50 results about "Broadband laser" patented technology

The invention discloses an ultra-wideband laser radar inertial navigation cooperative SLAM (Simultaneous Localization and Mapping) method and system, which are suitable for robot positioning and mapping tasks in a GPS (Global Positioning System)-free environment. According to the method, high-frequency motion priori of an IMU, relative pose constraint of LiDAR and absolute ranging information of UWB are fused, a unified factor graph optimization model is constructed, and multi-sensor cooperative positioning is realized; in the system initialization stage, IMU bias calibration, UWB base station coordinate configuration and LiDAR initial attitude estimation are completed; in the operation process, IMU pre-integration is utilized to predict the pose, LiDAR point cloud registration is utilized to obtain the relative motion between key frames, UWB ranging is combined to construct a residual item, a self-adaptive weight mechanism is introduced to suppress ranging abnormity, and the fusion robustness is improved; the system supports geometric feature loopback detection, cross-frame constraints are constructed in combination with UWB to carry out closed-loop optimization, and an optimization result is used for real-time incremental updating of a global map; the method has the advantages of high positioning precision, strong anti-interference capability, wide application scene and the like.

According to the distributed fiber grating sensor provided by the invention, the optical pulse and the broadband laser are emitted in a time-sharing manner through the integrated composite light source module, and the cooperative monitoring of Raman scattering temperature measurement and Bragg grating stress measurement is realized on the same sensing optical fiber in combination with the optical path design of the wavelength division multiplexer and the optical circulator. According to the scheme, the high-temperature adaptability of the Raman scattering effect, namely a stable linear relation between molecular vibration frequency shift and temperature, is utilized, signals and stress are completely decoupled, the problem of cross sensitivity of a traditional single sensor is avoided, and independent measurement can be achieved without temperature compensation; meanwhile, a distributed measurement mode enables the sensor to still perform high-precision synchronous monitoring on temperature and stress in a high-temperature environment of 600-900 DEG C, so that the measurement process in an industrial complex scene is simplified, and the system reliability is improved.

The application discloses a kind of EFPI optical fiber sensor multi-sensor multiplexing temperature-pressure demodulation system and method, including ASE broadband laser, optical circulator, EFPI optical fiber sensor, 2-way wavelength division multiplexer, N-way wavelength division multiplexer, N-way wavelength division demultiplexer, photoelectric detector, FBG, 1*2 optical fiber coupler, optical spectrometer, data processing system;The input port input of the optical circulator is connected with ASE broadband laser, the output port cir2 is connected with two cascaded FBGs, the output port cir3 is connected with EFPI optical fiber sensor, the input port of 2-way wavelength division multiplexer is connected with the output port cir4 of optical circulator, and the output port is connected with N-way wavelength division multiplexer;N-way wavelength division multiplexer is accessed via the input port of 1*2 optical fiber coupler, and outputs two-way signals, one-way is connected with N-way wavelength division demultiplexer via N-way photoelectric detector and data processing system, and the other way is connected with optical spectrometer;N channels are connected by cascaded FBG, and the cascade of N EFPI optical fiber sensors is realized.

A compact LSP broadband light includes a gas containment structure containing a mixture of a first noble gas and a second noble gas, a filter tube positioned within the gas containment structure, an input window, and a pump source. The laser pump source directs an optical pump through the input window to sustain a plasma within the filter tube. The first noble gas absorbs broadband light within a first and a second wavelength band. The filter tube absorbs broadband light having a wavelength below a selected threshold. The absorption of broadband light by the first noble gas and the filter tube provide long-pass filtering to protect one or more downstream optical elements. The gas containment structure includes an output optical window for transmission of filtered broadband light. The gas containment structure includes a gas inlet and outlet for generating a reverse vortex flow pattern within the filter tube.

