543 results about "Acousto-optics" patented technology

The invention belongs to the technical field of stator slot wedge detection, and discloses a generator stator slot wedge online detection method and system based on acousto-optic monitoring fusion. The method comprises the following steps: acquiring laser ranging data, acoustic monitoring data and generator working condition parameter data of online looseness detection of a generator stator slot wedge; preprocessing the laser ranging data, the acoustic monitoring data and the generator working condition parameter data to obtain laser ranging features, acoustic features and working condition parameters; and inputting the optical ranging features, the acoustic features and the working condition parameters into a pre-trained auto-encoder for anomaly detection, and obtaining an online looseness detection result of the generator stator slot wedge. By fusing the optical ranging technology, the optical fiber acoustic monitoring technology and the unsupervised deep learning algorithm, the important technical breakthrough in the field of generator stator slot wedge looseness detection is realized, and online stator slot wedge looseness detection can be carried out.

Disclosed herein is an optical frequency comb generator for a distributed acoustic anomaly detection system. The system can include a continuous wave frequency modulated laser source configured to generate a laser signal. The system can include an acousto-optical modulator configured to modulate the laser signal by altering an amplitude and / or frequency of the laser signal based on an RF drive signal applied to the AOM, and to output an optical pulse with multiple frequency sidebands based on the modulation. The output can form an optical frequency comb usable detecting and locating acoustic anomalies within a structure under observation.

The invention relates to an acousto-optic coupled intelligent sleep aiding method and system. The method comprises the following steps: constructing an initial sound scene environment and controlling sound and light output to smoothly transit to a reference value; collecting a user respiration signal to obtain a respiration rhythm; adjusting the sound and light output rhythm to be synchronous with the respiratory rhythm; coupling the acousto-optic output with the respiratory rhythm on the basis of keeping synchronization; executing acousto-optic guidance according to the selected sleep aiding mode and the acousto-optic coupling mode, and guiding the respiratory rhythm to a target frequency by adjusting an acousto-optic output change frequency; and when the user is in the sleep state, controlling the sound-light output to smoothly transit to a closed state. By adopting the method, dynamic synchronization and self-adaptive guidance of acousto-optic output and the breathing rhythm of the user can be realized, the problem of rhythm mismatch caused by fixed output rhythm of traditional sleep-aiding equipment is effectively solved, and the sleep-aiding effect is improved.

The invention belongs to the technical field of laser, and discloses a laser beam splitting and combining device based on an acousto-optic deflector pair and application thereof, and the laser beam splitting and combining device comprises a transmitting optical fiber module, a first acousto-optic deflector, a diaphragm, a second acousto-optic deflector and a receiving optical fiber module which are sequentially arranged; the first acousto-optic deflector and the second acousto-optic deflector are arranged in parallel; the transmitting optical fiber module is used for transmitting laser to the first acousto-optic deflector; the first acousto-optic deflector and the second acousto-optic deflector are used for deflecting, splitting or combining laser beams; the diaphragm is used for blocking secondary diffracted light except the primary diffracted light; and the receiving optical fiber module is used for receiving the laser emitted from the second acousto-optic deflector. Therefore, the technical problems that in the prior art, the laser beam splitting function and the laser beam combining function are mutually independent, two kinds of operation cannot be considered in the same device, and real-time regulation and control over the light beam operation mode are lacked are solved.

The invention discloses an acoustic optical communication positioning method for an autonomous adjustment channel of an underwater robot, and the method comprises the steps: constructing an underwater dynamic acousto-optic fusion repeater, achieving the wide-area guaranteed-bottom connection with the underwater robot through an acoustic link, and providing meter-scale precision coarse positioning covering a whole operation region; the method provides prior information for rapid establishment of a subsequent optical link, further dynamically compresses an optical search area to realize rapid and accurate link establishment, and performs autonomous and smooth switching among acoustic, optical and acousto-optic hybrid transmission modes according to real-time link quality assessment (signal-to-noise ratio), thereby realizing acousto-optic deep coupling and cooperative scheduling, and improving the reliability of the system. The system has the advantages of long-distance reliable connection, short-distance high-speed data return, high-precision positioning and the like, and solves the core technical problems that the distance and the speed cannot be obtained at the same time and the positioning precision and the coverage range are mutually restricted in the prior art.

