48 results about "Air coupled" patented technology

The invention provides an ultrasonic detection method and system for inverting residual stress by using sound wave phase velocity, and belongs to the field of air coupling ultrasonic guided wave detection. The method is based on an air coupling ultrasonic guided wave sound field propagation finite element model, and guides optimization design of air coupling ultrasonic transducer parameters. The air coupling ultrasonic guided wave detection technology is adopted for conducting non-contact excitation and receiving of guided wave signals on the composite material component with the preset stress through the stretcher. And calculating the phase velocity of the air-coupled ultrasonic guided wave in the composite material component based on a geometric positioning and time difference cooperative gradual difference method. And calibrating the phase velocity in the target composite material and preset stress to obtain a corresponding relational expression, performing phase velocity detection on a composite material component with unknown stress based on a calibration result of the target composite material, and performing inversion to obtain composite material construction residual stress. By adopting the method and the system, the residual stress detection of the composite material component is realized.

An air-coupled ultrasonic scanning platform for an air-coupled ultrasonic non-contact metrology of battery electrodes that maps the local variation in density and thickness, and detect defects during electrode casting and drying, includes: piezocomposite air-coupled transducers (Ultran) at 0.5 to 1 MHz that provide sufficient air coupling to enable sound waves to travel through air from a transmitting transducer, through the thin film electrode coated on metal current collector, and then into the receiving transducer. Non-contact, air-coupled ultrasound may be used as a technique for evaluating battery electrode films. An analytical model was derived from fundamental acoustic wave propagation principles to determine acoustic density. Voltage gain or acoustic density maps of electrode films revealed features that are not visually apparent, attributed to mass gradients.

The invention discloses a shaft defect rapid detection method. The method comprises the steps of detection area planning and signal acquisition, signal processing and defect judgment reference determination, space mapping and defect judgment and the like. The shaft defect rapid detection method is based on an air coupling impact echo method and is a nondestructive detection method aiming at shaft detection defects, and rapid data acquisition can be realized through response of an air coupling sensor acquisition structure to an impact echo signal; the intact position and the position with cracks or defects can be clearly distinguished under the condition that the main frequency intervals are overlapped by analyzing the energy ratio of the spectrogram; by drawing the defect cloud picture, the defect information can be visually displayed, and the difficulty of manual judgment can be reduced. According to the shaft defect rapid detection method, the engineering application problems of low detection efficiency, high main frequency misjudgment rate and the like can be solved on the premise of realizing non-contact detection, and a theoretical basis and data support can be provided for performing efficient, high-precision and high-adaptability nondestructive detection evaluation on the shaft.

The invention discloses a lithium battery full life cycle health state monitoring method, belongs to the technical field of lithium ion battery detection, and aims to identify pore defects and dynamic bubble behaviors in a battery in real time. According to the method, broadband ultrasonic waves are emitted through an air coupling multi-probe array, and back scattering signals caused by bubbles and uneven structures in a battery in the charging and discharging process are collected. And in combination with a porous medium acoustic theory, extracting time domain and frequency domain characteristic parameters related to the bubble form and distribution, and inputting the time domain and frequency domain characteristic parameters into a preset bubble state-signal response model. On the basis, the evolution state of the internal gas production defect of the battery is judged, so that effective support is provided for fault early warning and safe operation of the lithium ion battery. The method has the remarkable advantages of simplicity and convenience in operation, high real-time performance, high accuracy and the like, and can be widely applied to online detection and quality control of a battery production line.

The utility model discloses a kind of non-contact optical coherence elastic imaging endoscope devices, comprising: non-contact ultrasonic excitation and optical detection integrated probe and high-speed sweep frequency laser, the integrated probe includes air-coupled ultrasonic transducer, collimating optical fiber, off-axis parabolic mirror and polymer resin packaging shell, air-coupled ultrasonic transducer diameter is not greater than 2.5 mm, center frequency is not less than 250 kHz, collimating optical fiber is single-mode fiber and emission end integrated collimator is used to produce collimating beam, off-axis parabolic mirror focal length is greater than 7 mm, the polymer resin packaging shell is used to integrally package integrated probe, the polymer resin packaging shell is designed using 3D printing, and it is windowed at the exit end of the off-axis parabolic mirror;The scanning speed of this high-speed sweep frequency laser is 100 kHz, center wavelength 1310 nm, bandwidth 100 nm, synchronous output trigger clock and sampling clock.

