233results about How to "Reduce detection blind spots" patented technology

The invention discloses a navigation robot obstacle detection method and system. The system mainly comprises an ultrasonic detection module, an ultrasonic scanning module, an infrared detection compensation module and a robot core control module, wherein the ultrasonic detection module is mainly realized by amplifying a 40 kHz high-voltage driving signal and an ultrasonic receiving signal. The module is erected on a scanning steering engine to realize front non-dead-angle 180-degree scanning detection. By combining infrared range finding, the compensation of a navigation robot ultrasonic blind region is realized. A driving circuit is realized by establishing an H bridge with a field effect transistor. In a navigation robot, planar multi-point sensing is realized by using a pair of ultrasonic probes; the range finding range can reach 5.9 m at farthest; and a detection blind region is reduced to 2 cm. The system has the characteristics of low cost, small detection blind region, high anti-diffraction capacity, high real-time property and the like and has broad industrialization prospect. The method and the system can be used for the fields of micro robot navigation, environmental detection, intelligent vehicle active safety and the like.

The invention discloses a laser radar receiving system, which is characterized in that a cassegrain telescope, a subsequent receiving optical unit and a visual field angle adaptive adjusting program are arranged, wherein the focal plane of the cassegrain telescope is positioned between a primary mirror and a secondary mirror; the laser radar subsequent receiving optical unit is arranged in the cassegrain telescope; the aperture of a small-hole diaphragm can be controlled by the visual field angle adaptive adjusting program, so that adaptive adjustment of a visual field angle of the telescope is realized; an output lens seat with a diameter of 52 mm is designed on a supporting cross arm of the telescope; the central line of the lens seat is coaxial with the central axis of the telescope; and the included angle of the normal line of the lens seat and the central axis of the telescope is 45 degrees. The echo signal lights with different detection wavelengths are focused at the center of the small-hole diaphragm through the parabolic primary mirror and the double-curve secondary mirror, and the shaped quasi-parallel signal lights enter the subsequent detection system.

The invention relates to an island detection method of a photovoltaic grid-connected power generating system, which comprises the following steps of: detecting load power in a photovoltaic grid-connected power generating system; judging whether the load power is matched with the output power of a preset inverter or not, if so, selecting an active detection mode for carrying out island detection; and otherwise, selecting a passive detection mode for carrying out island detection. Correspondingly, the invention also relates to an island detection device and a photovoltaic grid-connected power generating system. By combining active island detection with passive island detection, the invention not only reduces a detecting blind area and effectively ensures island detection efficiency but alsoimproves electric energy quality.

The invention discloses a vehicle-mounted laser radar control method, a device and vehicle-mounted equipment. The method comprises the steps that sensing and control data of a vehicle and a laser radar are received; whether a critical detection blind zone exists in the laser radar is judged according to the sensing and control data; and when the critical detection blind zone exists, the laser radar is controlled to move toward an effective detection position specific to the critical detection dead zone. The movable vehicle-mounted laser radar is adopted, and the laser radar can be dynamically adjusted towards an object area according to requirement and conducts detection by dynamical adjusting and controlling means, so that the effective detection area of the laser radar is greatly improved.

This invention discloses a laser radar transmission total-focal length optical transceiver system. It is characterized by the optical emission module comprised by the concave mirror, and optical emission / receive lens, also by optical receive module comprised by optical emission / receive lens and mirrors with hole in the center. The central holed mirror is set up 45 degrees in the center of the tube. Receive and emitted mirrors are installed in front of the central holed mirror. The receive beam is redirected reflected of 90-degree beam to the detection systems.

The invention discloses a sweeping robot, which comprises a robot main body, a first laser device and a second laser device, a camera and a controller, wherein the first laser device and the second laser device are respectively arranged on the robot main body; the first laser device and the second laser device respectively transmit a first laser beam and a second laser beam; the first laser beam is transmitted forwards in a horizontal direction, and the second laser beam is obliquely transmitted forwards in a mode of being downward relative to the horizontal direction; light beams, which are respectively perpendicular to corresponding transmission directions, are respectively formed by the first laser beam and the second laser beam; the camera is arranged on the robot main body; the controller is arranged on the robot main body; the first laser device and the second laser device as well as the camera are respectively connected to the controller and work under the control of the controller; and the camera can be used for catching laser images of the first laser beam and the second laser beam and can be used for transmitting to the laser images to the controller for image analysis and ranging. According to the embodiment of the invention, the sweeping robot is more comprehensive in detection range of obstacles and higher in detection precision, and the sweeping robot is capable of effectively relieving collision of the sweeping robot.

