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176results about How to "Improve detection depth" patented technology
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Radio-frequency micro-capacitance fingerprint acquisition chip and method
ActiveCN103870817AImprove detection depthPrevent embeddingCharacter and pattern recognitionInput/output processes for data processingSequence signalCapacitance
The invention discloses a radio-frequency micro-capacitance fingerprint acquisition chip and method. The chip comprises a plurality of reference sensing units, a two-dimensional sensing unit array formed by the reference sensing units, an insulating layer, an insulating substrate serving as a finger contact surface, a radio-frequency signal generation circuit, a radio-frequency drive electrode, a sensing unit array controller used for providing bias-power-supply switching signals for switching on or switching off the sensing units and charge-discharge sequence signals needed by the sensing units, an analog-digital conversion array, a digital-analog converter for controlling the gain of the analog-digital conversion array, a sensing unit offset correction circuit, a fingerprint image cache, a fingerprint image output controller and an image signal processor. Due to the improvement of the structure of the sensing units and the additional arrangement of the sensing unit offset correction circuit, the radio-frequency micro-capacitance fingerprint acquisition chip can solve the problems of fingerprint residual, interference caused by other radiofrequency radiation, false fingers and small detection depth; besides, the chip can be embedded into a capacitive touch screen.
Owner:成都费恩格尔微电子技术有限公司 +1
Frequency domain ground-to-air electromagnetic prospecting method
ActiveCN104597506ASolve the problem of deep detectionLarge signal to noise ratioElectric/magnetic detectionAcoustic wave reradiationElectrical resistance and conductanceFrequency spectrum
The invention relates to a novel frequency domain ground-to-air electromagnetic prospecting method which adopts a work mode of land launching and air receiving of electromagnetic waves to extract signal frequency spectrums and gives the underground electrical structure an inverse interpretation through a whole-region apparent resistivity method. A launching system which works on the ground launches multi-frequency pseudo-random waves towards the underground through multiple cascades and the signal with multiple frequencies can be obtained with one triggering, thereby greatly improving the detection efficiency. A receiving system is loaded on an aircraft, so when measuring the magnetic fields in the testing zone, it can adapt to the environment of complex surface structures, reduce the static effect caused by the near field effect and expands the detection range of electromagnetic prospecting. The receiving system can correct and compensate tested magnetic-field components when measuring multiple magnetic-field components, so the resolution capability of magnetic field measurement is improved. The frequency domain ground-to-air electromagnetic prospecting method is applicable to depth detection of severe surface zones and has the advantages of being wide in detection range, large in detection depth, high in detection efficiency, etc.
Owner:JILIN UNIV
Intelligent detection and quantitative recognition method for defect of concrete
ActiveCN105929024AImprove effectivenessImprove detection depthAnalysing solids using sonic/ultrasonic/infrasonic wavesProcessing detected response signalLearning machineNon destructive
The invention discloses an intelligent detection and quantitative recognition method for the defect of concrete. According to the method, a concrete test piece is subjected to impact echo signal sample acquisition, signal noise reduction treatment and characteristic value extraction so as to construct a recognition model for analysis components including feature extraction, defect inspection, defect diagnosis and defect quantification and positioning; and the model is used for detecting and recognizing to-be-detected concrete. The intelligent detection and quantitative recognition method provided by the invention is directed at disadvantages of conventional detection technology for concrete defects and based on theoretical analysis, value simulation and model testing, employs advanced signal processing and artificial intelligence technology and fully digs out characteristic information of a testing signal, thereby establishing the model for intelligent rapid detection and classified recognition based on wavelet analysis and an extreme learning machine; and the model has good classified recognition performance, realizes intelligent rapid quantitative recognition and evaluation of the variety, properties and scope of the defect of concrete and further improves the innovation and application level of non-destructive testing technology for the defect of concrete.
Owner:ANHUI & HUAI RIVER WATER RESOURCES RES INST
Watch type non-invasive light sound blood sugar monitoring instrument
InactiveCN101301202ARealize real-time monitoringCompact structureDiagnostic recording/measuringSensorsBlood sugar monitoringNon invasive
The invention relates to a watch-type non-trauma optical acoustic blood sugar monitor. A display screen, a control button, a controller, a cell and a measurement box are arranged in watch-type casing, an acoustic insulating layer, a sound absorption pad, a semiconductor laser tube, a Fourier lens, a light-transparent protection film and a hollow multi-ring array sensor are packaged in the measurement box to form a integrated coaxial confocal structure. The watch-type casing is equipped with a watchband to be wore on wrist of detector, an optical acoustic excitation source and an optical path lens system generate focused laser beam which passes through the hollow multi-ring array sensor and radiates to blood vessel of wrist to realize optical acoustic blood sugar detection of continuous A-type dynamic focusing scan and provide optical acoustic blood sugar results of multiple sites along wrist depth direction. The monitor has advantages of having small structure and simple operation, realizing real-time monitoring of optical acoustic blood sugar, having no trauma when detecting, having no need of blood supply and test paper, and avoiding cross infection and environmental influence.