The invention provides a distributed optical fiber temperature sensor based on deep learning, and relates to the technical field of distributed optical fiber sensing. According to the sensor, a multimode optical fiber is adopted as a temperature sensing unit, a broadband laser light source is used for outputting laser, and a spectrograph is used for collecting spectral information of the multimode optical fiber at different positions and different temperatures. The collected spectral data is processed through the data preprocessing module, so that the spectral data is suitable for input of a neural network. And designing and training a deep learning neural network model, demodulating the spectral information by using the deep learning neural network model, and predicting the temperature of each position of the multimode optical fiber. The sensor overcomes the problems that a traditional distributed optical fiber temperature sensor is prone to noise interference, low in temperature resolution and slow in time response, has the advantages of being high in precision and high in real-time performance, and is widely suitable for temperature monitoring requirements in the fields of industrial automation, environment monitoring, electric power facility maintenance and the like.

The disclosure relates to an optical system comprising a laser source (1) which generates pulsed laser radiation consisting of a temporal sequence of laser pulses in an input laser beam (EL), a splitting element (2) which follows the laser source (1) in the course of the beam and splits each of the laser pulses into laser pulse replicas separated spatially and / or temporally from one another, a combination element (4) which follows the splitting element (2) in the course of the beam and superimposes the laser pulse replicas in a respective laser pulse in an output laser beam. It is the task of the disclosure to provide an improved optical system compared to the prior art. It should be possible to generate particularly short and thus spectrally broadband laser pulses of high power with the optical system. The disclosure proposes that at least one multipass cell (3) is arranged in the beam path between the splitting element (2) and the combination element (4), through which the laser pulse replicas propagate, wherein the multipass cell (3) contains a medium in which the laser pulse replicas undergo nonlinear spectral broadening.

The present invention relates to a laser scanning device and method based on on-chip soliton frequency comb without mechanical scanning. The laser scanning device includes a broadband laser, an arbitrary signal generator, an electro-optical phase modulator, a core frequency comb chip and a two-dimensional optical phased array chip; the output end of the broadband laser is connected to the light source input port of the electro-optical phase modulator, and the output port of the arbitrary signal generator is connected to the microwave signal input port of the electro-optical phase modulator; the waveform output port of the electro-optical phase modulator is connected to the input port of the core frequency comb chip, and the output port of the core frequency comb chip is connected to the input port of the two-dimensional optical phased array chip. The present invention utilizes the principle of frequency modulated continuous wave coherent ranging, generates parallel multi-channel light sources through frequency comb chips, combines optical phased arrays and gratings to achieve two-dimensional non-mechanical scanning, and adopts a planar array light scanning method, which has faster scanning speed, higher efficiency and longer detection distance.

This invention provides a self-heterodyne detection system capable of stably and over long periods of time measuring broadband laser linewidths. [Solution] The present invention discloses a self-heterodyne detection system. The system may include a frequency comb light source that generates light, a photodetector that detects the light, an electrical spectrum analyzer connected to the photodetector that analyzes the frequency and wavelength of the light using the detection signal of the photodetector, an interferometer including an input coupler provided between the frequency comb light source and the photodetector to receive the light, a branch waveguide branched by the input coupler, and an output coupler connected to the branch waveguide, and a programmable filter provided in the branch waveguide to select the peak wavelength of the light.

A spectral domain optical coherence tomography (OCT) system utilizes an electrowetting prism having four isolated electrodes and configured to deflect a light beam according to an actuating control signal applied to the electrodes. The control signal causes the light beam to laterally scan over a sample. The light beam is produced by a broad bandwidth laser and light from the sample and a reference path is provided to a spectrometer for analysis. The light source may be an all-normal-dispersion fiber laser seeding a gain-managed nonlinear fiber amplifier. The electrowetting prism is capable of scanning up to ±6°. The system is low power and operates at kHz speed.

The present invention discloses a method for actually measuring the attenuation coefficient of broadband laser ultrasonic Lamb waves in metal thin plates, belonging to the field of nondestructive testing. Data acquisition stage: Use a nanosecond laser to set a point source excitation on the surface of an aluminum alloy thin plate, and then use a scanning laser Doppler vibrometer (SLDV) to measure the wave field and collect linear wave field data. Data processing stage: Use the time-frequency analysis of continuous complex wavelet transform to obtain the time-frequency spectrum of the one-dimensional wave field signal. Determine the effective analysis range, including the time upper limit and the frequency upper limit. Extract the amplitude data represented by the intercept line. Attenuation characteristic analysis stage: Extract the peaks of the amplitude data at multiple distance points to obtain discrete points of the amplitude change with distance at a specific frequency. The present invention provides a method for actually measuring the attenuation characteristics of broadband laser ultrasonic Lamb waves. The solution of the attenuation coefficient provides an important theoretical reference for the calculation of the effective detection range and the selection of the filtering frequency of damage scattered waves.