The invention provides a terahertz MIMO array imaging device and an air coupling calibration method thereof, and relates to the technical field of terahertz imaging and microwave measurement, and the device comprises a vector network analyzer which is used for transmitting a step frequency continuous wave signal and receiving an echo signal; the radio frequency interfaces of the terahertz frequency doubling transmitting modules are connected to the radio frequency port of the vector network analyzer through radio frequency cables; a plurality of terahertz frequency multiplication receiving modules, wherein intermediate frequency interfaces and local oscillator interfaces of the terahertz frequency multiplication receiving modules are respectively connected to an intermediate frequency input port and a local oscillator output port of the vector network analyzer through cables; the at least one calibration module is fixed on the column of the array frame, is positioned obliquely below the transmitting module and the receiving module, and points to the transmitting module and the receiving module obliquely and upwards; the transmitting module and the receiving module are arranged into a linear MIMO array.

The application discloses a kind of vehicle-mounted tunnel lining defect detection device and method, wherein the method comprises: tunnel lining interior fine detection mechanism is with mechanical arm swing mode and vertical lifting mode, respectively with the ground coupling type geological radar antenna carried, extend to tunnel lining surface, and the spacing between ground coupling type geological radar antenna and tunnel lining surface is controlled in preset distance interval;Tunnel lining interior rapid screening device is with mechanical electric drive servo dynamic adjustment air-coupled geological radar antenna carried;Detection data evaluation system carries out the calculation of tunnel lining quality index, and obtains tunnel lining defect detection result;The tunnel lining quality index reflects the degree of tunnel lining defect.The application can improve the efficiency and accuracy of vehicle-mounted tunnel lining defect detection.

This invention discloses a device and its application method for food quality testing based on air-coupled ultrasound technology, relating to the field of fruit and vegetable quality testing technology. The device includes a base plate with two opposing detection mechanisms slidably mounted on it along the Y-axis, and a placement platform between the mechanisms. The placement platform is mounted on a horizontal moving mechanism and moves up and down along the Z-axis with the vertical moving mechanism, enabling sample adjustment in the X and Z-axis directions. The detection mechanisms hold the ultrasonic transducer using a four-jaw chuck. Utilizing the independent adjustment characteristics of the four jaws of the chuck, combined with the A-scan waveform fed back from the ultrasonic pulse transceiver, precise coaxial alignment of the acoustic centers of the transmitting and receiving probes is achieved. This invention effectively solves the problems of large mechanical vibration, difficulty in aligning the acoustic center of the probe, and difficulty in performing repeatable grid scanning in existing devices, providing a stable and reliable hardware platform for texture evaluation and internal structure imaging of fruits, vegetables, and other foods.

The invention provides a Lamb wave benchmark-free damage imaging method based on adaptive clustering and semantic weighting, and belongs to the technical field of air coupling ultrasonic detection.The Lamb wave benchmark-free damage imaging method comprises the steps that a full-path response signal is collected through orthogonal scanning, a wavelet low-frequency approximation coefficient and a normalized symmetric difference factor are extracted to construct a joint feature vector; and performing unsupervised division of'health-damage 'states on a scanning path by adopting DBSCAN clustering. And semantic tags obtained by clustering are further used as adaptive weights to be embedded into the improved RAPID probability imaging model, and dynamic construction of artifact path suppression and soft reference is realized. In a layering defect detection experiment of the carbon fiber reinforced composite material, compared with a traditional RAPID method, the average size measurement error is reduced by 50.5% under the condition that an independent health reference is completely not needed, the measurement precision of 40 * 20 * 0.05 mm defects in the X / Y direction is improved by 81.7%, the measurement precision of 40 * 20 * 0.05 mm defects in the Y / X direction is improved by 65.5%, and meanwhile 92.3% of boundary artifacts are effectively restrained.