Owner:JIANGXI SCI & TECH NORMAL UNIV
Frequency domain photics coherent chromatography imaging method and system with large detecting depth
ActiveCN101214145AImprove detection depthImprove signal-to-noise ratioPhase-affecting property measurementsDiagnostic recording/measuringFrequency domain optical coherence tomographySignal-to-quantization-noise ratio
A frequency domain optical coherent tomography method with large detection depth and a system are provided. The system adopts a folding spectrum detection method to realize the spectrum detection of broadband with high resolution. The thought is that a broadband spectrum with the bandwidth of Delta Lambada is folded into a plurality of narrow wavelength windows of Delta Lambada 1, Delta Lambada 2-, delta Lambada n. High resolution detection is realized on every spectrum band. Then, all spectrum bands are synthesized into a broadband through splicing. The folding of the spectrum bands is realized through a combined diffraction grating. A rotating sub-grating regulates the incident angle im of the incident light to every grating, which leads to that the diffraction light direction of the relative wavelength window Delta Lambada m of every sub-grating is distributed within the same range. Then, the diffraction lights of all spectrum bands are focused on the detection surface of a spectrum detection array through a toroidal focusing mirror. Through the spectrum folding, the invention increases the effective detection pixel number N of the spectrum detection and improves the detection depth of the optical coherent tomography system and the signal-noise ratio of chromatogram.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Cross-correlation-based nuclear magnetic resonance full wave signal noise filtering method
ActiveCN104898172AImprove detection depthSmall amount of calculationDetection using electron/nuclear magnetic resonanceFull waveRandom noise
The invention relates to a cross-correlation-based nuclear magnetic resonance full wave signal noise filtering method. Based on characteristics that noise is irrelevant to the sinusoidal signals of Larmor frequency but FID amplitude attenuation sinusoidal signals are relevant to the sinusoidal signals of Larmor frequency, the method comprises steps of filtering noise via cross-correlation operation, then fitting envelope of related wave forms, reconstituting correlation wave forms without noise and at last extracting FID signals in nuclear magnetic resonance full wave data by use of the deconvolution algorithm. According to the invention, calculated amount of operation data is small; power frequency, noise of harmonic waves, random noise and peak noise can be simultaneously suppressed; signal to noise ratio of the nuclear magnetic resonance full wave data is remarkably increased, thereby facilitating application range and detection depth of a nuclear magnetic resonance water explorer; additional reference noise eliminating devices are not required, so cost is reduced; and ideal filtering effects of the full wave data which are acquired at a time can be achieved via cross correlation, so measuring time is saved.
Owner:JILIN UNIV
Microwave phase-locked thermal imaging system and method
ActiveCN104713906AImprove signal-to-noise ratioImprove detection depthMaterial flaws investigationFast Fourier transformMicrowave
The invention discloses a microwave phase-locked thermal imaging system and method. The method comprises the following steps: periodically heating a detected object by adopting continuous microwaves subjected to amplitude modulation by a periodic phase-locked signal, generating thermal waves with periodic change inside the detected object, and recording a temperature signal with the periodic change on the surface of the detected object by adopting a thermal imager, wherein the temperature signal can reflect thermal wave abnormality caused by defects; setting a reference signal according to the phase-locked signal or a temperature signal without a defect area; performing fast Fourier transform on the temperature signal and the reference signal, and extracting the amplitude and the phase of specific frequency such as phase-locked frequency as characteristic values; performing phase-locked association on the temperature signal and the reference signal, and extracting the amplitude and the phase of the phase-locked frequency as characteristic values; and performing reconstruction imaging on the characteristic values of all pixel points of a detected area. The method and the system have the advantages of high signal to noise ratio, capacity of suppressing the emissivity change, large detection depth and the like and can be widely applied to the fields of nondestructive testing, medical imaging, target detection and the like.
