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50results about How to "Realize long-distance detection" patented technology
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Distributed optical fiber vibration sensor
InactiveCN102168808AImprove accuracyStable interference outputPipeline systemsPhotodetectorMach–Zehnder interferometer
The invention discloses a distributed optical fiber vibration sensor. The distributed optical fiber vibration sensor is characterized in that: on the basis of the optimized combination of the interference principles of a Sagnac interferometer and a Mach-Zehnder interferometer, the distributed optical fiber vibration sensor comprises a signal processing device, a first sensing optical fiber, a second sensing optical fiber, a third sensing optical fiber, a wideband light source, a narrowband light source, an optical circulator, a first optical wavelength division multiplexer, a second optical wavelength division multiplexer, a first coupler, a second coupler, a third coupler, a fourth coupler, a Faraday rotating mirror, a first photodetector, a second photodetector, a third photodetector and an optoisolator. The distributed optical fiber vibration sensor has a simple structure and can be used for monitoring outside disturbance and positioning multi-point interferences in real time; the demodulation work is relative simple and polarization maintaining optical fibers can be prevented from being used; and by adopting the Faraday rotating mirror, the phenomenon of polarization state fading due to double refraction can be also compensated.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Remote traffic sign detection and recognition method based on F-RCNN
ActiveCN110163187ARealize long-distance detectionTimely responseCharacter and pattern recognitionNeural architecturesLearning machineFeature vector
The invention relates to a remote traffic sign detection and recognition method based on F-RCNN, which comprises: 1, preprocessing the traffic sign image sample set; 2, pre-training VGG-16 in F-RCNN;3, inputting the traffic sign training data set to the VGG-16 to complete feature extraction; 4, constructing a fusion feature map; enabling the region generation network RPN in the F-RCNN to performregion generation according to the fusion feature map to obtain a candidate region of the traffic sign; 6, inputting all candidate regions to the RoI-Pooling layer in the F-RCNN to generate a fixed-size feature vector; 7, sending the feature vector to the extreme learning machine network to output the category and location of the traffic sign; 8, training the F-RCNN model by the contribution adaptive loss function; 9, completing the traffic sign detection and identification of the actual scene. The invention realizes the detection and identification of the long-distance traffic sign, and the recognition precision is high.
Owner:NORTHEAST GASOLINEEUM UNIV
Far-distance human-body-hiding hazardous article detector based on radar target polarization characteristic
ActiveCN105866850AHigh frequencyHigh precision measurementOptical detectionDetection using electromagnetic wavesFrequency bandPhysics
The invention discloses a far-distance human-body-hiding hazardous article detector based on the radar target polarization characteristic. The detector comprises a display control end, a signal processing and control module, a linear frequency modulation source module, a transceiving frequency doubling link module, a clock distributing module, a medium-frequency amplification filtering module and a signal acquisition module. The linear frequency modulation source module provides linear frequency modulation signals to the transceiving frequency doubling link module. The transceiving frequency doubling link module conducts frequency doubling and amplifying on the linear frequency modulation signals provided by the linear frequency modulation source module so that the frequency of the linear frequency modulation signals can reach the designated frequency band and the linear frequency modulation signals can irradiate a detected object, reflection echoes of the detected object are received, processed and then transmitted to the medium-frequency amplification filtering module and finally return to the display control end. The display control end counts the distribution of strength values of two perpendicular routes of echoes of the detected objects according to the received multi-acquisition data, so whether the detected object carries a hazardous article or not can be effectively detected, far-distance detection can be achieved, security check can be conducted on high-density people in open places, and the detected object does not need to cooperate actively.