The invention provides a multi-parameter performance detection system and method for a polyphenyl ether foaming material, and the method comprises the steps: carrying out the time domain demodulation of terahertz time domain waveform data of the polyphenyl ether foaming material, extracting a first characteristic parameter representing the near-surface defect of the material, carrying out the frequency domain recognition of an ultrasonic transmission signal of the polyphenyl ether foaming material, and carrying out the detection of the near-surface defect of the material; extracting a second characteristic parameter representing the internal defect and the thickness change of the material; performing feature fusion on the first feature parameter and the second feature parameter by using sensor confidence coefficients of a terahertz time-domain spectrum sensor and an air coupling ultrasonic sensor to obtain a defect feature vector of the polyphenyl ether foaming material; and using the defect feature vectors to distinguish defect types and position defect positions, comparing the defect types with a pre-stored acceptance standard threshold, and generating a disposal decision instruction of the current polyphenyl ether foaming material. Based on the scheme, the adaptive fusion of the multi-modal sensing data and the defect probability confidence can be realized, so that the judgment precision of online nondestructive testing of the polyphenyl ether foaming material can be improved.

The invention relates to an ultrasonic array sensor (100) for detecting distances between a vehicle and objects in the surroundings of the vehicle, comprising at least one diaphragm component (110) having a vibrating diaphragm (111) and a cavity (113) in the interior of the diaphragm component (110); and at least two transducer elements (130), wherein each transducer element (130) is mechanically coupled to a diaphragm region (112), wherein the ultrasonic array sensor (100) has a support structure (120) which is arranged in the cavity (113) of the diaphragm component (110) and contacts a contact region of the diaphragm (111) on the inner side (118), as a result of which the diaphragm (111) is divided into at least two separate vibrating diaphragm regions (112), wherein the support structure (120) creates a natural frequency distance Δf eig between the different vibration modes of the diaphragm (111) of the ultrasonic array sensor (100) of less than or equal to 10% with respect to the operating frequency op of the ultrasonic array sensor (100).

An ultrasonic automatic flaw detection device belongs to the technical field of ultrasonic flaw detection, and aims to solve the problems that surface interference is mistakenly judged as internal cracks or inclusions and damage is caused by direct contact between a probe and a large shaft. The ultrasonic automatic flaw detection device comprises a rack, a driving part is mounted in the rack, and a moving plate is arranged on the surface of the driving part; a high-frequency alternating magnetic field is excited through the electromagnetic coil, obstacles such as rust layer protrusions and weld beading on the surface of the large shaft can be penetrated, ultrasonic waves are directly generated in a metal base body, an ultrasonic probe does not need to make contact with the large shaft, on one hand, the ultrasonic probe is not prone to damage, and on the other hand, the ultrasonic probe is not prone to damage. On the one hand, false signals generated by barrier reflection of a traditional contact type probe are avoided, the misjudgment rate is reduced, on the other hand, ultrasonic reflected waves can be received through air coupling without a coupling agent, energy loss caused by non-uniform smearing of the coupling agent is reduced, and interference of surface barriers on detection is eliminated.

The utility model relates to a kind of arch top unmanned detection devices of power generation diversion tunnel inclined shaft section lining structure, and it is related to tunnel detection technical field, it includes traction mechanism, walking mechanism, adjusting mechanism and detection mechanism.Traction mechanism is connected with walking mechanism;Adjusting mechanism includes first telescopic unit and second telescopic unit, first telescopic unit is installed in walking mechanism and is connected with second telescopic unit;Detection mechanism includes detection platform, air coupled radar and ranging sensor, detection platform is installed in second telescopic unit, and air coupled radar and ranging sensor are all installed in detection platform;Second telescopic unit is connected with detection platform;First telescopic unit is used to drive second telescopic unit and detection platform reciprocating linear motion in first direction relative to walking mechanism;Second telescopic unit is used to drive detection platform to lift in second direction relative to walking mechanism;First direction and second direction have included angle.It is flexible to control, and stability is high, safety is high, and detection result is accurate and reliable.