Owner:WUXI DOUBLE HORSE DRILLING TOOLS
Fundus optical full-field microangiography imaging device and method
ActiveCN105769117ARestore clarityReal-time monitoringDianostics using fluorescence emissionSensorsOptical pathPhysics
The invention relates to a fundus optical full-field microangiography imaging device and method. The device comprises a fundus illumination optical path, a fundus imaging optical path, a synchronous triggering source and a data processing system, wherein the fundus illumination optical path and the fundus imaging optical path are synchronously triggered by the synchronous triggering source; the fundus illumination optical path comprises a light source controller, a laser light source, a beam expanding lens, a beam splitter lens and an eye piece objective lens which are sequentially connected; and the fundus imaging optical path comprises an eye piece objective lens, a beam splitter lens, an imaging ocular lens, a lens and a COMS (Complementary Metal Oxide Semiconductor) camera which are sequentially connected. The device and the method have the advantages that the light source gives out laser at the same frequency as the sampling frame rate of the camera; the realization of the fundus microvessel imaging is ensured; and meanwhile, the laser power is reduced, so that the value reaches the range capable of being borne by human eyes. The method and the device can realize the fundus optical full-field microangiography imaging. The method has the advantages that a contrast agent is not needed; the resolution ratio, the signal-to-noise ratio and the detection depth are high; and the fundus blood capillary can be rebuilt.
Owner:佛山市灵觉科技有限公司
Two-photon fluorescence biological silk material and preparation method thereof
InactiveCN102080271AGood Gemini FluorescenceImprove mechanical propertiesMonocomponent fibroin artificial filamentArtifical filament manufactureBiocompatibility TestingProtein materials
The invention relates to a two-photon fluorescence biological silk material and a preparation method thereof. The material is formed by evenly compounding two-photon inorganic fluorescent substances and biological silk protein materials at a mass ratio of (0.001-50):100. The excitation wavelength of the material is positioned near infrared, and the fluorescence wavelength is shorter than the excitation wavelength. The preparation method comprises the following steps: adding a fibroin solution into a solution containing the two-photon inorganic fluorescent substances; stirring to obtain a mixed solution; and drying, standing or spinning to obtain the two-photon fluorescence biological silk material. Alternatively, the preparation method comprises the following steps: at room temperature, adding pre-processed silk into a fibroin solution containing the two-photon inorganic fluorescent substances, and dipping;, and stirring, washing and drying to obtain the two-photon fluorescence biological silk material. The material provided by the invention has strong two-photon adsorption and adjustable two-photon fluorescence performance under the irradiation of near infrared laser; the wavelength of an excitation light source is bio-optically transparent and does not damage biological tissues; and the material has the advantages of good biocompatibility, strong mechanical property and good economic benefit, is easy to prepare and is suitable for industrial production.
Owner:DONGHUA UNIV
Comprehensive prospecting method for multi-metal minerals
InactiveCN110824582AGreat Prospecting BreakthroughLarge detection depthGeomodellingGeological measurementsMetallogenyGold ore
The invention discloses a comprehensive prospecting method for multi-metal minerals, and provides a prospecting method integrated with a mineralization system, water system sediment measurement, rockdebris measurement, large-scale geophysical and chemical prospecting profile / high-precision magnetic survey and engineering verification, and a huge prospecting breakthrough is obtained in the prospecting process. Through the implementation of the combination method, the limitation of shallow coverage conditions on conventional geological mapping can be effectively avoided, a prospecting target area can be rapidly shrunk in a quaternary coverage area, and spatial positioning of a mineralization alteration zone and an ore-bearing geologic body is achieved, so that the prospecting success rate is increased accordingly, and the method has the advantages of being short in prospecting period, high in efficiency and low in prospecting cost and is suitable for prospecting of shallow vein-shaped copper-lead-zinc-silver-gold ores and skarn-type iron-copper ores; and the wide-area electromagnetic method has the absolute advantage of large detection depth, and is suitable for exploration of deepconcealed porphyry type copper-molybdenum ores by combining an ore prospecting prediction geological model established according to geological characteristics and a speculated concealed ore-bearing porphyry body range.
Owner:马忠元
Fiber-Raman-enhanced probe based on tapered optical fiber and micro-ball lens and manufacturing method of fiber-Raman-enhanced probe
InactiveCN106124478AImprove spatial resolutionImprove detection depthRaman scatteringFiberSignal-to-noise ratio (imaging)
The invention discloses a fiber-Raman-enhanced probe based on a tapered optical fiber and a micro-ball lens and a manufacturing method of the fiber-Raman-enhanced probe. The fiber-Raman-enhanced probe comprises the optical fiber with a tapered end, a micrometer-scale ball and glue connecting the tip of the tapered optical fiber and the ball. Single-color laser enters the optical fiber from one end of the optical fiber in a coupling manner, reaches the tapered end of the optical fiber, and converges to the surface of a sample through the ball lens at the tip of the tapered optical fiber. The probe can focus detecting light into a thin and long light beam, the width of the focused light beam is the size of sub-wavelength, and the length of the focused light beam is about three times of the wavelength. When the probe is used as the Raman probe, the thin and long focused light beam can stimulate more to-be-detected molecules, and the sub-wavelength width can increase the spatial resolution of detecting. Meanwhile, due to the fact that the tapered optical fiber is coupled into the micro-ball and then focused to the sample, the irradiating area of excitation light is reduced, only a focus point has the enhanced excitation light, and the spatial resolution and signal-to-noise ratio of Raman detecting are increased favorably.