Owner:INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
Two-way time reversal damage imaging method based on ultrasonic guided-wave
ActiveCN105510444AIncrease signal amplitudeImprove signal-to-noise ratioAnalysing solids using sonic/ultrasonic/infrasonic wavesSonificationElement model
The invention discloses a two-way time reversal damage imaging method based on ultrasonic guided-wave. The method comprises the following steps: carrying out active stress wave detection on a damaged object by the use of a modulated excitation signal, and synchronously acquiring signals at a transmission end and a reflective end of a detected area; carrying out frequency dispersion compensation separation on the acquired signals, and separating longitudinal mode guided wave and bending mode guided wave; extracting the longitudinal mode guided wave in the separated signals, carrying out time reversal treatment, and amplifying the reversed signal; carrying out simulation reversal by importing the reversed signal into a finite element model, extracting displacement values of all point clouds and moments in the model, and carrying out time and space focusing treatment to obtain a vibration cloud map; and defining a space curve to convert the vibration cloud map into a three-dimensional color map, and carrying out damage imaging by three-dimensional color point cloud. According to the method, characteristics of damages are analyzed from an overall perspective, and different mode guided waves are innovatively extracted to carry out time reversal analysis of transmission and reflective ends simultaneously. The method of the invention has important academic value and practical significance.
Owner:SOUTH CHINA UNIV OF TECH +1
Novel composite sensing optical cable
InactiveCN104183334ALarge resistanceUniform heatingCommunication cablesCross connectionTemperature measurement
The invention discloses a novel composite sensing optical cable comprising a carbon fiber filament, temperature-sensitive fibers, power supply wires, a sheath, and an insulating wrapping layer. The carbon fiber filament, the temperature-sensitive fibers, the power supply wires, and the sheath are wrapped in the insulating wrapping layer. The carbon fiber filament is wrapped in the sheath. More than one temperature-sensitive fiber and a pair of the power supply wires are provided. The carbon fiber filament and the surrounding power supply wires are in crossed connection so as to form a parallel circuit. Power is supplied simultaneously such that the optical cable is uniformly heated at long distance by means of a fact that the carbon fiber filament generates heat after being supplied with power. The temperature-sensitive fibers are wrapped in the carbon fiber filament or arranged in parallel with the carbon fiber filament. The carbon fiber filament is heated after being supplied with power so as to uniformly heat the optical cable. Temperature measurement at various points along the cable is achieved by means of distributed fiber temperature measurement technology. The optical cable can be uniformly heated for long distance (more than 2km) and long-distance leakage can be detected.
Owner:SUZHOU NANZEE SENSING TECH
Wide-field-of-view and large-depth-of-field variable-resolution non-scanning streak tube laser imaging system
InactiveCN107422336AIncrease vertical rangeSolve the problem of laser imaging with large depth of fieldElectromagnetic wave reradiationVariable resolutionDistance detection
The invention relates to a wide-field-of-view and large-depth-of-field variable-resolution non-scanning streak tube laser imaging system, and belongs to the technical field of photoelectric imaging. The system mainly comprises a pulse laser, transmitting and receiving optical systems, a reflecting mirror, a micro-lens array, an optical fiber image bundle, streak tubes I / II, CCD cameras I / II and a control and processing system. The basic principle is that the pulse laser emits laser pulses, the laser irradiates to a target object through the transmitting optical system and the reflecting mirror, and the reflected laser is received by the receiving optical system and forms an image on the micro-lens array. The image plane is non-uniformly sampled by the micro-lens array and the optical fiber image bundle and then coupled to the photoelectric cathodes of the two streak tubes, the two CCD cameras acquire the streak image on two fluorescent screens and transmit the streak image to the control and processing system, and finally the intensity image and the distance image of the target can be obtained through the algorithm. The contradiction among the high spatial resolution, long distance detection, wide field of view and large depth of field of the non-scanning streak tube laser imaging radar can be solved.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Three-dimensional scanning laser radar based on MEMS micromirrors
ActiveCN108983197ASmall sizeRealize long-distance detectionWave based measurement systemsRadarDistance detection
The invention belongs to the technical field of laser radars, and discloses a three-dimensional scanning laser radar based on MEMS (Micro-Electro Mechanical System) micromirrors. The three-dimensionalscanning laser radar based on MEMS micromirrors includes an emitting laser, a collimated optical element, an MEMS micromirror array and a detector, wherein a detection laser signal emitted by the emitting laser is collimated by the collimated optical element to the MEMS micromirror array, and then is emitted to a detection target through the MEMS micromirror array; the detection laser signal reflected by the detection target is received by the detector; and the MEMS micromirror array includes a plurality of small micromirror units which are arranged in a two-dimensional array, and all the small micromirror units are rotatable in the three-dimensional direction. The design of replacing a single small-sized MEMS micromirror with a large-sized two-dimensional MEMS micromirror array can solvethe application limitation of the MEMS micromirrors in a large-size spot laser radar, thus being conductive to implementation of long-distance detection of the laser radar.