An automatic ultrasonic flaw detection device, belonging to the field of ultrasonic flaw detection technology, aims to solve the problems of misjudging surface interference as internal cracks or inclusions and damage caused by direct contact between the probe and the shaft. The invention includes a frame, a drive component installed inside the frame, a movable plate on the surface of the drive component, a fixed cylinder fixedly installed inside the movable plate, and a fixed column slidably connected inside the fixed cylinder. This invention uses an electromagnetic coil to excite a high-frequency alternating magnetic field, which can penetrate obstacles such as rust protrusions and weld beads on the surface of the shaft, directly generating ultrasonic waves in the metal substrate. This eliminates the need for the ultrasonic probe to contact the shaft. On the one hand, it avoids false signals generated by reflections from obstacles in traditional contact probes, reducing the false judgment rate. On the other hand, it can receive ultrasonic reflected waves through air coupling without the need for a coupling agent, reducing energy loss caused by uneven application of the coupling agent and eliminating interference from surface obstacles.

An air coupling ultrasonic excitation device for testing dynamic characteristics of a wafer-level MEMS microstructure comprises an ultrasonic probe, a laser and a rectangular frame, and a plurality of fixing modules are evenly distributed on the circumference of the rectangular frame. An X-axis sliding assembly and a Y-axis sliding assembly are installed on the lower portion of the rectangular frame, and an ultrasonic excitation module is fixed to the Y-axis sliding assembly. The ultrasonic vibration excitation module comprises a mounting bottom plate, a CCD camera is arranged on the mounting bottom plate, a mounting seat is supported on the mounting bottom plate, a lens at the upper end of the CCD camera is inserted into the mounting seat, through holes are formed in the peripheral side walls of the mounting seat respectively, and the two lasers are inserted into the two through holes respectively; and an ultrasonic probe and a lighting source are respectively inserted into the other two through holes and intersect with the axes of the two lasers at one point. The device can be applied to the dynamic test of the wafer-level MEMS microstructure, ultrasonic waves can be quickly and accurately focused on the surface of the microstructure to be tested, and non-contact excitation of any microstructure on an MEMS wafer is achieved.

The invention relates to a PE pipeline ultrasonic detection device and method, the device comprises a support mechanism, an adjusting structure, a support arm mechanism, a rotating mechanism, a transverse moving mechanism, a transmission mechanism and a driving mechanism, an annular support sleeves a pipeline, and an electric push rod adjusts the support arm mechanism to realize contact between a rubber wheel and the pipeline; the laser ultrasonic excitation module emits pulse laser to excite nonlinear ultrasonic waves, and the air coupling sensor array synchronously rotates to collect all-circumferential signals; the transmission mechanism drives the rotating ring to achieve 360-degree dynamic scanning through bevel gear transmission, and the servo motor controls the laser module to move axially. The detection method comprises the steps of equipment deployment, full circumferential scanning, nonlinear parameter extraction and intelligent defect identification, modal guided waves are separated by adopting synchronous compression wavelet transform, multi-modal features are analyzed in combination with a CNN-LSTM network, the limitation of traditional contact type detection is broken through, and efficient detection in a non-contact and under-pressure environment is achieved.