Owner:SOUTHEAST UNIV
Method for detecting stochastic resonance transient electromagnetic weak signals
InactiveCN101825665AEliminate frequency restrictionsImprove detection depthElectromagentic field characteristicsTime domainFrequency spectrum
The invention relates to a method for detecting stochastic resonance transient electromagnetic weak signals. Transient electromagnetic detecting receiving signals are ns (t), wherein ns (t) is equal to s (t) plus n (t), and s (t) is target signals. In the method, scale variation is carried out on the signals, i.e. the frequency domain of time-domain signals ns (t) is NS (jw), and the frequency domain of ns (mt) is shown in the specification, wherein m is a nonzero constant. The time-domain signals are compressed by m times, and the frequency spectrum thereof in the frequency domain is expanded by m times. Thus, the frequency of large frequency weak target signals in the noise received by transient electromagnetic detection is reduced to be less than 0.1Hz, the weak target signals are input to a stochastic resonance system to generate resonance, then the target signals after time-domain compression are extracted, and then the frequency spectrum of the obtained target signals is reduced. The method of the invention comprises the following steps: firstly, inputting noise to the stochastic resonance system to obtain a noise average power spectrum strength Pn; then inputting the signals to the resonance system, wherein a frequency fi which meets the power spectrum strength in the power spectrum of output signals is the resonance frequency; and reducing each resonance frequency fi to obtain the actual frequency of the target signals. The method eliminates frequency restriction of the stochastic resonance system on transient electromagnetic signals to be detected, and accurately detects the weak target signals.
Owner:百色美联天衡地质探测雷达制造有限责任公司
Phase-shifting frequency modulation-based photo-thermal imaging method
InactiveCN103901073AHigh resolutionAvoid defectsMaterial flaws investigationImage detectionEngineering
The invention discloses a phase-shifting frequency modulation-based photo-thermal imaging method which comprises the following steps: S1, generating a phase encoding intrapulse linear frequency modulation signal by utilizing a function generator, performing analog modulation on a power amplifier of a halogen light source, and achieving regular change of light intensity output by the halogen light source according to the phase encoding intrapulse linear frequency modulation signal; S2, connecting a computer with a focal plane thermal infrared imager, and controlling the focal plane thermal infrared imager to acquire a thermal wave radar signal on the surface of a tested sample; and S3, processing the acquired image sequence, extracting time-frequency domain characteristic information of a phase-shifting frequency modulation thermal wave signal, and acquiring a characteristic information image to perform defect detection. A heating heat source is modulated by adopting the phase encoding intrapulse linear frequency modulation signal, the defects of thermal wave imaging detection by a phase locking technique are overcome, and the resolution and detection range of the defect depth are improved.
Owner:HARBIN INST OF TECH
Periodic-pulse thermal-imagery detection method for leaded steel material debonding defect
ActiveCN107490599AHigh-resolutionEasy to detectMaterial flaws investigationPulse thermographyImage resolution
The invention discloses a periodic pulse thermal imagery detection method for a leaded steel material debonding defect. A part to be tested is excited by periodic pulse to obtain a thermal-imagery sequence of the part to be tested, the thermal-imagery sequence contains defect information, a surface temperature of the thermal-imagery sequence changes along with time, then fourier expansion is performed on the thermal-imagery sequence to be changed into superposition of a plurality of sinusoidal signals, and thermal responses of all the corresponding sinusoidal signals can be obtained according to thermal wave principle; thus, a thermal response of the periodic pulse can be obtained, the purposes of increasing energy and controlling the maximum temperature to rise at the same time can be obtained, a detection depth is improved, a signal resolution ratio is increased, and a detachable rate of deep-layer defects and shallow-layer micro defects is improved.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Ultrasound emitting system for high frequency ultrasonic diagnostic equipment
InactiveCN101972154ASmall circuit sizeReduce usageBlood flow measurement devicesInfrasonic diagnosticsArray elementEngineering
The invention discloses an ultrasound emitting system for high frequency ultrasonic diagnostic equipment, and belongs to the technical field of medical ultrasonic diagnosis technology. The ultrasound emitting system comprises a high frequency array ultrasonic transducer, a high voltage matrix switching circuit, an emitting driving circuit and a field programmable gate array (FPGA) control circuit, wherein the high voltage matrix switching circuit connects array elements of the high frequency array ultrasonic transducer with various emitting channels of the emitting driving circuit, and performs circular switching according to the scanning sequence of ultrasonic beams during ultrasonic imaging; the emitting driving circuit generates high voltage pulses to act on the high frequency array ultrasonic transducer to generate ultrasound; and the FPGA control circuit controls the switching between the high frequency array ultrasonic transducer and the various emitting channels of the emitting driving circuit to generate trigger pulses of the emitting driving circuit. The circuit volume of the whole ultrasound emitting system is reduced, the number of used components is greatly decreased and the hardware cost is effectively controlled.