Owner:SHENZHEN KYLE OPTICS TECH CO LTD
Weak target detection method based on automobile millimeter wave radar, tracking method and system
ActiveCN110646773AReduce the numberRealize long-distance detectionWave based measurement systemsInternal combustion piston enginesDistance detectionNoise
The invention discloses a weak target detection method based on automobile millimeter wave radar, a tracking method and a system. The weak target detection method based on automobile millimeter wave radar comprises the following steps of estimating the corresponding target angle of an echo signal in each period according to a corrected linear frequency modulation continuous wave signal in each period and the corresponding echo signal in each period; comparing whether the target angles of the echo signal in a plurality of coherent processing periods are consistent or not; if the target angles of the echo signal in the plurality of coherent processing periods are consistent, judging that a target to be resolved corresponding to the echo signal is a real target; and if the target angles of the echo signal in the plurality of coherent processing periods are not consistent, judging that the target to be resolved corresponding to the echo signal is a false target. Compared with the prior art, the weak target detection method based on automobile millimeter wave radar belongs to a low-signal-to-noise ratio target detection technology with the advantages that the goal of detecting a weak target in a long distance can be achieved; meanwhile, the number of false targets is greatly reduced; and the low-false-alarm-probability constraint is finally realized.
Owner:成都纳雷科技有限公司
Aircraft cable structure integrity online detection method based on ultrasonic guided wave
InactiveCN109298072ARealize long-distance detectionContinuous online detectionAnalysing solids using sonic/ultrasonic/infrasonic wavesProcessing detected response signalInsulation layerSonification
The invention provides an aircraft cable structural integrity online detection method based on ultrasonic guided wave, which comprises the following steps of: The ultrasonic guided wave signal generation module sends a pulse signal; the pulse signal is amplified through a signal amplification module; the amplified pulse signal activates the detection module and the ultrasonic guided wave to be generated by the detection module; a reflection signal is generated when an acoustic wave propagating along an aircraft cable encounters a cable insulation layer defect, the reflection signal causes theMFC sensor to vibrate, deform, and change the amount of charge; a charge amplifier converts the charge signal to a voltage signal and enters the computer for analysis through a multifunctional data acquisition card. Through acquiring the reflection signal, the defect is positioned according to the reflection signal and the emission signal time difference, so that realizing the real-time detectionof the aircraft cable. The aircraft cable structural integrity online detection method based on ultrasonic guided wave has the advantages that the condition of the cable insulation layer can be detected under the condition of operation of the cable, the operation is simple, the positioning precision is high, and electromagnetic field interference is not affected.
Owner:TIANJIN UNIV OF SCI & TECH
Target object positioning method and device, robot and storage medium
PendingCN111551171ALong-distance detection position coordinatesRealize long-distance detectionAngle measurementNavigation instrumentsDistance detectionEngineering
The embodiment of the invention provides a target object positioning method and device, a robot and a storage medium. The method comprises the steps: obtaining coordinate information of the robot under a geocentric geodetic coordinate system, the distance between a target object and the robot and the azimuth angle and the pitch angle of the target object relative to the robot; secondly, accordingto the distance between the target object and the robot and the azimuth angle and the pitch angle of the target object relative to the robot, determining first coordinate information of the target object under a station center horizon rectangular coordinate system; then, converting the first coordinate information into second coordinate information under a geocentric geodetic coordinate system according to the coordinate information of the robot and a conversion relationship between a station center horizon rectangular coordinate system and the geocentric geodetic coordinate system; visibly, the robot provided by the embodiment of the invention realizes long-distance detection of the position coordinates of the target object.
Owner:JD DIGITS HAIYI INFORMATION TECHNOLOGY CO LTD
Depth information processing method and system and electronic equipment
ActiveCN111458692ARealize long-distance detectionWave based measurement systemsInformation processingAlgorithm
The invention discloses a depth information processing method and system and electronic equipment. The depth information processing method comprises the steps that multiple pieces of partition depth information are acquired, the multiple pieces of partition depth information are acquired by detecting multiple view field partitions through a partition TOF according to a certain time sequence, and the multiple view field partitions jointly form a complete target view field; and according to the partition arrangement of the plurality of view field partitions, the plurality of partition depth information in a splicing manner are processed to obtain complete depth information corresponding to the target view field.