The present invention belongs to the field of laser measurement, and specifically relates to a system and method for generating an optical frequency comb in the visible to mid-infrared band. The system comprises a fully polarization-maintaining fiber frequency comb module and a comb spectrum expansion module. The fully polarization-maintaining fiber frequency comb module is used to generate a broadband laser with uniform and coherent frequency and spectral line spacing. The comb spectrum expansion module is used to expand the spectrum of the frequency-locked broadband coherent light source to achieve the output of an optical frequency comb in the visible to mid-infrared band. The comb spectrum expansion module comprises an amplifier B, a 90:10 beam splitter, a fully polarization-maintaining compression fiber B, a fully polarization-maintaining compression fiber C, an 1100-2350nm supercontinuum unit, and a 500-1100nm supercontinuum unit. The output and shutoff of the 1100-2350nm near-infrared to mid-infrared laser are achieved by switching the circuit of the semiconductor laser diode unit C.

The present invention discloses a power OPGW optical cable data acquisition device and method based on distributed optical sensing technology, and relates to the technical field of optical cable data acquisition. The technical key points of the present invention include: the OPGW optical cable data acquisition device includes a broadband laser, a first wavelength division multiplexer, an acousto-optic modulator, a first erbium-doped fiber amplifier, a first circulator, a second wavelength division multiplexer, an optical fiber to be tested, a narrow line width laser, a first coupler, a pulse generator, a second erbium-doped fiber amplifier, a Raman amplifier, a first data acquisition card, a first photodetector, a third wavelength division multiplexer, a second coupler, a second circulator, a second photodetector, a first optical filter, a third circulator, a second optical filter, a microwave source, an electro-optic modulator, an optical attenuator, a third coupler, a third photodetector, and a second data acquisition card. The present invention can realize the synchronous acquisition of temperature, strain, vibration and attenuation signals of the OPGW optical cable by using one fiber core.

According to the laser wireless energy transmission device and method based on nonlinear spectrum broadening regulation and control, a laser meeting the nonlinear broadening excitation condition is adopted as a core light source, output light of the laser is coupled into a nonlinear photonic crystal fiber, and the nonlinear spectrum broadening regulation and control is achieved by precisely regulating and controlling microstructure parameters of the nonlinear photonic crystal fiber. The single-wavelength laser is converted into continuous wide-spectrum laser covering 600-1400 nm by using the synergistic nonlinear effect of the single-wavelength laser; after the wide-spectrum laser is emitted by the collimation system, the wide-spectrum laser is received by a multi-junction photovoltaic cell array of which the spectral response range is matched with the wide-spectrum laser in advance and is efficiently converted into electric energy. According to the invention, through a dynamic spectrum matching mechanism, the atmospheric transmission loss is significantly reduced, the full-spectrum response of a photovoltaic cell is fully utilized, long-distance, high-efficiency and high-stability wireless energy transmission is realized, and the system is especially suitable for application scenarios such as space energy, unmanned aerial vehicle charging and the like.

Methods and apparatuses are disclosed for true spectral flow cytometers that use wide band lasers to provide excitation light to cells, proteins, antibodies, and the like. Light from wide band lasers (emitting light through a continuous, wide bandwidth of wavelengths) is projected into a flow cell as a spread out spectrum to generate a spatially arranged spectrum that can excite a fluorescent response in cells passing through the flow cell to generate at least one excitation emission matrix (EEM) plot, wherein the EEM plot includes excitation wavelength, emission wavelength and fluorescence intensity.

A system having an illumination source configured to illuminate a target object using broadband laser light. A dispersive element is configured to spectrally separate light received from the target object into different colors A focal plane array (FPA) is configured to: (1) receive the light from the dispersive element; (2) acquire spatial information regarding the target object in one dimension in the plane of the FPA; acquire spectral information in a second dimension in the plane of the FPA, wherein the second dimension is perpendicular to the first dimension; (4) obtain information regarding a distance from the FPA to the target object by obtaining different times of flight of at least two wavelengths; and (5) detect a single photon of light, thereby hyperspectrally imaging the target object in three dimensions.