The invention discloses a high-temperature-resistant air coupling type ultrasonic transducer without an adhesion layer. The high-temperature-resistant air coupling type ultrasonic transducer comprises a sealing shell, a sealing cover plate, a prestressed bolt, an insulating spacer, piezoelectric ceramics, a matching layer and an insulating wrapping layer, the matching layer is arranged at the front end in the sealing shell, the piezoelectric ceramic is arranged behind the matching layer, and the front end face of the piezoelectric ceramic is attached to the back face of the matching layer; the insulating wrapping layer wraps the outer periphery of the piezoelectric ceramic, and an insulating spacer is arranged behind the piezoelectric ceramic; the prestressed bolt is arranged behind the insulating spacer; the outer periphery of the prestressed bolt is provided with an external thread, the inner wall of the sealing shell is provided with a matched internal thread, and the external thread of the prestressed bolt is matched with the internal thread of the sealing shell and compresses the insulating spacer, the piezoelectric ceramic and the matching layer, so that the piezoelectric ceramic and the matching layer are tightly attached. The ACUT has high-temperature adaptability, the transmitting sound pressure sensitivity and the receiving voltage sensitivity of the ACUT are improved, and the effective propagation distance is prolonged.

The invention belongs to the field of nondestructive detection and online detection, and particularly relates to a system and a method for nondestructive online detection of a SiCf / SiC composite material based on photoacoustic imaging. According to the invention, the photoacoustic imaging is applied to the nondestructive testing of the SiCf / SiC composite material for the first time, the pulse laser excitation unit and the submersible photoacoustic detection assembly are used in the water immersion scanning system, and through a specific light beam shaping light path and the submersible detection assembly, the nondestructive testing of the SiCf / SiC composite material is realized. The problems of large signal attenuation, strong interface reflection and the like of a composite pipe under air coupling are solved.

The invention relates to the technical field of silk making, in particular to combined silkworm chrysalis killing processing equipment which is used for killing silkworm chrysalis in the initial stage of fresh cocoon drying and comprises a processing main body and a belt conveyor, a processing cavity for processing silkworm cocoons is formed in the processing main body, and the processing main body is provided with a moisture exhausting and air exhausting device communicated with the interior and the exterior of the processing cavity; an upper belt of the belt conveyor horizontally penetrates through a machining cavity in the machining body, and the head and the tail of the belt conveyor are both exposed out of the machining body. A plurality of medium wave infrared emitters and a plurality of air coupling ultrasonic emitters are arranged in the processing main body, and the infrared emitters and the ultrasonic emitters are arranged above an upper belt of the belt conveyor. The equipment can be used in cooperation with a conventional hot air circulation silkworm cocoon drying machine and can also be used in cooperation with drying equipment for microwave drying of silkworm cocoons and the like. The equipment realizes uniform heating inside and outside the cocoon shells, avoids the problem of instantaneous overheating of the cocoon shells caused by traditional hot air microwaves and the problem of pupa explosion of microwave-dried silkworm cocoons, and protects the quality of the cocoon shells.

This invention discloses a non-destructive evaluation method and apparatus for the density of selective laser melting additive manufacturing components. The method includes: exciting an ultrasonic guided wave at a specific frequency in the workpiece under test using an air-coupled ultrasonic transducer; receiving the ultrasonic signal using the air-coupled ultrasonic transducer; analyzing the phase change of the ultrasonic guided wave at the specific frequency; and using a convolutional neural network model to obtain the mapping relationship between the phase change and the density of the test piece, thereby predicting the density of the selective laser melting sample. This invention overcomes the problems of low detection efficiency, high cost, and the need for destructive testing in conventional selective laser melting component density detection methods, achieving non-contact, high-precision, non-destructive testing of the density of selective laser melting components, thus improving detection efficiency, accuracy, and flexibility.

The invention provides a circularly polarized antenna and Internet of Things equipment. The circularly polarized antenna comprises an antenna radiator, a feed wire, a first fixing structure and a second fixing structure. According to the circularly polarized antenna disclosed by the invention, the circularly polarized wave can be effectively generated through the frame body, the first branch knot and the second branch knot in the antenna radiator, so that the problem of polarization mismatch is reduced, and the signal receiving quality and the system communication efficiency are improved. The feed wire and the antenna radiator are matched with a proper projection coincidence area, and an air coupling feed mode is adopted to transmit energy to the antenna radiator, so that efficient signal transmission and excellent circular polarization characteristics of the circularly polarized antenna are realized. In addition, circularly polarized waves are realized through the structural design of the antenna radiator and the feed wire, so that the circularly polarized antenna is small in size, high in gain and easy to conform.