Owner:SHANGHAI NORTH OCEAN TECH CO LTD
High-voltage transmission line construction distance early warning device and method
InactiveCN111207787AGuarantee normal constructionCompatible with the working environmentAlarmsAcoustic wave reradiationElectric field sensorSignal processing circuits
The invention discloses a high-voltage transmission line construction distance early warning device and method, and the device comprises a measurement end and an alarm end, and the circuit structuresof the measurement end and the alarm end are installed in a shell and are powered by a power module. The electric field sensor at the measurement end is connected with the input end of a controller through a signal processing circuit, a distance measuring sensor is connected with the input end of the controller, and the controller is connected with a wireless transmission module; an alarm end wireless data transmission module is connected with the controller, a working mode setting key is installed on the machine shell and connected into the controller through a working mode setting module, the output end of the controller is connected with a voice control module and a light control module, the voice control module is connected with an alarm and a buzzer, and the light control module is connected with a light emitting diode. The measurement equipment and the alarm equipment which are of a split structure are arranged, the measurement equipment can be arranged at the top end of the construction equipment, the operator holds the alarm equipment by hand, long-distance detection and alarm are achieved and the working environment of large mechanical equipment is met.
Owner:STATE GRID HENAN ELECTRIC POWER COMPANY ZHENGZHOU POWER SUPPLY +2
A long-distance human body hidden dangerous goods detector based on radar target polarization characteristics
ActiveCN105866850BFilter out noiseRealize long-distance detectionOptical detectionDetection using electromagnetic wavesHuman bodyFar distance
Owner:INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
Automatic collimation optical remote measurement system
InactiveCN107167812ASimple collimation structureImprove stabilityElectromagnetic wave reradiationCollection systemAutocollimation
The invention belongs to the technical field of optical telemetry, and in particular relates to an optical telemetry system, which includes a collimator lens and an echo collection system located in front of the measuring laser. A beam splitter is set in front of the zoom lens in the coaxial direction, an aiming laser is set under the beam splitter, a reference gas chamber and a reference detector are set above the beam splitter, a part of the visible laser emitted by the aiming laser is transmitted through the beam splitter and enters the reference The gas chamber and the reference detector, part of the visible laser light emitted by the aiming laser is reflected by the beam splitter and coincides with the measurement laser of the measuring laser passing through the beam splitter, and the output window is located in front of the beam splitter.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Electronic tag capable of being detected at long distance
InactiveCN103577870AAchieve swapRealize long-distance detectionRecord carriers used with machinesElectronic identificationAdhesive
The invention belongs to the technical field of electronic tags, and particularly relates to an electronic tag capable of being detected at a long distance. A microchip and a directive antenna are arranged in the tag and the microchip is connected with the directive antenna. Paper packaging is adopted by the appearance of the tag. A breakage resistant line is arranged on the appearance of the tag. The surface of the tag is coated with an easy-to-stick adhesive. A fixed identification code is arranged in the microchip of the inner portion of the tag. The electronic tag capable of being detected at the long distance is high in sensitivity, strong in directivity, the unique identification code is fixed inside the electronic tag, the service life is long, and use is convenient.
Owner:SHAANXI HAOHAN DIGITAL TECH
State monitoring method and system for power cable terminal equipment based on infrared thermogram
ActiveCN113433167AImprove detection accuracyAccurate discriminationOptically investigating flaws/contaminationMaterial flaws investigationDistance detectionEngineering
The invention discloses a state monitoring method and system for power cable terminal equipment based on an infrared thermogram. The method comprises the steps of segmenting a foreground region and a background region of target power cable terminal equipment for a to-be-processed infrared thermogram i; calculating a temperature average value Ta of the background region, dividing the foreground region into foreground sub-regions, and calculating a temperature average value TN in the foreground sub-regions; and judging whether the target power cable terminal equipment has a fault or not according to the temperature difference between the temperature average value TN in the foreground sub-region of any m-th row and n-th column and the temperature average value Ta in the background region. Infrared temperature measurement is an effective means for discovering the overheating defect of the cable terminal, various cable terminal defects are analyzed through background temperature differences, the monitoring efficiency can be effectively improved, the working temperature state of the target power cable terminal equipment can be accurately and timely judged, and method has the advantages of high detection accuracy, capability of realizing remote detection, safety and reliability.
