544 results about "Pulse light" patented technology

The invention provides a sensing system fusing optical fiber vibration and acoustic emission, a monitoring method and a device, and relates to the technical field of optical fiber sensing. The device comprises a light source module, a sensing optical fiber, a detection module and a controller, the light source module is used for respectively emitting modulation pulse light for vibration monitoring and continuous wave laser for acoustic emission monitoring; the sensing optical fiber is arranged along a monitored structure or area, and at least one optical fiber acoustic emission sensing head is connected to the optical fiber in series. The detection module collects Rayleigh scattering light and beat frequency signals at all positions in the sensing optical fiber through a circulator and a coherent light receiver, and optical signals are converted into electric signals; wherein the electric signals comprise vibration electric signals and acoustic emission electric signals; the signal processing unit carries out phase demodulation and envelope analysis processing on the collected vibration electric signals and acoustic emission electric signals so as to obtain vibration waveforms and acoustic emission event space-time information along all points of the optical fiber. According to the invention, a monitoring task fusing vibration and acoustic emission can be accurately completed.

An optical path testing device and an optical path testing method divide output light from a laser light source into a probe optical path and a local optical path and convert modulated light obtained by modulating input light of the probe optical path into probe light including pulsed light, generate a beat signal by causing signal light and input light of the local optical path to interfere with each other, acquire a signal indicating backscattered light in the optical fiber on the basis of the beat signal, and analyzes a loss distribution, generate the modulated light by performing, on the output light, modulation based on a frequency changing from a start frequency to an end frequency, generate an analysis signal by averaging the backscattered light in each different frequency band included in the beat signal between the different frequency bands and acquire the loss distribution.

An intelligent automatic intense pulsed light therapeutic apparatus relates to the technical field of intense pulsed light therapy and comprises a therapeutic apparatus body, an auxiliary mechanism, an adjusting mechanism and a clamping mechanism, the therapeutic apparatus body is formed by combining a lower shell, a middle frame and an upper shell, a control panel is placed in the middle frame, and the clamping mechanism is arranged on one side of the middle frame. The middle frame is movably connected with a connecting wire harness through a clamping mechanism, the connecting wire harness is connected with external therapeutic equipment, an adjusting mechanism is arranged in the middle frame, and an auxiliary mechanism is arranged on the side, away from the connecting wire harness, of the middle frame; the clamping mechanism of the device adopts a ball and spring linkage design, so that quick insertion and extraction and stable locking with external equipment are realized; the auxiliary mechanism enables the detachable probe to be mounted conveniently and has an automatic dustproof function through structures such as a guide rail and a limiting frame; the adjusting mechanism is driven by an eccentric wheel, the light spot size and the energy density can be accurately adjusted according to the pressing degree, and the problems that traditional equipment is unstable in connection and a probe is inconvenient to replace are effectively solved.

The invention relates to the technical field of intelligent household appliances, and provides a refrigerator sterilization method and device, a refrigerator, equipment, a medium and a program product.The method comprises the steps that it is determined that the standby duration of a pulse function module is larger than first preset duration, and a sterilization signal is generated; and sending a sterilization signal to the pulse function module, wherein the sterilization signal is used for indicating the pulse function module to emit pulsed light in the refrigerator according to the sterilization mode. The standby duration of the pulse function module is timed, and when the duration that the refrigerator is not sterilized exceeds the preset duration, the sterilization signal for triggering the pulse function module to sterilize is automatically generated, so that when a user forgets to sterilize or feels that sterilization is too troublesome to manually start, the sterilization signal is automatically generated; and the pulse function module is controlled to automatically sterilize in the refrigerator, so that the food materials are prevented from breeding bacteria in the refrigeration process, and the food materials and the interior of the refrigerator are effectively guaranteed to be clean.

