior art is used for laminating the OCA flexible diaphragm is solved.

The invention discloses an electronic brake system of a fishing reel, and belongs to the technical field of fishing gears. The system comprises a side cover, an adjusting drive plate, a brake adjusting execution assembly, a supporting cover plate, a coil base, an electric control board and a wire cup assembly, wherein the electric control board integrates an optical detection module, a conductive detection module and a control unit; a stop block of the brake adjusting execution assembly and an adjusting drive plate move synchronously, a conducting circuit and a conducting contact can be selectively conducted through a conducting layer on the bottom face of the brake adjusting execution assembly, discrete electric signals identifying gears are output, meanwhile, the shielding degree of the stop block on an optical path of the optical detection module changes continuously, and continuous light sensation analog signals are formed. And the control unit locks the gear according to the discrete electric signal, and responds to the light sensation analog signal to realize stepless regulation of the braking force in the same gear. The device adopts dual-mode cooperative detection, has the characteristics of no mechanical wear, high precision and strong interference resistance, is compact in structure and controllable in cost, effectively improves the casting stability of the fishing reel and the user experience, and is suitable for various fishing reels with precise brake requirements.

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.