99 results about "Air coupled" patented technology

The invention discloses a steel-concrete joint surface defect identification method based on air coupling ultrasonic guided waves, which comprises the following steps: S1, selecting an ultrasonic guided wave mode and a probe frequency, and determining an incident angle theta of an air coupling excitation probe; s2, constructing a detection system according to the parameters in the step S1; s3, constructing a data set, wherein the acquisition mode of the sample of the ultrasonic guided wave signal in the data set comprises the following steps of: performing actual detection by adopting the detection system to obtain the sample of the ultrasonic guided wave signal; by solving the air coupling ultrasonic three-dimensional finite element calculation model, obtaining a sample of an ultrasonic guided wave signal under the condition that interference factors and joint surface defects exist; s4, training the recognition model by using the data set; the input of the recognition model is the time domain feature and the frequency domain feature of the ultrasonic guided wave signal, and the output of the recognition model is a defect probability value of a measuring point corresponding to the ultrasonic guided wave signal; and S5, identifying the ultrasonic guided wave signal of each measuring point by adopting the trained identification model so as to calculate the defect probability of each measuring point.

The invention relates to an air coupling ultrasonic signal processing method based on a COA-VMD combined improvement wavelet threshold, and the method specifically comprises the following steps: 1, employing a meta-heuristic algorithm Coati, and introducing a minimum envelope entropy as a fitness function of the algorithm, and taking the minimum envelope entropy as an evaluation criterion of an optimal solution; 2, decomposing a noisy part in the air coupling ultrasonic signal into a plurality of intrinsic mode function components by using the optimized VMD decomposition parameters; and 3, on the basis of the step 2, distinguishing an effective ultrasonic signal component f1 and a noise component f2 in the detected IMF components by adopting a correlation coefficient method. And step 4, processing the noise component f2 by adopting an improved wavelet threshold function algorithm to obtain a noise-reduced air coupling ultrasonic signal. According to the method, COA-VMD and an improved wavelet threshold noise reduction method are combined, the signal-to-noise ratio is effectively improved, and a technical basis is provided for high-precision detection of defects in the honeycomb sandwich structure.

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.

The invention belongs to the technical field of converter transformers, and particularly discloses a converter transformer vibration noise control method and system, a terminal and a medium, and the method comprises the steps: constructing a converter transformer structure geometric model, setting material attributes, and carrying out the grid division; based on the geometric model, establishing an electromagnetic field simulation model, applying excitation conditions, obtaining electromagnetic field distribution, establishing an iron core magnetostriction mathematical model, calculating vibration acceleration caused by magnetostriction and transient electromagnetic force of an iron core and a winding, and solving and extracting a displacement field and stress-strain response; establishing an acoustic coupling model on the basis of a structure vibration result, and calculating sound pressure level distribution under different frequencies by setting a structure-air coupling boundary and a matching layer; according to an acoustic simulation result, an iron core positioning structure and an oil tank reinforcing rib arrangement mode are optimized, vibration noise prediction and control of the converter transformer in a multi-harmonic excitation environment are realized, and equipment structure stability, operation reliability and environment adaptability are improved.

The invention provides an airflow drying and surface modification technology for lemon fibers, relates to the technical field of lemon surface processing, and realizes the whole process optimization of lemon fiber production through ultrasonic-microwave synergistic extraction, pulse type ultrasonic-hot air coupling airflow drying, low-temperature plasma surface modification and an intelligent control system based on Q-learning. The pectin yield is increased by about 20% through ultrasonic-microwave synergistic extraction, the extraction time is shortened by 50%, flow drying is assisted by double-frequency ultrasonic waves and magnetized water mist, the drying time is shortened by 50%, the energy consumption is reduced by 20%, the fiber softness is improved by 15%, the fiber is endowed with 99% antibacterial rate and excellent hydrophilicity through low-temperature plasma modification, chemical reagents are not needed, and environmental pollution is reduced. The intelligent control system converts waste liquid into ethanol and lactic acid through real-time data optimization and closed-loop resource utilization, zero waste discharge is achieved, the ethanol yield is increased by 12%, the additional value of lemon peel byproducts is remarkably increased, and the method is suitable for the fields of food and materials and conforms to the green chemistry concept.

The invention belongs to the technical field of acoustic emission sensors, and particularly relates to an acoustic emission sensor and an acoustic emission energy signal separation method, a time domain signal data set is obtained by emitting a plurality of single-frequency excitation signal receiving echoes, then time-frequency analysis, feature extraction, principal component analysis and clustering analysis are performed, and dispersion model verification is input. And separating the signal into a reflection signal, a transmission signal and a noise signal, and finally reconstructing the transmission signal and evaluating the separation signal to obtain a high-quality separation transmission signal. By analyzing the diffusion characteristics of sound waves with different frequencies in the material, the reflection signal, the transmission signal and the environmental noise are effectively distinguished, so that the energy signal actually penetrating through the object is accurately identified. High-quality separation transmission signals are used for air coupling ultrasonic detection, interference of reflection signals and noise signals is effectively reduced, and the detection precision is improved.