The invention discloses a system and method for generating, regulating and controlling a partially coherent space-time light field. The system comprises a pulse shaping assembly composed of a plurality of optical elements and an incident light source used for providing a completely coherent ultrafast pulse light field. An optical element in the pulse shaping assembly comprises a first blazed grating, a first cylindrical lens, a two-dimensional dynamic holographic modulator, a second cylindrical lens and a second blazed grating which are sequentially arranged in the light field propagation direction. The focal lengths of the first cylindrical lens and the second cylindrical lens are the same, and the distance between the adjacent optical elements is equal to the focal lengths of the first cylindrical lens and the second cylindrical lens; the two-dimensional dynamic holographic modulator is used for loading a specific complex amplitude modulation function to reconstruct the spatial-spectral characteristics of the light field. According to the invention, the two-dimensional space-spectrum function of the pulse is dynamically modulated, the generation of the partially coherent space-time wave packet is realized, and the amplitude and structure distribution of the space-time coherence can be designed and regulated as required.

The invention belongs to the technical field of reservoir calculation, and relates to a multi-dimensional pulse reservoir calculation method and system based on a semiconductor laser. The multi-dimensional pulse reservoir calculation method comprises the following steps: encoding a signal to be processed to generate an original optical signal; injecting the original optical signal into a semiconductor laser, and collecting a spike pulse optical signal containing to-be-processed signal feature information generated by the semiconductor laser under excitation of the original optical signal; performing photoelectric conversion on the spike pulse optical signal to obtain a time domain signal; amplitude features, quantity features and time position features of spike pulses in the time domain signals are extracted, and amplitude feature virtual nodes, quantity feature virtual nodes and time position feature virtual nodes are constructed; splicing the amplitude feature virtual node, the quantity feature virtual node and the time position feature virtual node to obtain a reserve pool state vector of an extended dimension; and obtaining an output signal of the multi-dimensional pulse reservoir calculation system based on the reservoir state vector of the extended dimension.

A hair removal device includes a housing, a pulse light source, an air duct, and a fan. The fan is hollow inside. The housing is provided with a light outlet, an air inlet and an air outlet. The pulse light source is provided inside the housing, pulse light emitted by the pulse light source is emitted from the light outlet; an air duct is provided in the housing and in communication with the air inlet and the air outlet, and the air duct passes through two sides of the pulse light source, respectively; and the fan is provided within the air duct for generating an airflow, to make the airflow enter from the air inlet and pass through the air duct and exit from the air outlet. A portion of the air duct is provided on two sides of the pulse light source.

The utility model relates to the technical field of coated glass detection, in particular to a coated glass film surface detection device, which comprises a light emitting unit, a light receiving unit, a signal detection unit and an alarm unit, the light receiving unit receives the reflected light and converts the reflected light into an electric signal, whether the film surface direction of the coated glass is correct or not is judged through processing and logic analysis of the signal detection unit, if so, an instruction is sent to the alarm unit, and the alarm gives an alarm while the glass conveying production line is paused; according to the invention, data signal acquisition and processing of the two surfaces of the coated glass can be completed synchronously, the detection efficiency and the applicable type of the coated glass are greatly improved, interference of local defects of the glass and ambient light on a detection result is eliminated, and the detection accuracy is improved.

The invention belongs to the technical field of agricultural machinery and intelligent control, and particularly relates to an intelligent precise weeding robot based on multispectral recognition. The robot aims at solving the problems that in the prior art, due to visible light morphological recognition, the forms of crops and weeds are similar, and the recognition precision is low and the robustness is poor in the complex field environment. The robot comprises an autonomous mobile platform and a sensing operation assembly, the sensing operation assembly integrates a multi-mode sensing unit, a data fusion and decision core and a high-energy thermal ablation module, and the multi-mode sensing unit provides eight narrow-band pulse light with specific wavelengths through an active light source illumination module. Realizing synchronous acquisition of spectrum and space information by combining multispectral imaging and three-dimensional profile measurement; the data fusion and decision core performs registration, segmentation and classification on multi-source data to generate weed target coordinates; and the high-energy thermal ablation module implements 1470-nanometer laser accurate ablation based on the coordinates, and verifies the operation effect in real time through coaxial infrared thermal imaging. By means of the technical scheme, high-confidence-coefficient distinguishing and millimeter-level lossless precise weeding of crops and weeds in the complex farmland environment can be achieved.