Owner:STATE GRID HUNAN ELECTRIC POWER +2
Vehicle-mounted radar detection system for long-distance detection and method thereof
PendingCN110398737AIncrease the working distanceRealize long-distance detectionRadio wave reradiation/reflectionFrequency conversionDistance detection
The present invention relates to the technical field of vehicle-mounted radar, and particularly relates to a vehicle-mounted radar detection system for long-distance detection and a method thereof. The system comprises a radar component and a frequency conversion component separately installed on a to-be-detected vehicle and a target vehicle. A frequency of a transmitting radio wave and a frequency of a receiving radio wave of the radar component are separately a transmitting frequency and a receiving frequency. The frequency conversion component performs amplification and frequency conversionprocessing on a radio wave of a received transmitting frequency, and sending a radio wave with a frequency-converted receiving frequency. An objective of the present invention is to provide a vehicle-mounted radar detection system and a method thereof. Technical solutions of the present invention can be used to stabilize an echo power received by vehicle-mounted radar in a stable power range, sothat a radar receiver can work in a relatively stable working status, thereby implementing long-distance detection of the vehicle-mounted radar.
Owner:HUIZHOU DESAY SV AUTOMOTIVE
Bi-conical tapered fiber evanescent wave coupling-based fiber Raman sensor detection device
InactiveCN101561396BIncrease penetration depthAvoid direct contactRaman scatteringCoupling light guidesPolarizerMonochrome
The invention relates to a bi-conical tapered fiber evanescent wave coupling-based fiber Raman sensor detection device, which comprises a monochromatic source and a high-sensitivity Raman spectrometer, wherein the monochromatic source sequentially passes through a polaroid sheet, a focusing lens, a fiber coupling platform and a fused biconical taper fiber to be connected to the high-sensitivity Raman spectrometer, and the fused biconical taper fiber is placed in a solution to be detected; and in a taper zone of the fused biconical taper fiber, evanescent waves excite the molecules, absorbed bya metal nanoparticle layer on the surface of the fiber, of the solution to be detected to enable the molecules of the solution to be detected to generate a Raman spectrum which is coupled back to thefiber through the taper zone of the fiber and transmitted to the high-sensitivity Raman spectrometer to detect the Raman spectrum of the solution to be detected. The device is simple in structure, high in anti-interference capacity, high in flexibility and is suitable to be used on various occasions such as online analysis, real-time detection and biopsy specimen analysis.
Owner:SHANGHAI UNIV
Surface-enhanced raman scattering sensor detector based on optical fiber fuse-tapered coupler
ActiveCN101666750BIncrease penetration depthAvoid interferenceRaman scatteringCoupling light guidesOptical fiber couplerOptical fiber cable
The present invention relates to a surface-enhanced raman scattering torquemaster based on an optical fiber fuse-tapered coupler, comprising two monochromatic light sources, a 2*2 fuse-tapered optical fiber coupler and two high-sensitivity raman spectrometers. The two monochromatic light sources are connected to the two high-sensitivity raman spectrometers sequentially through two polaroid sheets, two focusing lens, two optical fiber coupling platforms and the 2*2 fuse-tapered optical fiber coupler; the 2*2 fuse-tapered optical fiber coupler is positioned in the solution or the gas to be tested; on the fused tapering zone part of the 2*2 fuse-tapered optical fiber coupler, evanescent wave excites the solution or gas molecule to be tested which is absorbed by a optical fiber surface metal nanometer particles layer, so as to generate raman spectrum, couple into the optical fiber through the optical fiber fused tapering zone, and transmit to the high-sensitivity raman spectrometers, to detect the raman spectrum of the solution or the gas molecule to be tested. The device has simple structure, strong anti-interference capacity and high sensitivity, and is applicable to various fields such as on-line analysis, real-time detection, biopsy sample analysis and the like.