The invention discloses an isolated island detecting device and a method based on load characteristic. The concept of load characteristic is applied to new energy resource isolated island detection so that the isolated island can be well detected and the isolated island detecting time can be reduced. The isolated island detecting device based on load characteristic comprises the following structures or units: a grid-connected bus side current and voltage collecting unit, a current and voltage regulation circuit, an algorithm control unit, a driving circuit and an inverting unit, wherein the grid-connected bus side current and voltage collecting unit collects the data of the grid-connected bus side current and voltage; the current and voltage regulation circuit can filtrate and amplify the voltage and current signal obtained by sampling; the algorithm control unit analyzes the sampled data, controls the conduction of the inverting system and the power network according to the power network state, and controls PWM (pulse width modulation) signal output by the algorithm; the driving circuit reinforces the driving capability of the PWM control signal; and the inverting unit can reversely converts the direct-current signal into the alternating-current signal by the PWM control signal.

The invention relates to an ultrasonic detection technique, in particular to an electromagnetic ultrasonic automatic flaw detection method for plates and a device thereof. In the invention, vertical incident waves are used for flaw detection and can detect plates with larger thickness. An electromagnetic ultrasonic flaw detection probe which is used by the invention uses a pulse electromagnet to provide a magnetic field, has the characteristic of short duration time of the magnetic field, and can efficiently detect ferromagnetic plates and nonferromagnetic plates. The invention combines the echo waves of a bottom surface and flaws, thereby reducing the detection blind area, and not only achieving higher sensitivity to the flaws but also accurately positioning the flaws. The invention uses the electromagnetic ultrasonic technique as a core and has no need of an acoustic coupling agent and no need of pretreatment on the surface of a test piece in the detection process, thus the invention can be used for on-line detection on plates in various severe environments (such as high temperature or high speed) and has stronger environmental suitability and higher detection efficiency.

Disclosed is a high sensitivity ultrasonic probe comprising a connecting head (1), a shell (2), a damping block (3), a cable line (4), a diode (5), an acoustic lens (6) and a cable line (7); the probe is characterized in that: the high sensitivity ultrasonic probe comprises two to twenty elements (8) that can transmit and receive supersonic waves; wherein: the connecting head (1) is fixedly connected with the shell (2), the damping block (3) is fixedly arranged inside the shell (2), the cable line (4) is connected with the diode (5) and disposed inside the shell (2), and the acoustic lens (6) is arranged under the elements (8) that can transmit and receive supersonic waves. The ultrasonic probe has the advantages of: high sensitivity in defect detection, high signal-noise ratio, strong resolving power to adjacent defects, small non-detection zone, being easy in accurate positioning to defects and accurate measurement of sizes of defects, and good directivity.

The invention provides a near-field strong interference source inhibition method in an underwater far-field target passive positioning process. The method comprises the following steps of: before sonar equipment detects a far-field target, utilizing a near-field sound figure scanning method to extract the number N and position information of interference sources in a near-field area of the sonar equipment; building a model in which a near-field strong interference source exists when an underwater far-field target is detected, and calculating to obtain steering vectors of position coordinates on which i interference source is located; determining forms of a wave beam null width weight and an azimuth spectrum; judging whether a signal received by a receptive array belongs to a wideband signal or not; dividing the received wideband signal into a plurality of narrow-band signals on a frequency domain; and finally, synthesizing outputs of all frequency bands to obtain an estimation result of the wideband signal. According to the near-field strong interference source inhibition method in the underwater far-field target passive positioning process, local interference is regarded as a near field, a wave beam directive null point focused to a point is formed aiming at the position coordinates on which the near field is located, the concrete forms of the wave beam null width weight and the azimuth spectrum are provided, dead zone influence brought by the prior wave beam null width method is overcome, and meanwhile, a true target is regarded as a far field to be measured.

The invention relates to a vehicle automatic driving method and apparatus, a computer device and a storage medium. The method comprises the steps of: determining a vehicle forwarding target area; sending a collection instruction to at least one unmanned aerial vehicle, wherein the collection instruction is used for indicating the unmanned aerial vehicle to collect the environmental information ofthe target area; receiving the environmental information sent by the at least one unmanned aerial vehicle; and determining a driving path of vehicle automatic driving according to the environmental information. Through the vehicle automatic driving method and apparatus provided by the embodiment of the invention, the environmental information is collected by the unmanned aerial vehicle, the detection area can be increased, the detection blind area can be reduced, more and richer environmental data are provided for a self-driving vehicle, so that the self-driving vehicle can perform perform more accurate path planning according to the collected environmental information, the safety of the self-driving vehicle is ensured, and the application range of the self-driving vehicle is expanded.