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

The invention belongs to the technical field of 3D printing, and particularly relates to a continuous pulse mixed type patterning laser powder bed light path system and method.Laser powder is preheated to be close to a melting point but not molten through set continuous-period light emitting, the preheated laser powder is completely molten through pulse-period light emitting, and in other words, the continuous pulse mixed type patterning laser powder bed light path system and method are obtained; continuous light is only used for preheating powder for a short time, so that the powder is close to a melting point but not molten; then peak energy is rapidly provided through microsecond pulsed light, powder melting is completed instantly, in this way, the effective heating time is shortened, the heat radiation range of heating is controlled, the heating time of a system is far shorter than the heating time of traditional continuous light, melting and solidification are completed when heat is not diffused out of a preset pattern in time, and the production efficiency is greatly improved. Therefore, the fusion area is limited within the pattern range, the subsequent part forming precision is improved, and laser loss caused by too high peak power due to short time is reduced through pulse light emitting and continuous light emitting.

A distance measurement device includes a light emitter for transmitting pulsed light and a light receiver for detecting reflected light from an object, providing an output signal. The device has at least one of a circuit or a processor with memory storing executable computer program code. The circuit or processor calculates an object distance using the time of flight of the pulsed light. Additionally, a histogram representing received light intensity for each time of flight is generated from the output signal. The device determines whether the object is within a short-distance range based on the timing of a peak in the histogram, and calculates the object distance using both a feature value related to the number of light reflections and the timing of the peak's decline.

An electronic device comprises a housing configured to contact a user's skin, an optical transmitter array, an optical receiver, a memory element and a processing element. The optical transmitter array outputs a plurality of optical signals that pass through the user's skin, each of the plurality of optical signals having one of three wavelengths. The optical receiver receives the optical signals and generates corresponding photoplethysmogram (PPG) signals. The memory element stores absorption constants for deoxyhemoglobin blood content, oxyhemoglobin blood content and glycated hemoglobin blood content, each absorption constant associated with one of the first wavelength, the second wavelength or the third wavelength. The processing element determines a glycated hemoglobin blood level for the user based on a ratio of a determined glycated hemoglobin blood content to a sum of determined deoxyhemoglobin blood content, a determined oxyhemoglobin blood content and a determined glycated hemoglobin blood content.

The utility model discloses an intensive pulse light disinfection and sterilization device for secondary tap water supply and a community direct drinking water system, and belongs to the technical field of water treatment equipment. Comprising a water inlet connector, a water storage tank body, a water outlet connector and a pulsed highlight germicidal lamp set, the water inlet connector and the water outlet connector are arranged on the water storage tank body in a spaced mode and both communicated with an inner cavity of the water storage tank body, and the pulsed highlight germicidal lamp set is arranged between the water inlet connector and the water outlet connector. The irradiation part of the pulsed intense light sterilization lamp group is mounted in the inner cavity of the water storage tank body in a water sealing and insulating manner; and the wavelength of a sterilization and disinfection spectrum emitted by the pulsed intense light sterilization lamp group is 200-1100nm. The pulsed strong-light sterilizing lamp set is adopted to irradiate the flowing water body, so that the water body can be efficiently sterilized and disinfected, harmful microorganisms are killed, the water body in the secondary water supply and the direct drinking water system in the residential area is ensured to be non-toxic and sterile, and the disinfection and sterilization problems of the water body in the secondary water supply and the direct drinking water system in the residential area can be ideally solved.

A range imaging device includes a light source unit that emits light pulses to a measurement space; a light-receiving unit including a photoelectric conversion element that generates charge according to light incident from the space, a pixel circuit including charge storage units in which the charge is integrated in a frame cycle, and a pixel drive circuit that performs switching operation of transfer transistors to distribute the charge to the storage units for integration at integration timing synchronizing with emission of the pulses; and a distance calculation unit that calculates a distance between object in the space and the light-receiving unit based on charge determined by a first charge integrated in each storage unit. The calculation unit calculates the distance by subtracting a second charge from each first charge, the second charge being noise charge as an integrated charge other than the charge distributed and integrated by the switching operation.