Owner:INST OF BIOMEDICAL ENG CHINESE ACAD OF MEDICAL SCI
Method for detecting integrity of rock mass of deep-buried tunnel
ActiveCN102495430AIntegrity factor is accurateHigh precisionElectric/magnetic detectionAcoustic wave reradiationElectrical resistance and conductanceElectromagnetic field
The invention discloses a method for detecting the integrity of a rock mass of a deep-buried tunnel. The method comprises the following steps of: (1) obtaining a high-frequency magneto-telluric field signal of an earth surface to be detected; (2) carrying out pre-processing on the high-frequency magneto-telluric field signal to obtain a high-frequency magneto-telluric resistivity curve; (3) revising the high-frequency magneto-telluric resistivity curve and obtaining a real resistivity of the rock mass according to the revised high-frequency magneto-telluric resistivity curve; and (4) calculating an integrity coefficient of the rock mass according to the real resistivity of the rock mass. The method for detecting the integrity of the rock mass of the deep-buried tunnel, disclosed by the invention, has the advantages of wide applicable range, high accuracy and high safety.
Owner:武汉铁四院工程咨询有限公司
Ultrasonic viscoelasticity measurement method and system
InactiveCN106037816AImprove detection depthOrgan movement/changes detectionInfrasonic diagnosticsElastographySonification
The invention provides a method and system for measuring ultrasonic viscoelasticity. The method includes: an arbitrary signal generator simultaneously generates an original tissue excitation signal and an ultrasonic transducer excitation signal; the original tissue excitation signal is amplified and then loaded on a micro-actuator , and apply the vibration of the specified waveform to the specified tissue through the vibrating rod, so that shear waves are generated in the tissue; the ultrasonic transducer excitation signal is sent by the ultrasonic receiving / transmitting system to drive the ultrasonic transducer, and the ultrasonic transducer emits The original echo signal obtained by the ultrasonic wave reflected and scattered by the tissue is received by the ultrasonic transducer, and transmitted to the acquisition card through the ultrasonic receiving / transmitting system; according to the pulse echo processing algorithm, and the echo signal, The propagation velocity of the shear wave in the tissue is obtained; according to the viscoelastic data model of the tissue and the propagation velocity of the shear wave in the tissue, the elastic data and viscous data of the tissue are obtained. The invention applies the coding detection technology to the ultrasonic transient elasticity imaging system to increase the detection depth.
Owner:SHENZHEN UNIV
Towed underwater geological electrical method detection system and method
PendingCN110703335APrecise control over overlapping measurement rangesHigh precisionWater resource assessmentSatellite radio beaconingGps positioning systemData acquisition
Owner:ANHUI UNIV OF SCI & TECH
Hole sealing agent for seismic exploration and method of manufacturing the same
InactiveCN101318802ASlow reaction speedIncrease coagulation strengthSeismic energy generationGanisterUltimate tensile strength
The invention belongs to the seismic exploration technical field, in particular relating to a hole sealing agent and a preparation method thereof. The seismic exploration hole sealing agent is characterized in that the agent is prepared by superburning calcium oxide, cement with a strength grade more than 32.5 and an inorganic material; the raw materials by weight percentage of the hole sealing agent are: 40 to 97 percent of the superburning calcium oxide, 2 to 40 percent of the cement with the strength grade more than 32.5, and 1 to 30 percent of the inorganic material which is ganister sand or heavy calcium powder. The hole sealing agent has the advantages of simple construction, low difficulty to master, good sealing effect, safe use and low cost, etc.