The invention discloses an ultra-wide stop-band low-intermodulation suspended strip line filter band stop sheet, which relates to the technical field of filters, and comprises a filter shell, the filter band stop sheet is suspended in the filter shell through a band stop sheet medium, and a plurality of groups of filter resonant columns are fixedly arranged in the filter shell. The joint inner core is fixedly connected with the band stop sheet medium; the joint inner core filter is in air coupling with the resonant column to realize a filtering effect; according to the ultra-wide stopband low-intermodulation suspended strip line filter band-stop sheet, the distance between the joint inner core and the filter resonant column is adjusted through the filter cavity, the filter band-stop sheet, the band-stop sheet medium, the filter resonant column and the filter joint, so that the requirements of frequency, loss suppression and the like of a required product are met; traditional accessories such as a large cavity, a machining resonance column and a flying inductor are omitted, the size and the occupied area of the filter are reduced, and the assembly process of the filter is simplified.

A method for measuring an air-coupled ultrasonic stress by extracting a Lyapunov exponent peak of a low signal-to-noise ratio air-coupled ultrasonic signal through a moving window. In view that the ch

The application discloses an air coupling-based composite material ultrasonic detection method, which is applied to a workpiece to be detected, and the workpiece to be detected is composed of a composite material. The method comprises the following steps: a sound field reference model corresponding to the workpiece to be detected is constructed; a detection ultrasonic signal is sent to a detection area of the workpiece to be detected, and mixed sound field data corresponding to the detection area is received; based on the sound field reference model, signal separation processing is performed on the mixed sound field data, and internal reflection signals are obtained; spatial distribution analysis is performed on the internal reflection signals, and a defect detection result corresponding to the workpiece to be detected is obtained. Through the technical features of the application, the reflection signals interfering with the detection result can be separated in the process of ultrasonic detection of the workpiece to be detected, so that the reliability and accuracy of internal defect identification of the workpiece to be detected are improved.

This invention relates to a method and system for locating hot cracks in DED thin-walled parts based on multi-source acoustic emission. The method includes: arranging at least three air-coupled acoustic emission (AE) sensors non-collinearly above the DED forming stage, and pre-calibrating the three-dimensional spatial coordinates of each AE sensor; during the layer-by-layer deposition of the thin-walled part, synchronously acquiring acoustic signals radiated into the air when hot cracks initiate using the AE sensors, and preprocessing the acoustic signals; extracting pulse characteristic signals characterizing hot crack initiation from the preprocessed multi-channel acoustic emission signals, and calculating the time difference between multiple pulse characteristic signals acquired by each AE sensor; constructing a spherical wave hyperbolic positioning equation set, and obtaining the height coordinates of the upper surface of the thin-walled part where the hot crack source is located; and calculating the spatial coordinates of the hot crack source based on the three-dimensional spatial coordinates of each AE sensor, the time difference of each pulse characteristic signal, and the height coordinates.

Ultrasonic array sensor (100) for detecting distances between a vehicle and objects in the vicinity of the vehicle, comprising at least one membrane component (110) having a vibrating membrane (111) and a cavity (113) inside the membrane component (110); and at least two transducer elements (130), wherein each transducer element (130) is mechanically coupled to a membrane region (112), wherein the ultrasonic array sensor (100) has a support structure (120) which is arranged in the cavity (113) of the membrane component (110) and contacts a contact area of ​​the membrane (111) on the inside (118), thereby dividing the membrane (111) into at least two separate vibrating membrane regions (112), wherein the support structure (120) has a natural frequency spacing Δg.The difference between the different vibration modes of the membrane (111) of the ultrasonic array sensor (100) with respect to the operating frequency of the ultrasonic array sensor (100) is less than or equal to 10%.