The invention discloses an islanding detecting method which comprises the following steps: acquiring a voltage waveform of a common coupling point and measuring a frequency value, calculating the average change rate in a certain period to obtain a judging signal, comparing the judging signal with the preset change rate threshold value, outputting a control signal, selecting an outputted reference signal of an inverter by the control signal, introducing reference current after phase deviation under the condition that islanding possibly exists by a frequency change rate detection method, realizing further detection according to a sliding mode frequency deviation method, otherwise, introducing non-deviation reference current, and achieving normal operation of the system. The islanding detecting method has the advantages of reducing detection blind zones and impact on the system power quality and increasing the detection speed.

The invention discloses an island detection method and device. According to the method, a real time voltage angle is obtained according to power grid three-phase voltage calculation, a synchronous voltage angle is further determined according to a phase-locked loop based on the real time voltage angle; under normal circumstances, the real time voltage angle is approximately equal to the synchronous voltage angle; when an island and phase jump of grid point voltage occur, the real time voltage angle also changes suddenly with the phenomenon to enable a phase jump value to exist between the real time voltage angle and the synchronous voltage angle; if the average value of the voltage phase jump value of the grid point is larger than a preset jump threshold value in one circulation period, then the occurrence of the island is determined. The island detection method and device are simple in control process and convenient to achieve; the island can be detected in the one circulation detection period after occurrence, and therefore the detection efficiency is high; disturbance quantity is not needed to be added into the output of an inverter, and the output electric energy quality of the inverter can not be influenced; determination is conducted according to the average value of the phase jump, all interference factors are excluded, and the detection precision is improved; detection dead zones are reduced.

The invention discloses an island detection method based on harmonic distortion rate and frequency. The method herein includes the following steps: based on historical data, determining the maximum value (H<1>) of the harmonic distortion rate when a distributive photovoltaic power generation system joints a power grid and the minimum value (H<2>) of the harmonic distortion rate when the distributive photovoltaic power generation system is an island, if (H<1> is greater than H<2>) or the values of H<1> and H<2> can not be determined, and after it is detected that the harmonic distortion rate suddenly increases and lasts for a while, starting the harmonic distortion rate criterion and frequency varying amount to determine an island state; if (H<1> is smaller than H<2>), directly starting the harmonic distortion rate criterion and frequency varying amount to determine an island state. According to the invention, the method herein does not add a disturbing signal to the distributive photovoltaic power generation system, does not affect the quality of the electric energy of the distributive photovoltaic power generation system, and does not cause damage; uses the harmonic distortion rate and frequency, has small detection blind areas, increases the reliability of system island detection; and avoid sudden disturbance in the power grid by using a certain time delay, and prevents temporary change to the detected electric quantity from causing wrong determination of island detection.

The invention provides a monitoring system for scouring state of offshore wind power piles, comprising a broadband high frequency sonar device, a positioning device, a multi-angle adjusting bracket and a main control computer; the broadband high frequency sonar device is used for transmitting broadband or single frequency spectrum sound signal to the seabed, and receiving and pre-processing echo signals of multiple independent channels; the positioning device is used for positioning each pile; the multi-angle adjusting bracket is used for adjusting the spatial position of a transducer and angles of transmitted beams to realize monitoring of several continuous points and angles of the seabed piles; the main control computer is used for sending a setting instruction and a working instructionto the broadband high frequency sonar device, receiving and processing echo data of the broadband high frequency sonar device, displaying and storing the echo data, performing signal analytic processing and fitting according to the echo data, obtaining a curve of water depth changing with time, playing the historical echo data back and determining the scouring corrosion situations of the offshorewind power piles. The invention belongs to the technical field of underwater pile monitoring of offshore wind power, the scouring situations of the piles can be monitored in real time and intuitively, and accurate maintenance information is provided.