In a ranging device, a characteristic setting unit is configured to extract, from one or more pieces of received-light information representing changes with time in amount of received light acquired by the light receiving unit, at least one of a received-light amount range and a light reception time range of pulsed light other than emitted light from the light emitting unit, as a specified range. A received-light integration unit is configured to generate integrated received-light information by integrating the received-light information on a time axis with emission timings matched over a plurality of light receptions. A distance calculation unit is configured to exclude or identify distance noise formed of pulsed waveforms arising from pulsed light other than the emitted light, using the specified range extracted by the characteristic setting unit, and calculate a distance to the object reflecting the emitted light.

Implementations disclosed describe, among other things, a sample inspection system that includes an illumination subsystem to illuminate a sample with a plurality of time-spaced light pulses generated, using a pulse multiplexing system, from a source light pulse. The pulse multiplexing system includes a plurality of optical loops, each deploying an optical coupler that outputs a first portion of incident light to a sample and provides a second portion of incident light as an input into the next optical loop. The sample inspection system further includes a collection subsystem to collect a portion of light generated upon interaction of the plurality of time-spaced light pulses with the sample, and a light detection subsystem to detect the collected portion of light.

The embodiment of the application provides a kind of super-short pulse X-ray excited magnetic particle acoustic imaging method and system, the system includes: X-ray signal transmitting module, for responding to control instruction, control X-ray generator generates the X-ray pulse of preset parameter, so that the X-ray pulse acts on the magnetic particle mark region of pre-setting;Magnetic field modulation module is used to modulate the magnetic field of the magnetic particle mark region to make the X-ray pulse act on magnetic particle and produce original acoustic signal matched with magnetic field modulation;Acoustic detection module is used to convert the original acoustic signal into original data signal;Signal processing module is used to receive the original data signal, and the original data signal is processed to obtain imaging result.The super-short pulse X-ray excited magnetic particle acoustic imaging method and system of the application can meet long-term monitoring demand, effectively distinguish between viable cells and free magnetic particles, avoid misjudgment, and provide complete information for diagnosis and treatment.

The invention provides a dynamic monitoring system and method for a submarine optical cable array reservoir, which is applied to the technical field of marine geophysical prospecting, and comprises a wet-end subsystem positioned underwater and a dry-end subsystem positioned on a base bank, the dry end subsystem comprises a light source module used for generating an optical signal; the modulation transmitting module is used for modulating the optical signal to obtain modulated pulse light; the underwater wet end subsystem comprises an optical cable transmission module used for transmitting modulation pulse light; the optical fiber four-component node module is used for dynamically and continuously monitoring the reservoir for a long time, and modulating the acquired sound pressure signal and the triaxial vibration signal onto the modulated pulse light in response to the received modulated pulse light to form a return light signal; the dry end subsystem further comprises a modulation-demodulation module used for receiving the return optical signal and demodulating the return optical signal to obtain four-component monitoring data. According to the invention, sound pressure and three-axis vibration response can be integrated on the same node, and passive four-component synchronous acquisition is realized.

The application discloses a single-photon laser radar coaxial light path stray light suppression method, belongs to the technical field of laser radar detection, and is used for stray light suppression and comprising the following steps: a main control module triggers a laser to emit linearly polarized pulse light beams; the linearly polarized pulse light beams are projected to an underwater target through a beam expander, a 45-degree open hole reflector and a two-dimensional scanning galvanometer; echoes are reflected to the 45-degree open hole reflector through the galvanometer; after converging through a focusing lens group and a narrow-band optical filter, the echoes penetrate a small aperture diaphragm; closed-loop attenuation control is performed on the echoes after penetration; and a two-dimensional depth map of the underwater detection target is obtained. Through the collection of light intensity voltage changes and the cooperation of an extreme value optimization algorithm, the motor is dynamically tracked and controlled to orthogonally intercept random flares, the water surface flare and internal stray light are suppressed to a very low level, the detection capability of the system for effective echoes is improved, and the stability of target depth information extraction and two-dimensional distance reconstruction is effectively improved.