The invention relates to the technical field of underwater target detection, in particular to an underwater image target detection method and system based on multi-modal fusion. The method comprises the following steps: acquiring an underwater optical image and sonar image pair and a trained underwater multi-mode target detection network; inputting an image pair into the network, and respectively extracting multi-scale features of an optical mode and a sonar mode through a double-branch backbone network; a cross-modal feature offset is calculated by using an attention mechanism and a confidence mask through a multi-modal feature alignment module, and spatial adaptive alignment of acousto-optic features is realized; a multi-head zoom dot product attention and parallel double-gating structure is adopted through a cross-modal feature fusion module, bimodal complementary features are adaptively screened and fused, and target feature representation is enhanced; and the fused features are sent to the detected neck and head to complete target classification and positioning. According to the method, the problems of underwater acousto-optic mode space dislocation and imaging difference are solved, and the precision and robustness of target detection in a complex underwater environment are improved.

The invention relates to an intelligent temperature control rock heat-water-force-sound-light multi-field coupling disturbance shearing device and a use method of the intelligent temperature control rock heat-water-force-sound-light multi-field coupling disturbance shearing device. A disturbance shearing mechanism composed of a trapezoid pressing rod, a constant damper and a spring is additionally arranged on the driving side of the lower shearing box. When the tangential loading shaft is propelled at a constant speed, the mechanism can convert stable linear displacement into disturbance shear load of periodic loading and unloading, so that engineering power disturbance is simulated. According to the device and the method, periodic shear disturbance is synchronously applied to a rock sample in a high-temperature seepage environment, mechanical response, seepage characteristic change, internal micro-fracture and surface full-field deformation of the rock sample are comprehensively observed, and an advanced test means is provided for researching a catastrophe mechanism of a deep rock mass under the action of multi-field coupling and dynamic disturbance.

The invention relates to the field of welding seam detection, and discloses a welding seam center line real-time tracking method and device, computer equipment and a storage medium, and the method comprises the steps: obtaining a laser tracking evaluation speed, an ultrasonic tracking evaluation speed and a tracking speed threshold value of a to-be-detected weldment; if the laser tracking evaluation speed and the ultrasonic tracking evaluation speed are both larger than the tracking speed threshold value, the weld joint center line of the to-be-detected weldment is tracked according to a laser and ultrasonic simultaneous inspection strategy; and if the laser tracking evaluation speed or the ultrasonic tracking evaluation speed is smaller than or equal to the tracking speed threshold value, the welding seam center line of the to-be-detected weldment is tracked according to a main laser and auxiliary ultrasonic strategy. According to the invention, the obvious limitation of a single laser tracking technology under the conditions of a complex surface and strong illumination is overcome, and high-precision and high-robustness real-time tracking is realized through acousto-optic fusion.

The invention relates to the technical field of intelligent lighting and voice interaction, in particular to a lamplight rhythm control system and method based on voice interaction, and the method comprises the steps: carrying out the analysis and feature extraction of a collected voice signal, and constructing a dynamic model which depicts the vortex core strength and position evolution of a sound field; an acoustic vortex sequence extracted based on the model is converted into an acoustic pattern sequence with space ductility through a pre-trained generative adversarial network. And carrying out space-time folding transformation on the pattern sequence to generate a high-dimensional acoustic instruction code so as to drive a lamplight array to present complex space rhythms associated with the dynamic depth of the voice. According to the method, the limitation of direct mapping of traditional audio visualization is broken through, intelligent generation and nonlinear mapping from a voice dynamic structure to light space art are realized, and the expressive force and immersion of acousto-optic interaction are improved.