The invention discloses a method for detecting electronic tags for an EAS. The method comprises the following steps: setting the electronic tags on commodities and installing detecting antennae of the EAS in a monitoring area which is formed at a passageway, wherein when a commodity with an undeactivated electronic tag passes through the monitoring area at the passageway, the EAS can detect the electronic tag through the detecting antenna and generate an alarm signal, the number of the detection antenna is at least one, and all the antennae work by turns to scan the respective monitoring area. The scanning process of each detecting antenna comprises the following steps: sending out an electromagnetic wave once; receiving the electromagnetic wave twice; calculating out the characteristic values of the two signals and comparing the characteristic values; judging whether the received signal has only one extreme value by a satisfying strip, wherein if the received signal has only one extreme value, the received signal is accounted as a suspected given signal; and performing a plurality of times of detections and judgments on the passageway repeatedly to confirm whether the received signal is the given signal. The method can effectively reduce the misinformation, improve the detection rate and reduce underreports of a system.

In order to solve a problem of a detection blind region in a range finding device of a non-coaxial optical structure, the invention discloses a small optical range finding device, a range finding method, a range finding system and a TIR lens. The small optical range finding device comprises an infrared light emitting module, a receiving module and a signal processing and controlling module. The signal processing and controlling module is connected with the infrared light emitting module and the receiving module. The infrared light emitting module emits infrared detection light which is reflected when meeting an object. The receiving module receives infrared detection light reflected by the object, and converts optical signals into electric signals. The signal processing and controlling signal calculates the distance between the small optical range finding device and the object based on a flight time method. The TIR lens equipped with a light guiding structure is arranged on an infrared detection optical path given out by the infrared light emitting module. The light guiding structure is a groove which is arranged in a position, near one side of the receiving module, of a light emitting face the TIR lens.

The invention discloses a hot rolled steel coil transversely shearing line online flaw detecting device and method, belonging to a device for testing flaws existing in a solid by utilizing ultrasonic waves, in particular relating to a hot rolled steel coil transversely shearing line online flaw detecting device and method. The hot rolled steel coil transversely shearing line online flaw detectingdevice is characterized by being arranged between a steel coil straightener of a transversely shearing line and a flying shear; an ultrasonic flaw detecting device is formed by sequentially connecting a pinch roll, an entrance length measuring mechanism, a width measuring mechanism, an entrance water retaining mechanism, a flaw detecting mechanism, a water scraping plate, an exit water retaining mechanism, an exit length measuring mechanism and an exit blowing mechanism in sequence; flaw detecting electric control instruments and meters are arranged inside an operating room or electric room at a production line side. Detecting flaws by uncoiling firstly and then shearing are realized. The invention has the advantages of novel conception, compact structure and reasonable process. Flaw detecting and transverse shearing are synchronously carried out, a production line operates smoothly, and the working efficiency and the production rate are increased. A probe is in contact with band steel all the time, the detecting dead zone is greatly reduced, the abrasion of the probe is greatly reduced, the service life is prolonged, the consumption of spare parts is lowered, and the production cost is reduced.

The invention provides an automatic astronomical measurement method and system based on video measurement. The measurement method comprises the following steps: importing a contour catalog, acquiringthe number of a target star in the contour catalog, and predicting the area where the target star is located at the current observation time; observing the area where the target star is located at thecurrent observation time, acquiring imaging information, obtaining a star map according to the imaging information, and performing threshold segmentation and star centroid calculation on the star map; converting the star map from pixel coordinates to dial direction coordinates; acquiring azimuth information of a dial, and calculating the target azimuth of the target star by combining with the observation epoch. According to the technical scheme, human eyes are not required for aiming observation, so that detection results are free of personal and instrumental equation and are more accurate; the video device is adjusted according to the area where the target star is located, the detection field of vision can be expanded and the detection blind area can be reduced.

The invention provides a light airplane comprehensive obstacle avoiding system. The light airplane comprehensive obstacle avoiding system comprises data acquisition equipment including aviation bus conversion equipment, GPS (Global Position System) equipment and two high-definition cameras and the like, data processing equipment including two sets of video processing equipment, an embedded type computer, a server and the like, and man-machine interaction equipment including a control panel, sound equipment, a liquid crystal display and the like. The two high-definition cameras are integrated and designed into a nacelle and the optical axes are parallel; and an image plane is parallel or overlapped so that a distance measuring error is reduced. The video processing adopts an FPGA+FIFO+DSP (Field Programmable Gate Array+First-In First-Out-Digital Signal Processor) framework, and a DSP is connected by a high-speed interface. The GPS is fused with a digital map and the like so that known obstacles are avoided. The unknown obstacles are realized by real-time video processing. The server is operated by adopting a website form. The light airplane comprehensive obstacle avoiding system has the advantages that an avionics comprehensive technology, a vision identification technology and a digital map technology are adopted so that a light airplane comprehensive obstacle avoiding function is realized; and the video processing speed is rapid, and the system is economical and intelligent.