Owner:武汉山友爆破科技工程有限公司
Portable blood sugar detector based on multi-ring array light sound sensor and testing method
InactiveCN101301203AMonitor blood sugar levelsAvoid cross infectionDiagnostic recording/measuringSensorsOptical radiationUltrasonic sensor
The invention relates to a portable non-trauma blood sugar detector based on multi-ring array optical acoustic induction technology and a detection method. The detector includes an optical radiation unit A comprising a laser generator, optical fiber, a focusing lens and a drive circuit; a signal processing unit B comprising an impedance matching circuit, a signal amplifying circuit, a signal filtering circuit, an A / D converting circuit, a pulse signal source and a signal processor; a testing induction unit C comprising a hollow multi-ring array ultrasonic sensor and a testing groove; an input key, a display screen and a cell. The detection method includes coating ultrasonic coupling liquid on finger which is to be tested and putting the finger into the testing groove. Due to employing the multi-ring array optical acoustic induction technology of forward receiving mode, continuous A-type dynamic focusing scan can be carried out along depth direction to monitor blood sugar content of human body and synchronously blood sugar optical acoustic data of multiple sites along depth direction can be provided. The detector has advantages of having no trauma when detecting, having no need of blood supply, employing miniaturized semiconductor laser tube as light resource, and having lower cost.
Owner:JIANGXI SCI & TECH NORMAL UNIV
Circular dual-frequency excitation eddy current probe and method for detecting thick-wall deep crack defects
PendingCN108344798AAvoid Missing CasesOvercoming direction sensitivityMaterial magnetic variablesDual frequencyFixed frame
The invention belongs to the technical field of nondestructive testing, and relates to a circular dual-frequency excitation eddy current probe and a method for detecting thick-wall deep crack defects.The circular dual-frequency excitation eddy current probe comprises dual-frequency excitation probe assemblies, a detection probe assembly and a fixing frame; two sets of excitation probe assembliesare provided, and are distributed in bilateral symmetry with the detection probe assembly as a center; each excitation probe assembly consists of an excitation coil and a excitation coil mounting vertical column; the detection probe assembly consists of a detection coil and a detection coil mounting vertical column; the fixing frame consists of a vertical column fixing plate and a scanning component connecting component which are fixedly connected; the bottom end of the excitation coil mounting vertical column and the bottom end of the detection coil mounting vertical column are mounted on thevertical column fixing plate; the excitation coil is a circular eddy current coil and is excited by adopting a sinusoidal dual-frequency AC current. After adoption of the circular dual-frequency excitation eddy current probe, the penetration depth of an eddy current and the deep crack detecting ability of the probe can be improved, and the penetration depth of the circular dual-frequency excitation eddy current probe can reach about 21mm.
Owner:BEIFANG UNIV OF NATITIES
Single frequency modulation pulse signal source for while-drilling layer range radar of horizontal well
ActiveCN105353357AImprove detection resolutionImprove detection depthWave based measurement systemsImage resolutionRadar
The invention discloses a single frequency modulation pulse signal source for a while-drilling layer range radar of a horizontal well. The single frequency modulation pulse signal source comprises a continuous wave signal source and a pulse signal source, wherein the continuous wave signal source is used for generating continuous wave signals which are used as signals to be modulated; and the pulse signal source is used for generating pulse signals which are used as carrier wave signals for modulating the signals to be modulated. The single frequency modulation pulse signal source for a while-drilling layer range radar of a horizontal well not only can guarantee that the while-drilling layer range radar is higher in detection resolution, but also can guarantee that the emission signals can be emitted to the stratum, with high efficiency and high fidelity. Therefore, the single frequency modulation pulse signal source can effectively improve the detection depth of the while-drilling layer range radar.
Owner:BC P INC CHINA NAT PETROLEUM CORP +2
Scanning dark field laser speckle blood flow imaging method and device
ActiveCN105433906AImprove detection depthDiagnostic recording/measuringSensorsCMOSDirect illumination
The invention discloses a scanning dark field laser speckle blood flow imaging method and device. Biological tissue is illuminated by means of space localized linear or dotted laser beams, scanning is conducted along the surface of the tissue to be tested, and the whole area to be tested is traversed. During each time of scanning, a laser speckle image reflected by the whole area to be tested (containing the area directly illuminated by the laser beams and the surrounding area not directly illuminated) is acquired by an area array CCD or CMOS camera through an optical imaging system, the laser speckle contrast corresponding to each pixel is calculated, and then the laser speckle image is converted into a blood flow image. Pixel weighted averaging is conducted on the blood flow images obtained by scanning the illumination laser beams at different positions, so that the final two-dimensional blood flow distribution image of the biological tissue in the area to be tested is obtained. The method and device have the advantages that the contribution of diffusion photons subjected to multiple scattering in the tissue to imaging is expanded, and detection depth is improved compared with a traditional laser speckle blood flow imaging method adopting broad-beam laser illumination.