The invention relates to a leak rate detection device and method based on a laser emission resonant cavity. The leak rate detection device comprises a resonant cavity; a laser transmitter; the conversion device is used for converting the photoacoustic signal into an electric signal; and the processing device converts the electrical signal into a leak rate Q. The leakage rate detection method comprises the following steps: setting an acousto-optic resonant frequency f of the resonant cavity; the wavelength of the laser emitted by the laser emitter is modulated, and the modulation frequency is the same as the acousto-optic resonance frequency f; controlling a laser transmitter to transmit modulated laser to an incidence window, and enabling the laser to irradiate the interior of the resonant cavity after passing through the incidence window; the characteristic gas absorbs the laser to generate vibration, and a photoacoustic signal is generated; collecting a photoacoustic signal by using a conversion device, and converting the photoacoustic signal into an electric signal; modulating the electric signal to obtain the oxygen concentration in the resonant cavity; and obtaining the leakage rate Q of the semiconductor cavity according to the oxygen concentration. According to the invention, the leakage condition of the semiconductor chamber can be accurately detected without shutdown.

The invention provides a laser frequency stabilization device and method based on optical frequency shift, and relates to the field of laser frequency stabilization, and the device comprises a first slave laser, a first frequency stabilization system, a second slave laser, a second frequency stabilization system, a master laser, an acousto-optic modulation module, and a phase-locked frequency stabilization device. The first slave laser is used for emitting first laser of a first wavelength; the main laser is used for emitting third laser with a second wavelength; the first frequency stabilization system is used for locking the first laser according to the first laser to obtain first frequency-stabilized laser; the second slave laser is used for emitting second laser with the first wavelength; the second frequency stabilization system is used for locking the second laser to obtain second frequency-stabilized laser; the acousto-optic modulation module is arranged between the first slave laser and a light path of the phase-locked frequency stabilization equipment; and the phase-locking frequency stabilization equipment is used for receiving the first frequency stabilized laser and the second frequency stabilized laser and carrying out frequency locking on the third laser according to the first frequency stabilized laser and the second frequency stabilized laser. According to the invention, the modulation transfer spectrum and the optical frequency shift can be combined to complete frequency locking of the laser.

The invention discloses a fatigue monitoring method and system for an electric power scene, and the method comprises the steps: collecting an electroencephalogram signal of an electric power worker, and obtaining original electroencephalogram signal data; preprocessing the original electroencephalogram signal data to obtain a purified electroencephalogram signal; calculating a power spectrum density and a frequency band energy ratio based on the purified electroencephalogram signal; based on the power spectrum density and the frequency band energy ratio, generating a preliminary fatigue index and a fatigue probability, and performing weighted fusion on the preliminary fatigue index and the fatigue probability to obtain a fatigue level; and when the fatigue level is greater than a preset value, triggering acousto-optic early warning. Therefore, the calculation complexity during state updating is reduced, the time consumption of single filtering is reduced to be within an equipment sampling interval, the real-time response capability of fatigue monitoring is ensured, and the timeliness requirement of an electric power scene on online monitoring is met.

The invention provides an avalanche real-time monitoring and early-warning system, and the system comprises avalanche monitoring stations which are installed at multiple points in the avalanche advancing direction, and each avalanche monitoring station is composed of a vibration sensor, a remote wireless alarm signal transmitter, a solar power supply system, and a monitoring rod. The acousto-optic alarm station is arranged on a road, a mining area, a pasturing area, a tourist area and a personnel residential area and is composed of a remote wireless alarm signal receiver, a signal processor, a flashing light, a high-power loudspeaker, a solar power supply system and a monitoring rod. The environment monitoring station is composed of an infrasound sensor, an earth sound sensor, a rainfall and snowfall sensor, a temperature and humidity sensor, a wind direction and wind speed sensor, a solar power supply system, an LORA radio transceiver and a monitoring rod. And the intelligent telemetering control terminal consists of an intelligent telemetering terminal, a solar power supply system and a monitoring rod. The system is helpful for timely sending dangerous case alarms to the masses in a threat area before and just when an avalanche disaster occurs, so as to avoid or reduce casualties and property loss.