Owner:SHANGHAI UNIV
Flight detecting device, imaging system and radiation detecting method thereof
InactiveCN109490941AImprove accuracyImprove the detection effectX/gamma/cosmic radiation measurmentElectric signalImage system
The invention discloses a flight detecting device, an imaging system and a radiation detecting method thereof. The flight detecting device comprises a plurality of communicated aircrafts. Each aircraft comprises a detecting module, a flight transmission module and an overhead control module, wherein the detecting module is configured to perform detection according to an obtained detection indication instruction, and comprises a scintillating crystal for receiving radioactive rays transmitted by a target object and generating corresponding optical signals and a photoelectric converter for converting the optical signals into electric signals; the flight transmission module is configured to bear the detecting module and perform flying according to an obtained flight indication instruction; the overhead control module is configured to control operation of the detecting module and the flight transmission module according to an obtained task instruction and send detecting data to a ground monitoring device according to feedback information sent by the detecting module and / or the flight transmission module so as to determine the position of the target object. By means of the technical scheme, the purpose of remotely detecting the target object can be achieved.
Owner:RAYCAN TECH CO LTD SU ZHOU
Magnetic pointer type non-contact temperature, pressure, liquid level measuring transmitter for opening-free nuclear vessel
InactiveCN104792359AChange lengthAddressing the impact of precise interpolation positioningMeasurement devicesInternal pressureVessel sealing
The invention relates to the technical field of intelligent control and intelligent detecting, in particular to a magnetic pointer type non-contact temperature, pressure, liquid level measuring transmitter for an opening-free nuclear vessel. The measuring transmitter comprises a nuclear vessel sealing shell, a vessel inner temperature parameter measuring and converting unit, a vessel inner pressure parameter measuring and converting unit, a vessel inner liquid level parameter measuring and converting unit and a magnetic pointer measuring transmitting unit, wherein the vessel inner temperature parameter measuring and converting unit and the vessel inner pressure parameter measuring and converting unit are located above the nuclear vessel sealing shell, the vessel inner liquid level parameter measuring and converting unit is located on one side of the nuclear vessel sealing shell, and the temperature, pressure, and liquid level parameters can be measured at the same time. The magnetic pointer type non-contact temperature, pressure, liquid level measuring transmitter has the advantages that the influence of the zero voltage shifting of linear Hall sensors on precise interpolation positioning is solved through environment temperature compensation, and the problems that precision is lowered and measuring cannot be performed due to the fact that an external magnetic pointer measuring transmitting unit is far away from the vessel inner measuring and converting units and the magnetic field signals of a magnetic pointer are weak are solved.
Owner:DALIAN UNIV OF TECH
A kind of all-fiber laser radar with multi-shot and single-receive telescope array
ActiveCN106646426BImprove time resolutionImprove spatial resolutionWave based measurement systemsOptoelectronicsSignal light
The embodiment of the invention discloses an all-fiber laser radar for a multi-transmitting single-receiving telescope array, and the radar comprises a light source module, a light-splitting module, a transmitting and receiving telescope module, and a collection module. A laser beam is divided into two beams, wherein one beam serves a reference calibration beam, and the other beam serves as signal light interacting with the atmosphere. The signal light is transmitted to a telescope array for transmitting, and a telescope receives an atmosphere echo single after the signal light interacts with the atmosphere. Moreover, the radar carries out the collection of the atmosphere echo signal and the reference calibration beam. According to the technical scheme of the invention, the radar is stable in system, is compact in structure, employs all-fiber connection, employs the laser telescope array, improves the laser emission power and the detection SNR, achieves the far detection, improves the time resolution, spatial resolution of a laser radar, and improves the detection precision of the laser radar.