The invention discloses an air coupling Lamb wave detection device and method for a ceramic matrix composite component, and belongs to the technical field of ultrasonic nondestructive detection. Comprising a control system, a six-degree-of-freedom industrial robot, a detection system arranged at the tail end of the six-degree-of-freedom industrial robot, and a ceramic matrix composite spraying pipe arranged at the end, away from the six-degree-of-freedom industrial robot, of the detection system. The spray pipe clamping mechanism is arranged below the ceramic matrix composite spray pipe; the spray pipe rotating mechanism is arranged below the spray pipe clamping mechanism; through mutual cooperation of all the parts, an air coupling ultrasonic lamb wave detection method and an automatic detection system are applied, and automatic detection of internal defects of the ceramic matrix composite spraying pipe of the airspace engine is achieved. According to the air coupling Lamb wave detection device and method for the ceramic-based composite component, nondestructive evaluation is carried out on the internal quality of the ceramic-based composite spray pipe, and the device and method have important significance on development of the spaceflight cause.

The invention discloses a brain glioma detection device for mechanical arm assisted light sheet optical coherence elastography, which is characterized in that a millimeter-level air coupling ultrasonic excitation probe and a virtual scanning light sheet probe are jointly integrated to a mechanical arm, and non-destructive and non-contact excitation is performed on brain glioma tissues by utilizing air coupling ultrasound; the scanning light sheet is used for detecting and collecting three-dimensional structure and elasticity modulus information of brain glioma tissues; an integrated mechanical arm is used for clamping an X-ray plate scanning probe to carry out large-range elastic imaging scanning on a suspicious focus area of brain tissue, and mechanical scanning positioning and self-adaptive registration of a three-dimensional structure of the brain tissue are achieved through programming according to irregular morphology characteristics of the brain tissue; according to the system device, use of a coupling agent is avoided, nondestructive, non-contact, high-spatial-resolution and large-view-field-range self-adaptive elastic imaging of the brain glioma boundary is achieved, a doctor can be assisted in tumor excision in an operation, and it is guaranteed that normal brain tissue is not damaged while tumor excision is conducted in the maximum range.

The invention provides an automatic measurement method and device for a sound field of an air coupling ring array ultrasonic transducer, and belongs to the technical field of ultrasonic detection. The method comprises the following steps: fixing an air coupling ring array ultrasonic transducer at the tail end of a transmitting end clamping mechanism, fixing a photoacoustic sensor at the tail end of a receiving end clamping mechanism, and controlling an air coupling array ultrasonic detector to excite the transducer to transmit a pulse signal, and a receiving end clamping mechanism carries the photoacoustic sensor to scan according to a bow-shaped track to obtain a pulse sound field signal, sound pressure amplitude distribution is obtained through processing, and a sound field sound pressure distribution diagram is generated. The device is composed of a transmitting end clamping mechanism, a receiving end clamping mechanism, an air coupling ring array ultrasonic transducer, a photoacoustic sensor system, a control mechanism and the like. By adopting the method and the device for automatically measuring the sound field of the air-coupled annular array ultrasonic transducer, the sound field characteristics of the air-coupled annular array ultrasonic transducer can be conveniently and automatically measured.

The utility model belongs to the technical field of acoustic emission sensors, and particularly relates to an air coupling acoustic emission sensor, which is characterized in that a receiver, a piezoelectric transduction device and a coaxial cable are arranged in a matched manner, and internal stress waves of materials enter the sensor from air through a receiving hole in the receiver; a piezoelectric film of the piezoelectric transduction device vibrates, so that the surfaces of an upper electrode and a lower electrode generate polarization proportional to the surface of the piezoelectric film, charges are generated, an array transducer converts the charges into analog quantity electric signals, and the analog quantity electric signals are output from a shielding cable to a coaxial cable through an electrode plate to form analog signal output of the sensor; according to the utility model, the impedance matching layer surrounds the array transducer, so that the influence of external interference on the signal conversion and transmission of the sensor is further reduced. The sensor structure disclosed by the utility model does not need to be in direct contact with a material to realize measurement, so that the limitation of an installation position and an environment on the sensor is reduced, and the measurement precision and stability are improved.