The invention relates to a detonation velocity measurement system and method, in particular to a system and method for measuring the detonation velocity of an explosive through an energy-type demodulation femtosecond fiber grating, and solves the technical problem that an existing method is difficult to realize precise positioning of an explosion wave surface and long-distance detonation velocity measurement. The system comprises a broadband laser, a circulator, a sensing grating string, a photoelectric detector and a control unit, the control unit is used for controlling the broadband laser to emit an optical signal, the optical signal is transmitted to the input end of the sensing grating string through the first terminal and the second terminal of the circulator and enters the third terminal through the second terminal after being reflected by the sensing grating string, and the third terminal transmits the optical signal to the input end of the photoelectric detector; the photoelectric detector converts reflected optical signals into analog electric signals in real time and sends the analog electric signals to the control unit, and the control unit is used for processing the analog electric signals to obtain the explosive detonation velocity. According to the method, the error of the arrival time point of the explosive shock wave of the explosive can be controlled within 1%.

A surface concave-convex height difference measuring system comprises an objective lens module, a broadband laser light source, a local light receiving assembly, a spectrograph and a concave-convex height difference analysis module. A conventional objective lens assembly of the objective lens module is controlled to be aligned with a concave-convex structure of an object to be measured. The broadband laser light source is used for providing a broadband laser beam which penetrates through the conventional objective lens assembly and is projected to a to-be-measured area of the to-be-measured object, and then a laser reflection beam comprising a central sub-beam and a peripheral sub-beam is reflected. The local light receiving assembly is used for receiving the central sub-beam so that the spectrometer can generate an optical frequency spectrum according to the central sub-beam, and the concave-convex height difference analysis module is further used for receiving the optical frequency spectrum so that the concave-convex height difference can be analyzed according to the optical frequency spectrum.

The invention relates to the technical field of electric power detection, in particular to an inverse piezoelectric optical voltage-temperature two-parameter measurement method. S1, obtaining a spectrum provided by a broadband laser source through a Gaussian equation; s2, receiving the spectrum of the broadband laser source through a voltage sensor; and S3, setting an FBG1 and an FBG2, simplifying the reflectivity of the FBG through a Gaussian equation, and calculating the reflectivity of the FBG in the FBG1 and the FBG2. According to the inverse piezoelectric optical voltage-temperature two-parameter measurement method provided by the invention, the voltage parameter and the temperature parameter are respectively obtained based on a double-grating demodulation and edge filtering mode of an inverse piezoelectric optical effect, so that simultaneous measurement of the voltage-temperature parameter is realized; the sensor has the characteristics of simple operation, strong passive anti-electromagnetic interference capability, guarantee of the working stability of the sensor, and no need of adding extra equipment or cost.

The invention discloses a calculation method for broadband laser frequency doubling conversion capability of gradient doped single crystals. The single crystal material with the axial gradient refractive index can realize a broadband laser high-efficiency frequency conversion process, and when a certain gradient doped single crystal has different refractive index gradient ranges, gradient sizes and single crystal thicknesses, laser wavebands and bandwidths for realizing high-efficiency frequency doubling are different. Through calculation and comparison of the three steps of the calculation method, the minimum gradient range and gradient size can be obtained, the blank of theoretical calculation of the gradient-doped single crystal in the field of broadband laser frequency conversion is filled up, the problems of refractive index parameters and gradient design of the gradient-doped single crystal are solved, and the method is suitable for industrial production. Under the same condition, the frequency doubling action distance is prolonged, the single crystal growth difficulty is reduced, the utilization rate and the frequency conversion efficiency of a single crystal material are improved, and theoretical guidance is provided for growth of gradient doped single crystals.