Owner:UNIV OF SCI & TECH OF CHINA
Bridge suspender damage and wire breakage detection device based on magnetostriction method
PendingCN111103348ACompact structureEasy to assembleMaterial magnetic variablesClassical mechanicsReceiver coil
The invention discloses a bridge suspender damage and wire breakage detection device based on a magnetostriction method, and the device comprises: a coil assembly mechanism which comprises more than two arc-shaped substrates, wherein all arc-shaped substrates surround the outer side of a suspender to form a fixed substrate structure; a coil unit which comprises an exciting coil and a receiving coil, wherein the exciting coil and the receiving coil are wound on the outer side of the base body structure; a magnetic circuit permanent magnet structure which comprises a yoke, wherein more than onegroup of permanent magnet units are arranged on the yoke, each group of permanent magnet units comprises a saddle piece, a permanent magnet and a clamping piece, and the permanent magnet is connectedwith the yoke and used for generating a uniform magnetic field, the saddle piece is used for connecting the permanent magnet and the clamping piece, and the clamping piece is used for being connectedwith a coil assembling mechanism to form a clamping type fixing structure. The bridge suspender damage and wire breakage detection device has the advantages of the simple and compact structure, simpleand convenient assembly, the wide application range and the like.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
Optical fiber type laser liquid turbidity measuring device and measuring method
InactiveCN102914519BImprove stabilityEffective isolationScattering properties measurementsPhotovoltaic detectorsMeasuring principle
The invention relates to an optical fiber type laser liquid turbidity measuring device and measuring method. The measuring device comprises a laser, an optical fiber, an optical fiber circulator, an optical fiber collimator, a photoelectric detector and a signal demodulating and processing system. In a measuring system, a full-optical fiber structure of the optical fiber circulator and the optical fiber collimator is adopted, and on the basis of a back scattering light measuring principle, namely, a monotonous relation between the liquid turbidity and the increasing of the scattering light intensity, the accurate on-line measurement for the liquid turbidity under the conditions of long distance and narrow space and other complex conditions is realized. The optical fiber type laser liquid turbidity measuring device has a simple structure, is easy to realize and is high in stability and sensitivity; the practicability and safety of a liquid turbidity measuring system are effectively increased; and a technical support is supplied to the long-term on-line water quality monitoring.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI +1
Preparation method of surface-enhanced Raman scattering optical fiber probe
InactiveCN112730381AEasy to operateThe preparation process is simple and controllableRaman scatteringNanoparticleOptical fiber probe
The invention discloses a preparation method of a surface-enhanced Raman scattering optical fiber probe. The preparation method comprises the following steps of preparing a gold seed solution and a potassium carbonate stock solution, preparing an optical fiber probe, carrying out silylation treatment on the surface of the obtained optical fiber probe to obtain a silylated optical fiber probe, putting the obtained silylated optical fiber probe into a gold seed solution, putting into a refrigerator for incubation, and then washing with deionized water to remove free gold nanoparticles on the surface of the optical fiber, so as to obtain an incubated optical fiber probe, and putting the incubated optical fiber probe into a potassium carbonate stock solution, adding a reducing agent, carrying out further in-situ growth on the gold nanoparticles modified on the end surface of the optical fiber to enable the gold nanoparticles to epitaxially grow, and washing the grown optical fiber probe with deionized water to obtain the surface-enhanced Raman scattering optical fiber probe. The method is simple to operate, low in cost and controllable in process; the prepared optical fiber probe is high in detection sensitivity, stable in signal, rich in hot spots and capable of detecting low-concentration residual substances.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Gap detection tool special for airplanes and using method
The invention relates to the technical field of gap detection on aircrafts, in particular to a gap detection tool special for airplanes and a using method. The gap detection tool comprises a handle and a detection elbow, the handle is detachably connected with the detection elbow, the detection elbow extends into a gap, and if the detection elbow cannot smoothly extend into the gap, is it indicated that the gap width is unqualified; and if the detection probe can smoothly enter the gap, the detection elbow moves along the gap extension direction, and if the detection elbow moves smoothly, it is indicated that the gap is qualified, and otherwise, it is indicated that the gap is unqualified. According to the technical scheme, the gap detection tool special for the airplane is provided for gap detection in all areas of the airplane, the structure is simple, the cost is low, the narrow and complex space gap detection which cannot be achieved through detection means, such as optics, calipers, etc., can be achieved, and the technical scheme is convenient and fast to implement. The rapid detection of gaps can be realized after airplane conduits and cables are installed, the reliability ofdetection results can be ensured, and meanwhile, the high detection efficiency is achieved.