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 an ultrasonic guided wave detection method and system for steel-concrete joint surface defects. The method comprises the following steps: S1, selecting an ultrasonic guided wave mode for detection; s2, calibrating an ultrasonic guided wave propagation speed; s3, adopting a twin-crystal probe as an air coupling probe, and rapidly screening defects in a large area by using the twin-crystal probe in a self-transmitting and self-receiving manner; and S4, carrying out quantitative detection on the defects by adopting two air coupling probes in a one-transmitting and one-receiving manner. A cyclic matrix algorithm and a spring model are adopted to calculate ultrasonic guided wave propagation characteristics in a steel-concrete multi-layer plate-shaped structure, an ultrasonic guided wave mode with high steel-concrete joint surface defect recognition sensitivity is selected for detection, and a non-contact air coupling probe is used for scanning imaging. Large-area rapid scanning and local quantitative detection are carried out step by step, efficiency and precision can be taken into account, and efficient and accurate detection of the steel-concrete joint surface defects on the engineering site is achieved.

The present application provides an ultrasonic transducer-based penetration enhancing system and method and belongs to the technical field of ultrasonic introduction. The system comprises: a penetration enhancing housing, a wearing apparatus, at least one air-coupled ultrasonic transducer, and a control system, wherein the wearing apparatus is arranged outside the penetration enhancing housing, each air-coupled ultrasonic transducer is arranged in the penetration enhancing housing and used for emitting ultrasonic waves to a target area, each air-coupled ultrasonic transducer is in a sheet shape, the control system is electrically connected to the penetration enhancing housing and used for sending a control instruction to each air-coupled ultrasonic transducer, and the control instruction is used for instructing each air-coupled ultrasonic transducer to emit ultrasonic waves. The ultrasonic transducer-based penetration enhancing system of the present application improves the safety and penetration effect of ultrasonic-mediated transdermal penetration of drugs.

The invention discloses a double-layer hydrogen storage bottle liner defect detection method and device, and relates to the technical field of ultrasonic flaw detection. The method comprises the following steps: moving an ultrasonic probe from a first stepping window to a second stepping window based on a preset detection path; the ultrasonic probe is an air coupling ultrasonic detection probe; based on the preset detection frequency of the second stepping window, performing air coupling ultrasonic detection on the second detection window by using the ultrasonic probe to obtain detection data; the second detection window is an inner container area detected by the ultrasonic probe at the current moment, and the second detection window corresponds to the second stepping window in position; determining state information of the second detection window based on the detection data; the state information indicates whether the second detection window has defects or not. According to the technical scheme provided by the invention, defect detection can be performed on the double-layer hydrogen storage bottle by utilizing ultrasonic waves.

The invention relates to a defect detection method and device applied to additive manufacturing and electronic equipment. The method comprises the steps that at least one layer of component material is printed on a manufacturing substrate, and multiple layers of component materials are stacked to form a target component; after any layer of component material is printed, defect detection is conducted on the component material on the current manufacturing substrate through air coupling ultrasonic guided waves; after defect detection is performed on a component material on a current manufacturing substrate through air coupling ultrasonic guided waves, at least one layer of component material is printed on the manufacturing substrate. According to the defect detection method, non-contact air coupling ultrasonic guided waves are adopted for defect detection in the additive manufacturing process, on the premise that the components are not damaged and the additive machining environment is not separated, the manufactured components can be detected in real time, the bonding condition between all layers of component materials is evaluated, and the defect detection accuracy is improved. The layering and debonding conditions of component materials are found in time, and the machining quality and the process stability of additive manufacturing are improved.

The invention provides a self-adaptive filtering control method and system and electronic equipment, and relates to the field of ultrasonic data processing, and the method has remarkable advantages in the aspects of self-adaptability, noise recognition and elimination, multi-scale processing, real-time optimization mechanism, hardware acceleration, optimization for the characteristics of ultrasonic data and the like. The noise in the ultrasonic data can be more effectively and accurately removed, important signal characteristics can be reserved, and the method is particularly suitable for the application scene of filtering the ultrasonic data in the air coupling ultrasonic surface density instrument.

The invention provides a hydro-generator ultrahigh frequency partial discharge monitoring analysis method and device and computer equipment, and belongs to the technical field of partial discharge monitoring. The method comprises the following steps: acquiring a partial discharge test signal which is acquired at an acquisition point and is transmitted by a stator winding, injecting the partial discharge test signal into the stator winding from a current injection point, setting an injection point at a head end suspension part of a first bar in the stator winding, and determining the partial discharge test signal at other injection points by considering the influence of air coupling on the signal transmission of the stator winding; selecting from the suspended parts of the head ends of other winding bars; analyzing the acquired partial discharge test signal to obtain a transfer function and a signal attenuation coefficient of a signal transmission path between the injection point and the acquisition point; reconstructing and correcting the obtained partial discharge signal under the actual working condition or the test voltage by using the maximum signal attenuation coefficient and the corresponding transfer function; and performing partial discharge event judgment by using the corrected partial discharge signal. Through the method, quantitative analysis of partial discharge monitoring is realized.