The invention relates to the technical field of nondestructive testing of constructional engineering, and discloses a laser measuring instrument for nondestructive testing of concrete cavities, which comprises a laser interference measuring assembly, a paraxial sound wave excitation assembly, coaxially arranged anti-interference equipment and a cooperative control processing system. The sound wave excitation assembly performs wide-area excitation on the concrete surface, and the laser interference measurement assembly receives returned light through a clean light path constructed by the anti-interference equipment. The cooperative control processing system establishes acousto-optic time-frequency association by using an adaptive control module, generates a phase compensation angle according to ranging data to eliminate phase lock loss caused by sound wave propagation delay, and monitors a spectral gradient to automatically trigger fixed-frequency locking to capture resonance response. And the signal analysis module uses the phase compensation correction signal, and outputs cavity features through dual data cleaning and thermodynamic diagram analysis. According to the invention, the problems of time-space synchronization and weak signal extraction of long-distance non-contact detection in a complex environment are effectively solved.

The invention discloses a GIS image voiceprint joint sensing method and system based on multi-modal interaction and edge intelligent optimization, and belongs to the technical field of intelligent sensing and data processing of power equipment. The method provided by the invention comprises the following steps: acquiring feature vectors for images and voiceprint signals generated in the operation process of GIS (Geographic Information System) equipment; performing cross-modal semantic coding and fusion expression on the feature vector to obtain a unified cross-modal semantic feature vector, and predicting bandwidth dynamic allocation based on a multi-modal code stream demand according to the cross-modal semantic feature vector; and carrying out computing power arrangement optimization on the predicted bandwidth dynamic allocation based on data storage backlog perception, and after the computing power arrangement optimization is completed, judging the cross-modal semantic feature vector so as to perceive the image and the voiceprint signal. According to the invention, synchronous acquisition and joint determination of the acousto-optic signals of the GIS equipment are realized.

The invention provides a 40Hz acousto-optic stimulation dynamic optimization system based on electroencephalogram closed loop feedback, belongs to the technical field of cognitive disorder treatment, and solves the technical problems that an existing stimulation system lacks a dynamic closed loop, ignores individual differences, lacks a cross-band coupling mechanism and the like. Comprising an electroencephalogram gamma oscillation power detection module, an embedded signal processing and analysis module, a stimulation parameter generation and execution adjustment module, a personalized strategy database module, a multiple safety protection module, an edge calculation and communication module, a user interaction module, a head-mounted acquisition and stimulation device, a scene adaptation engine module and a double-loop closed-loop feedback control module. And the processing algorithm module comprises user terminal equipment with application software and a cloud central processing unit. According to real-time electroencephalogram feedback, a personalized historical data strategy library and an algorithm, parameters of 40Hz acousto-optic stimulation can be dynamically adjusted by relying on a double-loop closed-loop feedback control mechanism, and a mature cloud-edge-end cooperative computing ecosystem is constructed.

In the field of ultrastable laser technology, tuning an ultrastable laser maintains its performance indicators without increasing additional lock noise and out-of-loop drift. [Solution] One acoustic-optic modulator and one electro-optic modulator are introduced separately, and the laser device, frequency shift unit, PDH frequency stabilization control unit, and ultra-stable cavity are integrated. [Effects] By changing the frequency of the acousto-optic modulator, high-precision tuning of the ultra-stable laser can be achieved. By changing the frequency of the electro-optic modulator, wide-range tuning of the ultra-stable laser can be achieved, enabling wide-range, high-precision, and dead-zone-free frequency tuning.

This invention discloses a design method for a deep-sea in-situ fine-scale detection framework based on acoustic-optical remote sensing and VR technology. The main steps include: (1) studying the structure of the photon-counting lidar scanning system and the dynamic geometric relationship between the mother ship and the submersible, and constructing a calculation model for the lidar bathymetry point coordinates in the WGS84 spatial rectangular coordinate system; (2) considering the submersible's attitude, and based on the ray-tracking model and the geometric relationship between the mother ship and the submersible, constructing a calculation model for the multibeam bathymetry point coordinates in the WGS84 spatial rectangular coordinate system; (3) fusing the lidar and multibeam bathymetry points to construct a seabed topographic map; (4) proposing a development scheme and detection method for a deep-sea functional imaging spectrometer; and (5) constructing a VR environment for the deep-sea target survey area using a three-dimensional seabed topography model, rendering technology, and binocular stereo imaging technology. Through these steps, deep-sea in-situ fine-scale detection based on acoustic-optical remote sensing technology and the construction of a VR environment for the survey area can be achieved.