Owner:CHENGDU AIRCRAFT INDUSTRY GROUP
Large-angle transmitting-receiving synchronous laser radar optical system
PendingCN114415149AImprove performanceRaise the scan resonant frequencyElectromagnetic wave reradiationPhotovoltaic detectorsDistance detection
The invention belongs to the field of laser radar optical systems, and relates to a large-angle transceiving synchronous laser radar optical system. The problem that an existing MEMS laser radar cannot be compatible with large detection view field, high detection frame rate and long-distance detection is solved. A laser emission chip and a photoelectric detector response chip are implanted into the surface of an MEMS scanning galvanometer type scanning element. While the MEMS scanning galvanometer is controlled to vibrate, the laser emission chip is controlled to emit laser and the photoelectric detector response chip is controlled to receive the response of a signal, and the laser emission light source does not need to be reflected by the surface of the MEMS scanning galvanometer, namely, the MEMS scanning galvanometer does not play a role of a scanning reflector any more. The laser emission chip can directly follow the MEMS scanning galvanometer to scan and emit light, and meanwhile, an angle-expanding optical system is arranged outside or field splicing is carried out to shape small-angle scanning into wide-angle scanning emission, so that the restriction of the area size of the MEMS scanning galvanometer on the scanning resonant frequency and the scanning angle is weakened.
Owner:XI AN ZHISENSOR TECH CO LTD
A working method of a frequency-encoded fiber optic time-domain reflectometer
ActiveCN104344945BModulation duration is shortImprove detection distanceTesting optical propertiesTime-domain reflectometerData acquisition
Owner:宁波联河光子技术有限公司
Magnetic pointer type non-contact temperature, pressure, liquid level measurement transmitter for non-open nuclear container
InactiveCN104792359BChange lengthAddressing the impact of precise interpolation positioningMeasurement devicesInternal pressureVessel sealing
The invention relates to the technical field of intelligent control and intelligent detecting, in particular to a magnetic pointer type non-contact temperature, pressure, liquid level measuring transmitter for an opening-free nuclear vessel. The measuring transmitter comprises a nuclear vessel sealing shell, a vessel inner temperature parameter measuring and converting unit, a vessel inner pressure parameter measuring and converting unit, a vessel inner liquid level parameter measuring and converting unit and a magnetic pointer measuring transmitting unit, wherein the vessel inner temperature parameter measuring and converting unit and the vessel inner pressure parameter measuring and converting unit are located above the nuclear vessel sealing shell, the vessel inner liquid level parameter measuring and converting unit is located on one side of the nuclear vessel sealing shell, and the temperature, pressure, and liquid level parameters can be measured at the same time. The magnetic pointer type non-contact temperature, pressure, liquid level measuring transmitter has the advantages that the influence of the zero voltage shifting of linear Hall sensors on precise interpolation positioning is solved through environment temperature compensation, and the problems that precision is lowered and measuring cannot be performed due to the fact that an external magnetic pointer measuring transmitting unit is far away from the vessel inner measuring and converting units and the magnetic field signals of a magnetic pointer are weak are solved.
Owner:DALIAN UNIV OF TECH
A Remote Sensing System for Radial Plume Multi-component Gas Measurement
ActiveCN111122499BReal-time measurement of concentration informationAchieve compactColor/spectral properties measurementsBeam splitterGrating
The invention relates to a radial plume multi-component gas measurement remote sensing system, which belongs to the field of laser remote sensing measurement, and includes a reflected laser acquisition unit and a data acquisition unit; the data acquisition unit includes a data acquisition card and a computer, and the reflected laser acquisition unit includes multiple Laser, the light of each laser is divided into two paths through the beam splitter, one path is irradiated to the first detector through the reference absorption pool, and the other path is irradiated to the beam expander through the beam combiner, and the cooperative target reflectors are arranged in sequence along the optical path Mirror, reflector, first lens, and converge to the grating, where the separation of different wavelengths is realized, and the light of different wavelengths is incident on the second detector connected to the data acquisition card through the narrow-band filter and the second lens, and the laser The number is more than two, and the laser is a modulated semiconductor laser, the scanning frequency is greater than 100Hz, and the modulation frequency is greater than 20kHz. The invention has simple and compact structure and high sensitivity, and can detect the concentrations of various gases in the air in real time.
Owner:山东铂锐激光科技有限公司
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