A control method for a beauty device, a beauty device, and a computer-readable storage medium are provided. The beauty device includes a light-emitting apparatus. The control method includes: within a light-emitting window, controlling the light-emitting apparatus to generate a first pulsed light that irradiates a skin of a user, and controlling the light-emitting apparatus to generate a second pulsed light that irradiates the skin of the user after irradiation of the first pulsed light has stopped for a first preset duration. A ratio of an energy of the first pulsed light to an energy of the second pulsed light is less than 1, and the first preset duration is less than or equal to 3 milliseconds, to allow the first pulsed light and the second pulsed light to realize energy accumulation.

By utilizing soliton self-frequency shift modulation, the formation of multiple pulsed light beams is suppressed, while the occurrence of ASE (Autonomous Emission Reduction) is suppressed, and the modulated pulsed light beam is reliably amplified. [Solution] The pulsed light generation device 100 comprises an oscillator 1 that oscillates pulsed light L, a fiber amplifier 2 located downstream of the oscillator 1 in the optical path of the pulsed light L, a soliton shift fiber 5 located downstream of the fiber amplifier 2 in the optical path of the pulsed light L, a branching section 8 located downstream of the fiber amplifier 2 in the optical path of the pulsed light L, and a short-wavelength fiber amplifier 11 located downstream of the soliton shift fiber 5 and the branching section 8 in the optical path of the pulsed light L.

To provide an exposure apparatus which maintains productivity and exposure performance at the time of a plurality of wavelengths equal to those at the time of a single wavelength.SOLUTION: An exposure apparatus includes a light source capable of emitting pulsed light of a plurality of wavelengths, a characteristic data division unit configured to acquire time-division information from the light source and divide characteristic data for each wavelength based on the time-division information, and a calculation unit configured to calculate an exposure condition based on the characteristic data divided by the characteristic data division unit.SELECTED DRAWING: Figure 1

The invention relates to the technical field of ultrafast laser, and discloses a negative chirp management method and device of a laser and a medium. The method comprises the following steps: pre-processing a seed pulse, outputting the seed pulse through a mode-locked optical fiber oscillator, and primarily amplifying the seed pulse through a single-mode gain optical fiber; temperature tuning negative chirp introduction is carried out, a chirp fiber grating is packaged in a temperature tuning device, and the temperature of a semiconductor chilling plate is linearly increased within a preset range, so that the second-order dispersion amount of the chirp fiber grating is changed, and controllable negative chirp is introduced into a pulse; carrying out nonlinear amplification and spectrum broadening, inputting the pulse introduced with the negative chirp into a multimode gain fiber, injecting pumping energy into the multimode gain fiber, and broadening the pulse spectrum width to be greater than a preset width by utilizing the synergistic effect of self-phase modulation, dispersion and gain; pulse width compression is carried out, and the pulse after spectrum broadening is adjusted through a transmission-type grating pair compressor, so that the ultra-narrow pulse width is obtained.

A ranging device includes: a light emission control unit configured to control a light emitting unit that emits a pulse light according to a light emission condition; a light receiving unit configured to detect reflected light emitted from the light emitting unit and reflected by an object and convert the reflected light into a pulse signal; a holding unit configured to hold frequency distribution information in which a count value of the pulse signal is associated with each of a plurality of bin periods obtained by dividing a period from an emission timing of the pulse light to a measurement end timing of the reflected light; and a determination unit configured to determine the light emission condition based on the frequency distribution information.