The invention discloses a wind field inversion method and system based on an eight-beam wind profile laser radar, a seed source laser generates linearly polarized light, the linearly polarized light is divided into a transmitting signal and a local oscillator signal after passing through a beam splitter, the transmitting signal generates frequency shift through an acousto-optic modulator and is modulated into pulsed light, and the pulsed light is transmitted to the local oscillator signal. The pulsed light is subjected to power amplification treatment by the amplifier, passes through the circulator and is emitted by the telescope; a wind profile laser radar echo signal is received by a telescope, the wind profile laser radar echo signal and a local oscillator signal are jointly input into a coupler, an output result of the coupler is converted into an intermediate-frequency electric signal through a balance detector, the intermediate-frequency electric signal is sampled by an acquisition card, power spectrum estimation is carried out on the sampled echo signal, and through pulse accumulation averaging, the wind profile laser radar echo signal is obtained. Doppler frequency shift is extracted, and inversion of wind speed information of the wind field is achieved. Real-time atmospheric wind field three-dimensional detection with high temporal-spatial resolution, low detection blind area, long distance and high wind measurement precision can be realized.

The invention provides an infrared sensor adjusting method and further provides an infrared sensor adjusting device, a readable storage medium and an air conditioner. The infrared sensor adjusting method comprises the following steps that when the air conditioner receives the detection instruction that the mounting position is determined, an infrared sensor is started; the infrared sensor is controlled to scan a target area so as to obtain temperature data of the target area and position information of a human body heat source in the target area; according to the mounting position of the air conditioner, the detection angle of the infrared sensor is adjusted; and the infrared sensor is used for scanning the target area to obtain the temperature data of the target area and position information of the human body heat source. According to the infrared sensor adjusting method, the influence of the mounting position of the air conditioner on the situation that the air conditioner automatically determines the mounting position of the air conditioner is avoided.

The invention discloses a vehicle collision early-warning method and system, a vehicle and a storage medium. The method comprises the following steps: carrying out obstacle detection by virtue of a radar sensor and a camera; determining an early-warning level according to a detection result of the radar sensor and a detection result of the camera; determining the virtual images of an obstacle corresponding to the early-warning level; and outputting and displaying the real environment images shot by the camera, and superposing and displaying the virtual images on the real environment images, wherein the virtual images of the obstacles corresponding to different early-warning levels are different. By implementing the embodiment of the invention, detection dead zones for the obstacle can be reduced, so that the collision risk of the vehicle is lowered.

The invention discloses an ultrasonic phased array weld defect detection method based on oblique incidence. An ultrasonic phased array detection system is included, and ultrasonic phased array detection steps are included, wherein the ultrasonic phased array detection system comprises a signal collecting system, a transducer probe, an organic glass wedge block, an aqueous solution connecting the organic glass wedge block with the test block surface, a coupling agent connecting the transducer probe with the organic glass wedge block and a computer used for calculating data of the signal collecting system. Accordingly, the defects can be well detected, a non-detection zone is reduced, the detection robustness and resolution are improved, the imaging quality of a far-field region can be obviously improved, and the imaging resolution and defect detection rate are increased.

The invention discloses an automatic multi-frequency array ultrasonic non-destructive testing device and method for ring parts. An array of multi-frequency probes on the end face, a multi-channel ultrasonic detector, an industrial computer, and a control cabinet; the array of multi-frequency probes on the outer circular surface includes multiple columns of probes with different frequencies, which are used to detect defects at different radial depths of rings, The end-face multi-frequency probe array includes multiple rows of probes with different frequencies, which are used to detect defects at different depths in the axial direction of the ring. The invention uses multi-frequency array probes to realize automatic layered detection of internal defects of ring parts, and has the advantages of high efficiency, simple operation, small detection blind area, high detection precision, strong adaptability and the like.

The invention relates to a micro blind area focusing ultrasonic probe for manually detecting a composite material component, and is used for manually detecting internal defects of a composite material. The ultrasonic probe comprises an ultrasonic transducer, a sealing cover, a coupling agent inner cavity shell, a water bag and a water distance adjusting support. According to the ultrasonic probe, a stable coupling layer is guaranteed to be formed between the transducer and the surface of a detected composite material component, and material damage due to water immersion or water spraying coupling of a medium during ultrasonic detection is avoided; a sound beam focal point is guaranteed to be accurately positioned on the surface or near the surface of the composite material, and the water distance is continuously adjustable during detection; the incident resolving power of an ultrasonic pulse is guaranteed, the detection blind area is reduced, and the reliability and efficiency of the composite material ultrasonic manual detection are improved.

