176results about How to "Improve detection depth" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The invention discloses a towed underwater geological electrical method detection system and a method. The system includes: an underwater electrical cable, simple underwater electrodes, water pressuremeasurement and sensing units, an electrical cable floating and sinking unit, an underwater GPS positioning system, an inflator, an electrical method data collection and storage module and a data processing module. The underwater electrical cable is fixed with the electrical cable floating and sinking unit. The electrical cable floating and sinking unit is connected with the inflator. The underwater electrical cable is connected with the electrical method data collection and storage module and the data processing module in turn. The simple underwater electrodes and the water pressure measurement and sensing units are fixed on the underwater electrical cable. The underwater GPS positioning system includes responders, a shipboard transducer and a GPS. The responders are fixed at simple underwater electrodes of a front part, a middle part and a tail part on the underwater electrical cable. The responders are connected with the shipboard transducer in a wireless manner. The GPS is fixed on a tugboat. The towed underwater geoelectrical detection method and the method provided by the invention systematically solve the deficiencies and the problems still existing in current underwater geological electrical method detection, and have good application prospects.

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.

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.

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.

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.

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.