The utility model relates to warning device technical field, and disclose a kind of strong light frequency flash sound light type electronic warning device, including base, fixed column, sleeve, fixed box and the like component, by the transmission mechanism of stepper motor, bevel gear, screw rod, sleeve is realized along fixed column sliding up and down, the height of frequency flash lamp and alarm loudspeaker can be flexibly adjusted, utilize second stepper motor, worm gear drive installation rod rotation, accurately adjust the horizontal angle of frequency flash lamp and alarm loudspeaker, compared with traditional warning device, the device overcomes the defect that height and angle are fixed, warning range is limited, in road construction, fire rescue and the like complex scene, can cross over barrier to transfer warning signal, target area is covered simultaneously in all directions, while the application of double stepper motor improves power transmission efficiency and control accuracy, ensure that device responds quickly in emergency, significantly improve the timeliness, accuracy and reliability of warning, effectively reduce the risk of safety accident.

The utility model relates to the technical field of warning lamps, and discloses an LED warning lamp with an acousto-optic synchronous warning function, which comprises an outer sleeve, an LED circuit board is mounted at the upper end of the outer sleeve in a sleeving manner, a propagation hole is formed outside the outer sleeve, a bottom plate is mounted at the lower end of the outer sleeve in a matched manner, and a vertical column is fixedly connected to the middle of the bottom plate. The stand column is sleeved with a rotating seat, and the middle of the rotating seat is fixedly connected with a sound wave conduction sleeve. According to the LED warning lamp with the acousto-optic synchronous warning function, a motor is started, the motor drives a rotating seat to rotate, the rotating seat drives a sound wave conduction sleeve to rotate on the inner side of an outer sleeve, namely, after a scraper blade gives an alarm, the alarm can be conducted in different directions, and the warning effect of a sound wave warning device is improved; the sound wave conduction sleeve drives the scraping plate to scrape the inner side of the outer sleeve, and then the cleanliness of the interior of the outer sleeve is improved in the process that the scraping plate is driven to give an alarm.

The application discloses a self-luminous replaceable plate type photocatalytic experimental device and method with sound-light coupling reinforcement, relates to the technical field of photocatalysis, and comprises a self-luminous catalytic substrate, a reaction tank integrated with an ultrasonic transducer, an online monitoring unit and an external pumping circulation system; the self-luminous catalytic substrate is made of a semi-transparent optical fiber material and has an optical fiber guiding structure inside, can concentrate and guide external light to the inside of the substrate and uniformly transmit the light out of the surface, and serves as not only a support carrier of a catalyst but also an efficient in-situ surface light source; the ultrasonic cavitation reinforces the liquid-solid interface mass transfer and peels off a toxic layer in real time; the online monitoring unit acquires reaction efficiency data in real time and accurately guides physical replacement of the substrate according to a kinetic decay curve; the application realizes full-process zero-loss transmission of light energy and orders-of-magnitude improvement of mass transfer efficiency, solves the problem of low photocatalytic efficiency caused by limited light transmission and mass transfer bottleneck, and is suitable for evaluation of high-performance catalytic materials and research on deep treatment of high-viscosity / high-turbidity systems.