A tunable laser comprising at least two gain chips configured to generate light and a wavelength selection circuit. The wavelength selection circuit comprising a first waveguide coupled to a first gain chip of the at least two gain chips, a second waveguide coupled to a second gain chip of the at least two gain chips, a first wavelength selective photonic ring resonator optically coupled to the first waveguide, a second wavelength selective photonic ring resonator optically coupled to second waveguide, a third waveguide optically coupled to the first wavelength selective photonic ring resonator and the second wavelength selective photonic ring resonator; and a control circuit. The control circuit is configured to apply a first current to the first gain chip to bias the first gain chip, tune the first wavelength selective photonic ring resonator to a target wavelength, and tune the second wavelength selective ring resonator off-resonance.

A compact LSP broadband light comprises a gas confinement structure containing a mixture of a first noble gas and a second noble gas, a filter tube disposed within the gas confinement structure, an entrance window, and a pump source. The laser pump source directs an optical pump through the entrance window to maintain a plasma within the filter tube. The first noble gas absorbs broadband light within a first and a second wavelength band. The filter tube absorbs broadband light with a wavelength below a selected threshold. The absorption of broadband light by the first noble gas and the filter tube provides long-pass filtering to protect one or more downstream optical elements. The gas confinement structure includes an optical exit window for the transmission of filtered broadband light.The gas confinement structure includes a gas inlet and outlet to create a reverse vortex flow pattern within the filter tube.

The utility model provides a broadband laser polarization state regulation and control device based on a Fresnel prism, and relates to the technical field of laser polarization state regulation and control. The device comprises a half Fresnel rhombic prism and a quarter Fresnel rhombic prism which are sequentially arranged in a light path, the half Fresnel rhombic prism can rotate and is used for adjusting the linear polarization direction of incident laser, and the quarter Fresnel rhombic prism is used for adjusting the linear polarization direction of the incident laser. The quarter Fresnel rhombic prism is used for providing phase delay, and the quarter Fresnel rhombic prism and the quarter Fresnel rhombic prism are matched to realize laser polarization state regulation and control. The device solves the problem that height difference exists between emergent light and incident light of a quarter Fresnel prism, can more conveniently and accurately regulate and control the polarization state of laser in practical application, and ensures that the laser excites a sample at the same position.

An ultrasound (US) detection system is disclosed. The US system, comprising: a wideband laser source configured to emit a wideband laser beam; a wideband pulse laser generator; an array of optical resonators configured to be impinged by an acoustic wave, the array is in optical communication with the wideband pulse laser generator, such that laser pulses generated by the wideband pulse laser generator resonate in the array of optical resonators, and an array of photodetectors, each photodetector is in optical communication with at least one corresponding optical resonator and configured to detect a change in the intensity of at least one laser pulse in response to impingement by the acoustic wave.

The present application relates to the technical fields of biomass energy utilization and surface engineering protection, and discloses a kind of high-temperature corrosion resistant protective coating on the surface of biomass boiler pipeline and preparation method, the present application is aimed at the high-temperature pipeline of biomass boiler under the severe condition of high alkali metal and high chlorine, prone to high-temperature molten salt corrosion, existing protective coating is easy to peel off, insufficient corrosion resistance, short service life of core problem, design NiCoFeCrSiAlW high-entropy alloy protective coating, by accurately controlling the atomic percentage of each element, alloy powder is prepared by two-step mixing method, and a metallurgical bonded high-entropy alloy coating is formed on the surface of the pipeline substrate by wide-band laser cladding technology;The coating is a BCC single-phase solid solution structure, has excellent high-temperature oxidation resistance, molten salt and chlorine ion corrosion resistance, high bonding strength, excellent thermal shock resistance, can greatly reduce the corrosion rate of the pipeline, significantly improve the service reliability and service life of the biomass boiler pipeline.

The invention discloses a broadband spectrum laser pulse energy amplification method, and belongs to the technical field of ultrafast laser, and the method comprises the steps: sequentially carrying out the spectrum broadening, difference frequency and pulse time domain broadening of a titanium sapphire kilohertz laser pulse, and carrying out the pre-compensation of high-order dispersion introduced in the subsequent pulse energy amplification process; a double-chirp optical parametric amplification technology is utilized, a first wave band in the obtained infrared seed laser pulse is amplified to a first set value, a second wave band is pre-amplified to a second set value, and the first wave band is smaller than the second wave band; the chirped pulse amplification technology is utilized, a third wave band in the infrared seed laser pulse is amplified to a third set value, and the third wave band covers the long wave band in the first wave band and the second wave band; and performing pulse time domain compression on the output infrared seed laser pulse to obtain an infrared seed laser pulse with a near Fourier transform limit pulse width. According to the method, the high-peak-power single-optical-period infrared laser pulse can be obtained.