Owner:HUAZHONG UNIV OF SCI & TECH
Low-frequency electromagnetism-based defect detecting device
InactiveCN105353030AEasy to operateOvercoming the effects of the skin effectMaterial magnetic variablesAudio power amplifierHall element
A low-frequency electromagnetism-based defect detecting device is characterized by consisting of a signal generator (1), a power amplifier (2), a exciting coil (3), a Hall element (4), an oscilloscope (5) and a support (6); the signal generator (1) produces a low-frequency sinusoidal signal of 1 to 100Hz, the low-frequency sinusoidal signal is amplified by the power amplifier (2), then the signal passes through the exciting coil (3) placed on the support (6) to produce a magnetic field, a defect makes the magnetic field change, and the Hall element (4) can sense the change of the magnetic field and display the change through the oscilloscope (5). According to the defect detecting device provided by the invention, a low-frequency signal is taken as an excitation signal, so the detection depth is improved without permanent magnet excitation and coupling, the cost is relatively low and the defect detecting device can be applied to various practical engineering.
Owner:CHINA JILIANG UNIV
Electrical resistivity correcting method for mine transient electromagnetic method
ActiveCN107765319ASolve the problem of low resistivity distortionImprove detection depthElectric/magnetic detectionAcoustic wave reradiationMeasurement pointInstrument Data
The invention relates to an electrical resistivity correcting method for a mine transient electromagnetic method. The method includes 1, placing an emitting coil at a measurement point position, setting a transmit-receive distance as TR1, acquiring a primary field value as indicated in the description and a secondary field value containing mutual inductance electro-dynamic potential as indicated in the description through instrument data collection; 2, keeping the position of the emitting coil unchanged, increasing the transmit-receive distance to TR2, acquiring primary field value as indicated in the description and a secondary field value containing mutual inductance electro-dynamic potential as indicated in the description through instrument data collection; 3, putting collected data into a correction formula as indicated in the description for cancelling the mutual inductance electro-dynamic potential, and obtaining a ground secondary field signal V2; 4, performing whole-area apparent resistivity calculation and time depth conversion on the secondary field signal V2 subjected to mutual inductance electro-dynamic potential cancelling and obtaining an apparent resistivity-depth curve. According to the invention, electrical resistivity correction is performed by utilizing transmit-receive distance observation data of two different processes and mutual inductance signals are cancelled, the valid ground secondary field signal is extracted and a problem of electric resistivity distortion caused by using the mine transient electromagnetic method can be solved well. Since the detection depth is in direct proportion to and the electric resistivity, the detection depth of the mine transient electromagnetic method is improved.
Owner:CHINA UNIV OF MINING & TECH (BEIJING) +1
Laser ultrasonic full-focus imaging detection device and method based on high-speed galvanometer cooperation
ActiveCN111610254AAchieve high-resolution 3D imagingImprove stabilityAnalysing solids using sonic/ultrasonic/infrasonic wavesPhase-affecting property measurementsGalvanometerEngineering
The invention discloses a laser ultrasonic full-focus imaging detection device and method based on high-speed galvanometer cooperation. The detection device comprises a laser ultrasonic transmitting module for scanning a two-dimensional focal plane, and a laser ultrasonic receiving module matching the laser ultrasonic transmitting module; an industrial control module is connected with and cooperatively controls the laser ultrasonic transmitting module and the laser ultrasonic receiving module; the laser ultrasonic transmitting module is composed of a focusing galvanometer and a pulse laser; the laser ultrasonic receiving module is composed of a focusing galvanometer and a laser interferometer; and the industrial control module is composed of a control card 1 and a control card 2 which areused for cooperative control of double focusing galvanometers, control software matching the two control cards, an ultrasonic data acquisition card and full-focusing imaging software. According to theinvention, non-contact, high-efficiency and high-resolution ultrasonic three-dimensional full-focusing imaging of internal defects of industrial parts can be realized.
Owner:WUHAN UNIV
Zero-magnetic-flux shallow transient electromagnetic test coil and test method thereof
ActiveCN110187395AIncrease the areaIncrease the emission magnetic momentElectric/magnetic detectionAcoustic wave reradiationImage resolutionEngineering
The invention discloses a zero-magnetic-flux shallow transient electromagnetic test coil and a test method thereof. The test coil comprises a transmitting coil and a receiving coil, wherein the transmitting coil is embedded in the receiving coil and is arranged in a coplanar and coaxial manner; the receiving coil comprises an outer receiving coil and an inner receiving coil; the radius of the outer receiving coil is larger than that of the inner receiving coil; the radius of the inner receiving coil is equal to that of the transmitting coil; and meanwhile, the turns inside the transmitting coil and the receiving coil are connected with each other in series. By the test method provided by the invention, the primary fields in the inner receiving coil and the outer receiving coil are equal insize and opposite in direction, and mutually offset to enable the total magnetic flux in the receiving coil to be zero, so that the effective elimination of the primary fields is realized, a pure secondary field signal is obtained, the shallow detection blind area range is greatly reduced, and the transient electromagnetic shallow detection resolution is effectively improved.