The invention discloses an adjustable weld inspection guided wave probe and a use method of the adjustable weld inspection guided wave probe. The adjustable weld inspection guided wave probe comprises a detachable hinge between upper ends of a transmitting probe and a receiving probe, bar-shaped magnets at two sides of the bottom surface of a metal housing along the width direction, flexible sound insulation strips at two sides of the bottom of the probe along the length direction, and a wedge made of a polyurethane material with excellent wear resistance, flexibility and sound permeability, wherein the detachable hinge can be used for adjusting an included angle between the transmitting probe and the receiving probe and enabling the transmitting probe and the receiving probe to be transversely arranged on a wider weld in parallel or enabling the transmitting probe and the receiving probe to be arranged on a narrower weld along the longitudinal direction of the weld front and back so that the transmitting probe, the receiving probe and the weld are optimally coupled. The flexible wedge can be used for enabling a larger coupling surface to be available between the probes and the weld, and the bar-shaped magnets are attracted on the weld for being coupled and fixed, thus a stable echo signal with less clutters is obtained. The adjustable weld inspection guided wave probe is simple in structure and convenient and flexible to use and operate, and is improved in detection accuracy.

The invention discloses a transmitted waveform design method suitable for an automotive anti-collision radar, and a target detection algorithm. The method comprises the following steps: determining asystem of a radar transmitted signal as a multi-order linear frequency keying system; determining parameters of transmitted waveform according to given indicators, wherein the given indicators comprises radar transmitting frequency band, maximum detection distance, maximum detection speed, distance resolution, ranging accuracy, rate accuracy and frequency domain minimum detectable signal-to-noiseratio, and the parameters required for determining one waveform comprise frequency-modulation bandwidth, coherent processing interval, the amount of the LFSK signal, stepping number of each LFSK signal, and initial frequency difference between the LFSK signals; processing the echo data of the transmitted signal, and solving the target distance and speed. The design method disclosed by the invention is moderate in calculated quantity, the detection precision is improved on the basis that the ranging is unambiguous, and the detection dead zone caused by transmitting-receiving leakage is effectively reduced.

The invention provides a safe driving method of a road roller and the road roller. The safe driving method comprises the steps that the road roller runs at a preset speed; the distance between an obstacle and the road roller is continuously detected; if the distance is larger than or equal to a first preset distance, the preset speed of the road roller is kept; if the distance is smaller than thefirst preset distance and is larger than or equal to a second preset distance, the road roller is controlled to run at a first speed smaller than the preset speed; if the distance is smaller than thesecond preset distance, the road roller is controlled to stop running. According to the technical scheme, the distance between the obstacle and the road roller is continuously detected, and measures such as deceleration and stopping are taken along with the reduction of the distance; the obstacle is avoided through an electronic fence, the problem about recognition of concave positions under the ground surface is solved, the active obstacle avoiding capability of the road roller is improved, the occurrence of safety accidents is avoided, and the running safety of the road roller is improved.

The invention discloses a whole-course transient electromagnetism synchronous depth sounding device. The device comprises a transmitting coil, double-receiving coils and a multichannel receiver which is matched with the transmitting coil and the double-receiving coils. The double-receiving coils are composed of the first receiving coil and the second receiving coil, the second receiving coil is located in the first receiving coil, the first receiving coil and the second receiving coil are located in a same plane, and the common midpoint type is adopted; the transmitting coil is located on the peripheries of the double-receiving coils. The transmitting coil and the double-receiving coils are combined in a common midpoint mode or a common center shaft mode, and gaps are reserved between the transmitting coil and the double-receiving coils. According to the device, the signals of the transmitting coil and the signals of the double-receiving coils can be synchronously collected. The size of the transmitting coil is larger than the size of the receiving coils, the mutual inductance influence can be reduced, and the signal to noise ratio and sensitivity can be improved. By the adoption of the double-receiving coil-double channel synchronous measuring device, field signals in the later period and field signals in the early period can be effectively measured respectively, on the basis of ensuring mid-depth layer detectivity, detecting blind zones are reduced, and the superficial zone detecting effect is improved. A traditional center loop line measuring device type is unchanged, and the device is convenient and quick to detect and construct.