The application discloses a kind of ultra-wideband laser radar inertial navigation cooperative SLAM method and system, it is applicable to the robot positioning and mapping task under the environment without GPS.This method fuses the high-frequency motion prior of IMU, the relative pose constraint of LiDAR and the absolute ranging information of UWB, constructs unified factor graph optimization model, realizes multi-sensor cooperative positioning;System initialization stage completes IMU bias calibration, UWB base station coordinate configuration and LiDAR initial attitude estimation;In the running process, the relative motion between key frames is obtained by using IMU pre-integration prediction pose and LiDAR point cloud registration, combined with UWB ranging to construct residual term and introduce adaptive weight mechanism to suppress ranging anomaly, improve fusion robustness;The system of the application supports geometric feature loop detection, and combined with UWB to construct cross-frame constraint for loop optimization, and the optimization result is used for real-time incremental update of global map;The method has the advantages of high positioning accuracy, strong anti-interference ability, wide application scene, etc.

The present application provides a multi-wavelength laser for synchronously monitoring the temperature and pressure of an ocean. A pulse controller is used to convert a broadband laser outputted by a broadband laser source into a broadband pulsed light, and then a phase shifted fiber bragg grating unit is used to demodulate a plurality of pulsed light with different wavelengths from the broadband pulsed light. The pulsed light outputted by the laser is emitted into a sensing fiber in seawater via a wavelength division multiplexer, scattered light is returned to a control demodulation module via the wavelength division multiplexer, the control demodulation module demodulates the scattered light, so that the dynamic pressure is parsed according to a phase change of a light signal, and the seawater temperature is parsed according to a wavelength change of the light signal.

A traceability method and device for a broadband laser vibrometer calibration device disclosed by the present invention belong to the technical field of optoelectronic measurement. The device of the present invention includes a laser vibrometer, a first polarization beam splitter, a first acousto-optic modulator, a λ / 4 wave plate, a second polarization beam splitter, a λ / 2 wave plate, a second acousto-optic modulator, a concave mirror, a first sine signal source, an FM signal source, a second sine signal source, a plane mirror, a third polarization beam splitter, a photodetector, a filter amplifier, a data acquisition system, and an electronic computer. The present invention uses the laser frequency and the measurement laser for calibrating the laser vibrometer to perform heterodyne beat frequency, completing the down-conversion of the optical frequency signal; there is no need to use external resources to obtain the FM signal waveform in the radio frequency range. After using the data acquisition system to collect the FM signal in this radio frequency range, the standard vibration quantity value and vibration frequency value reproduced by the broadband laser vibrometer calibration device are obtained by using the FM signal demodulation method, realizing the effective traceability of its quantity value.

The invention is suitable for the technical field of optics, and provides an ultrafast random speckle generation system, device and method. The ultrafast random speckle generation system comprises a mode-locked pulse laser module which generates a high-repetition-frequency femtosecond-scale broadband laser pulse optical signal; the DFT module broadens the broadband laser pulse optical signal of the femtosecond scale, so that the time domain signal and the frequency domain wavelength of the broadband laser pulse optical signal have a one-to-one corresponding linear relation; the wavelength adjusting module enables the frequency domain wavelength of the broadband laser pulse optical signal to have an interference phenomenon; the speckle generation module enables broadband laser pulse optical signals with different wave crest wavelengths to generate mode interference in a two-dimensional space; and the speckle detection and calibration module performs data detection, and performs data acquisition according to wavelength information at the wave crest and random speckle distribution to complete image data processing. According to the invention, the number and speed of random speckle generation are adjusted, and the problem that the spatial modulation of single-pixel imaging is too slow is solved.

A multispectral laser detection and ranging device including a spectral delay unit configured for delaying the broadband laser beam pulse depending on the wavelength, to give a wavelength comb selected in the spectral range, such that the broadband laser beam pulse is transformed into a pulse-train wherein each pulse in the train is at a different wavelength of the wavelength comb.