The application discloses a constant-tension-based textile multidirectional tensile strength automatic testing device and method, relates to the tensile strength detection technical field, and comprises a rigid frame system; a high-elastic fabric optical response mechanism is integrated on a double-column portal frame of the rigid frame system and is used for reacting fiber damage processes through light transmittance and light spot change of the fabric; the high-elastic fabric optical response mechanism comprises a sealed light isolation component, a light source component and an imaging component; the light source component comprises a pulse LED light source array, a lampshade and a horizontal movement driving unit which are equidistantly arranged along a fabric stretching direction. The application improves the prior art which can only record the limit value when a sample is completely broken and cannot capture microcracks generated by fiber step-by-step failure in a stretching process when the fabric tensile strength is detected. The application has the advantages that the fiber breaking process in the fabric can be directly reflected through light spot change formed by light penetration of the fabric when the fabric tensile strength is detected.

The invention discloses a pulsed light hair removal system based on spectrum conversion and a control method thereof. The system comprises a pump light source module, a spectrum conversion module, an image acquisition module and a processor. The system provided by the invention has a pixel-level accurate control capability, the accuracy is greatly improved compared with the traditional IPL, and pixel-level energy self-adaption is realized, so that personalized treatment is supported. The system also supports sliding continuous irradiation, can greatly shorten the treatment time, has the advantages of high energy efficiency ratio, small invalid irradiation area, low pain feeling and the like, and can effectively reduce unnecessary thermal stimulation.

The application provides an X-ray ultrafast imaging system and method based on radiation conversion and spectral filtering, which solves the problems of poor universality, low time resolution or limited number of frames in existing X-ray ultrafast imaging technology. The system comprises an X-ray coupling module for coupling target X-ray signals to image on a semiconductor chip module, a semiconductor chip module for converting the X-ray intensity space-time distribution into the chip refractive index space-time distribution, a chirped pulse light generation module, a chirped pulse light coupling module for irradiating linear chirped pulse light generated by the chirped pulse light generation module to the semiconductor chip module and coupling the pulse light reflected by the semiconductor chip module into a phase extraction module, the phase extraction module, a spectral filtering frame reading module for imaging the linear chirped light intensity space-time distribution signal output by the phase extraction module into the data acquisition module, the data acquisition module and an image processing module for processing the image output by the data acquisition module.

The application belongs to the field of weak grating demodulation, and relates to a system and method for monitoring downhole temperature and vibration of an oil and gas well, comprising a laser emission module, a weak grating array, a CCD module, an interference coupling module and an acquisition module, wherein the laser emission module is used for emitting a pulsed light signal and inputting the pulsed light signal into the weak grating array; the weak grating array is used for generating emitted light; the CCD module is used for receiving a part of reflected light signals and transmitting the reflected light signals to the acquisition module; the interference coupling module is used for receiving another part of the reflected light signals, generating FBG-FP interference signals and transmitting the FBG-FP interference signals to the acquisition module; and the acquisition module is used for obtaining downhole temperature and / or stress characteristics through the reflected light signals and vibration characteristics through the FBG-FP interference signals. The system can simultaneously acquire reflected wave wavelength signals and FBG-FP interference signals, and simultaneously monitor physical quantities such as temperature, stress and vibration.

The invention provides a system and method for enhancing the spectrum demodulation rate of a dual-optical-frequency comb, and the system comprises a circulation light path which carries out the light splitting of excitation pulse light which is inputted to the circulation light path and corresponds to a first repetition frequency, thereby enabling one part of the excitation pulse light to be outputted towards a unit to be detected, and enabling the other part of the excitation pulse light to circulate along the circulation light path; the to-be-tested unit is used for modulating the excitation pulse light and outputting processing signal light carrying dynamic spectrum information generated based on an actual dynamic spectrum of the to-be-tested unit; the light combining unit is used for coupling the processing signal light and the sampling pulse light and outputting coupled signal light; the photoelectric detector performs light field cross-correlation-based detection on the coupled signal light and outputs a periodic electric signal; and the data acquisition and processing unit processes the periodic electric signal to obtain an actual dynamic spectrum corresponding to the unit to be detected. The detection efficiency is at least improved.