The invention discloses a multi-mode light-supplementing sleep-aiding control circuit, device and system integrating sound, light and smell, and a control method, and relates to the technical field of electronic circuits. The circuit comprises a main control module, a light supplementing module, a sleep-aiding lamplight module, an environment sensing module, an aromatherapy module, a power amplifier loudspeaker module and the like, low-blue-light soft and brightness-adjustable illumination is output through the light supplementing module, and the problems of too strong blue light, screen stroboflash and reading fatigue when an intelligent terminal is used are solved. The sleep-aiding light module can be adjusted to warm color temperature, the mood is relaxed, and illumination secreted by melatonin is not damaged. The environment sensing module collects environment light and proximity distance information in real time, so that the equipment can intelligently adjust the light supplementing brightness and the sleep-aiding lamp mode; hot fumigation closed-loop control is adopted for the aromatherapy module, constant-temperature adjustment is achieved through temperature sampling, and volatilization of sleep-aiding fragrance is more stable and safer; the power amplifier loudspeaker module provides stable output for white noise, natural sound and rhythmic respiration guiding sound, and provides reliable acoustic assistance for sleep adjustment.

The application discloses a vortex light interference device and method for measuring three-dimensional vibration and sound field rotation characteristics, wherein a helium-neon laser emits laser light, the laser light passes through a half-wave plate and a first polarization beam splitter prism, and is divided into object light and reference light; the object light passes through a first spiral phase plate and becomes vortex object light, the vortex object light passes through a second polarization beam splitter prism, a quarter-wave plate, and a beam expander lens, and is irradiated on a test sample surface, reflected light of the sample surface passes through the beam expander lens, the quarter-wave plate, the second polarization beam splitter prism, a beam splitter prism and a focusing lens, and is irradiated on a photodetector; the reference light passes through an acousto-optic modulator to generate frequency modulation, passes through a mirror and a second spiral phase plate to become frequency-modulated vortex light, and the vortex light passes through a beam splitter prism and a focusing lens and is irradiated on the photodetector; a computer calculates and demodulates frequency-modulated signals of the photodetector and modulation signals of the acousto-optic modulator, and finally obtains three-dimensional vibration information and sound field rotation characteristics of the sample.

The invention provides an acousto-optic fusion detection method and system for an underwater vehicle, and the method comprises the steps: obtaining the initial detection information of a suspicious target in an underwater region, and dynamically selecting a sensing strategy according to the initial detection information; and performing cooperative processing on data from different detection loads based on the sensing strategy, and continuously updating the detection information of the suspicious target through a processing result. The underwater camera, the laser camera and the foresight sonar are integrated on the bow section of the aircraft, a multi-source load cooperative detection framework is constructed, the system firstly utilizes the wide area coverage capability of the foresight sonar to carry out comprehensive scanning measurement on an underwater area, the initial position information of a suspicious target is quickly locked, and a sensing strategy is dynamically adjusted according to the target distance. According to the method, the contradiction between the limited distance of optical equipment and insufficient resolution of sonar equipment in traditional underwater detection is effectively solved, and the target recognition precision and the system robustness in a complex water area environment are remarkably improved.

The invention discloses a device and a method for testing frequency domain characteristics of a high-speed optoelectronic device. The device comprises a laser, a sawtooth wave generator, a signal source, an acousto-optic modulator, an electro-optic intensity modulator, a low-frequency photoelectric detector, a frequency spectrograph and a computer. An electro-optic intensity modulator is driven through a sawtooth wave modulation technology, and frequency-shifted and non-frequency-shifted optical carriers and frequency-shifted and non-frequency-shifted radio frequency optical sidebands are synchronously generated in an optical path in combination with radio frequency signal modulation. And after the signal is subjected to beat frequency processing by the photoelectric detector, the power of the frequency shift signal in different working states is measured by the frequency spectrograph, so that the frequency domain characteristic parameters of the photoelectric device to be measured are obtained. The method is based on sawtooth wave modulation and an amplitude comparison method, frequency domain response characteristics of a single / dual-drive electro-optic intensity modulator, dual-parallel electro-optic intensity modulation and a photoelectric detector can be accurately represented, the test method is simple, and dependence on a high-frequency test instrument is effectively reduced.