Owner:ANHUI UNIV OF SCI & TECH
Ultrasonic detection device and method for PA-TOFD combined polyethylene pipeline hot-melt butt joint
ActiveCN108562647AOvercome the resultOvercoming data cannot be recordedAnalysing solids using sonic/ultrasonic/infrasonic wavesNon destructiveButt joint
The invention relates to a non-destructive testing technology of polyethylene pipeline hot-melt butt joint and aims to provide an ultrasonic detection device and method for PA-TOFD combined polyethylene pipeline hot-melt butt joint. The ultrasonic detection device comprises a circumferential scanning track which is arranged on a polyethylene pipeline; the circumferential scanning track is providedwith a circumferential scanning device; one end of the connecting rod is fixed on the top of the circumferential scanning device, and the other end of the connecting rod is respectively provided witha phased array probe and a single crystal straight probe through a probe holder; the two probes are positioned on two sides of the hot-melt butt joint of the polyethylene pipeline, and a gap is maintained between the end part of the probe and the polyethylene pipeline. The ultrasonic detector has two detection functions of ultrasonic phase control detection and TOFD detection, and the phased array probe is used as an acoustic wave transmitting probe for ultrasonic phased array detection and TOFD detection. And the two detection results are synchronously displayed in real time. The method overcomes the defects that the traditional pulse-type ultrasonic detection technology is not intuitive, the data cannot be recorded and stored, and the defects of precise positioning and quantification are difficult to be made.
Owner:ZHEJIANG UNIV
Method for comprehensively detecting defects of metal pipe in non-contact dual-source magnetic field
InactiveCN106970143AReduce missed detection rateReduce the missed detection rate and greatly reduce the detection costElectric/magnetic detectionAcoustic wave reradiationElectromagnetic responseContact mode
The invention relates to a method for comprehensively detecting defects of a metal pipe in a non-contact dual-source magnetic field. The method comprises the following steps: S1, determining a detection route for non-contact detection on the ground, and laying a series of detection points; S2, at each detection point, detecting electromagnetic response characteristics of the metal pipe in a natural magnetic field and an artificial magnetic field respectively; S3, drawing electromagnetic response characteristic curves of the metal pipe in the natural magnetic field and the artificial magnetic field respectively; S4, performing differential amplification on the electromagnetic response characteristic curve in the artificial dual magnetic field to obtain a gradient modulus abnormality distribution map; S5, according to the gradient modulus abnormality distribution map and the electromagnetic response characteristic curve in the natural magnetic field, determining a comprehensive index; S6, performing contrastive analysis on the electromagnetic response characteristic curves of the metal pipe in the natural magnetic field and the artificial dual magnetic field, and with the combination of the comprehensive index, determining positions and levels of the defects of the metal pipe. By the method, various drawbacks in the conventional method for detecting local defects of the metal pipe in a contact mode are overcome.
Owner:武汉地大华睿地学技术有限公司
Electrical impedance imaging method
InactiveCN102846318AEasy to identifyHigh imaging sensitivityDiagnostic recording/measuringSensorsElectrical resistance and conductanceElectrical impedance scanning
The invention discloses an electrical impedance imaging method, and belongs to the technical field of electrical impedance scanning and imaging. The method disclosed by the invention comprises: step 1, respectively arranging a first electrode device and a second electrode device contacting with the surface of an object to be imaged at the two opposite sides of the object to be imaged, and enabling the first electrode device and the second electrode device to apply a constant clamp force onto the object to be imaged; step 2, applying an input electric signal via the first electrode device, acquiring the output electric signal of the second electrode device, and obtaining the current distribution of the object to be imaged under the clamp force; step 3, changing the clamping forced applied on the object to be imaged by the first electrode device and the second electrode device, and repeating the step 2; and step 4, constructing the impedance image of the object to be imaged according to the current distribution difference value of the object to be imaged between two different clamp forces. Compared with the prior art, the method disclosed by the invention has the advantages of higher sensitivity, good electrode contact antifact inhibition effect, and low implementation cost.
Owner:SOUTHEAST UNIV
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