The invention discloses a tomography and targeted energy thermal therapy system and method based on an acousto-optic coupling functional film layer, and relates to the technical field of noninvasive medical diagnosis and treatment. The system comprises an intelligent processing carrier, an acousto-optic coupling function film layer, a scanning mechanism, an energy treatment module and a processing and temperature control module. The intelligent processing carrier at least comprises a 20Hz-20kHz audio unit, a pickup unit, an optical signal unit and a processor; the acousto-optic coupling functional film layer is of a single physical structure and is inseparable, acoustic frequency conversion focusing imaging and targeted warm delivery at 42-47 DEG C are achieved in the same physical area in a time-sharing mode, the acoustic processing layer achieves 1000-8000 frequency doubling through a multi-stage resonance microcavity array, and the echo signal-to-noise ratio is larger than or equal to 15 dB; the scanning mechanism comprises a plurality of modes such as rotation, translation, multi-device array, human body movement, local limb movement, human body bearing support device movement and the like; the energy forms cover all types of light, electromagnetism, radio frequency and the like capable of generating a warm effect, including but not limited to non-contact or contact energy delivery modes. The traditional Chinese medicine composition is suitable for tumors, infections, inflammations, and all lesions sensitive to temperature of 42-47 DEG C including nervous system lesions such as amyotrophic lateral sclerosis, Alzheimer's disease, Parkinson's disease, multiple sclerosis and the like, is low in cost, free of radiation and easy to popularize, and has extremely high creativity and practical value.

Aspects of the present disclosure include methods for generating angularly deflected laser beams to illuminate a sample in a fluid stream. Methods according to certain embodiments include generating a first set of angularly deflected laser beams and a second set of angularly deflected laser beams, causing the first set of angularly deflected laser beams to propagate along a different optical path than the second set of angularly deflected laser beams, combining the first set of angularly deflected laser beams with the second set of angularly deflected laser beams and directing the combined sets of laser beams onto a sample in a fluid stream, and detecting light from the sample. Systems having a laser, an acousto-optic device, and an optical conditioning assembly configured to generate a first set of angularly deflected laser beams and a second set of angularly deflected laser beams are also described.

The invention relates to a multifunctional music therapeutic apparatus which comprises a main treatment module provided with a music treatment module, and the main treatment module further comprises a multi-mode physical treatment module, a physiological parameter monitoring module, an interaction and display module and a power supply and safety protection module. The system further comprises an auxiliary operation module, and the auxiliary operation module comprises a therapeutic scheme management unit, a self-adaptive adjustment unit, a data recording and analyzing unit and a safety early warning unit. The multi-mode physical therapy module comprises an acousto-optic stimulation unit, a low-frequency pulse unit and a vibration massage unit; the physiological parameter monitoring module comprises a heart rate / blood oxygen monitoring unit adopting the PPG technology and a forehead single-lead electroencephalogram monitoring unit, and the forehead single-lead electroencephalogram monitoring unit is used for collecting alpha wave and beta wave signals; the self-adaptive adjusting unit receives data of the physiological parameter monitoring module in real time. The multifunctional music therapeutic apparatus integrates multiple therapeutic functions, and the curative effect brought by music therapy can be greatly improved.

The application provides a distributed optical fiber acoustic wave sensing system and a pattern recognition method. The application relates to the fields of optical fiber sensing and pattern recognition, and the system comprises the following steps: continuous coherent light emitted by a narrow-line-width laser is split into two paths by a beam splitting fiber coupler, one path is used as local reference light, and the other path is used as probe light; the probe light is modulated into optical pulses in an acousto-optic modulator driven by a waveform generator, and the optical pulses are injected into a measured sensing optical fiber through a fiber loop; Rayleigh backscattering light returned through the measured sensing optical fiber is mixed with the local reference light through the fiber loop, and the mixed light is decomposed into two orthogonal polarized light beams in a polarization beam splitter and is transmitted to a first balanced photodetector and a second balanced photodetector respectively to be converted into electrical signals; and the two orthogonal interference electrical signals are synchronously collected by a data acquisition card and are sent to a host computer for demodulation. The application provides a new distributed acoustic wave monitoring method with high reliability and high generalization ability, and has extremely high engineering popularization value.