The invention relates to a planar active focusing air coupling ultrasonic transducer, and belongs to the technical field of piezoelectric ultrasonic transducers, and the planar active focusing air coupling ultrasonic transducer is characterized in that a piezoelectric plate and a matching layer are arranged in a shell; the rear cover plate covers the tail end of the shell; the interface is arranged on the shell; a plurality of concentric annular structure electrodes are arranged on the first surface of the piezoelectric plate; the width of each concentric ring in the plurality of concentric ring structure electrodes is gradually increased from outside to inside; a second surface of the piezoelectric plate is provided with a second electrode; and the piezoelectric plate is connected with the interface through leads led out from the plurality of concentric ring-shaped structure electrodes and the whole-surface electrode. According to the plane active focusing air coupling ultrasonic transducer provided by the invention, active focusing of a plane acoustic beam is realized by changing the electrode structure of the piezoelectric plate and arranging a plurality of concentric annular electrode structures on the single surface of the piezoelectric plate, and the plane acoustic impedance matching layer with uniform thickness is matched; and the sensitivity of the focusing air coupling transducer is improved under the condition that the transverse resolution of the transducer is not influenced.

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 invention discloses a non-contact optical coherence elastography endoscope device and a use method. A millimeter-level ultrasonic excitation probe and a laser detection probe device are integrated; a millimeter-level air coupling ultrasonic transducer is adopted to realize lossless and non-contact excitation of sample tissues; the three-dimensional structure and vibration information of the sample are detected and acquired by adopting a high-speed near-infrared swept-frequency laser; an ultrasonic probe and a laser probe device are integrated and packaged by adopting a 3D printing method, so that different application objects can be adapted; according to the non-contact optical coherence elastography endoscope method and device, an off-axis parabolic mirror is adopted to achieve confocal of ultrasonic pulses and excitation detection light beams, non-contact direct excitation and imaging can be achieved through an air medium, use of various coupling agents is avoided, and the non-contact optical coherence elastography endoscope device has the advantages of being simple in structure and easy to machine and integrate a system.

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 an air coupling ultrasonic detection method and device, a storage medium and electronic equipment, and is applied to the technical field of nondestructive detection. An adhesive tape with a preset adhesive tape specification is adhered to the edge of a to-be-detected piece, so that the extension length of the adhesive tape exceeding the edge of the to-be-detected piece reaches a preset threshold value, and the preset adhesive tape specification and the preset threshold value are related to material characteristics of the to-be-detected piece; removing bubbles at the sticking position of the adhesive tape and the to-be-detected piece so that no air layer exists between the adhesive tape and the to-be-detected piece; when air coupling ultrasonic C scanning detection is carried out on a to-be-detected piece, the adhesive tape pasted on the edge of the to-be-detected piece shields the side lobe of the probe, and an air coupling ultrasonic detection result of the to-be-detected piece is obtained. According to the method, the characteristic that air coupling ultrasonic waves are insensitive to the firmly-pasted adhesive tape is utilized, the adhesive tape is firmly pasted to the edge of the to-be-detected piece, and the side lobe of the probe is successfully shielded, so that the edge blind area in air coupling ultrasonic detection is effectively reduced, and the reliability and accuracy of air coupling ultrasonic detection are improved.

The invention discloses a leakage detection method for a composite material component with a cavity based on an air coupling ultrasonic technology, and the method comprises the steps: scanning a to-be-detected component in an atmospheric environment through employing the air coupling ultrasonic technology, so as to obtain a first ultrasonic scanning image; placing the to-be-tested component in an atmosphere filled with inert high-density gas; taking out the to-be-detected component from the atmosphere, and scanning the to-be-detected component again in the atmospheric environment by using the air coupling ultrasonic technology so as to acquire a second ultrasonic scanning image; and comparing the second ultrasonic scanning image with the first ultrasonic scanning image to check whether the second ultrasonic scanning image presents an additional high-attenuation area or not. According to the invention, defect detection and leakage detection of the composite material component with the cavity can be realized in a completely lossless manner in a dry environment, and the leakage detection efficiency is remarkably improved.

The invention relates to an air coupling dual-polarization combined radar antenna and a transceiving method thereof, belongs to the technical field of ground penetrating radar antennas, and solves the problems of low gain and poor air coupling detection effect of a radar antenna in the prior art. According to the invention, four same antenna units are orthogonally combined to form the dual-polarized combined antenna with two transmitting and two receiving; the four antenna units comprise a first transmitting antenna, a first receiving antenna, a second transmitting antenna and a second receiving antenna; the first transmitting antenna and the first receiving antenna are bilaterally symmetrical; and the second transmitting antenna and the second receiving antenna are vertically symmetrical. The radar antenna provided by the invention adopts an air coupling system, is stronger in directivity and higher in efficiency, can couple more energy into a to-be-detected target body, is suitable for air coupling ground penetrating radar application, and is better in detection effect.

The application provides a cotton seed quality online detection method, device, system and storage medium, comprising: in the case that the quality category of the to-be-detected cotton seed is not the first quality category, acquiring an air-coupled ultrasonic signal for detecting the quality of the to-be-detected cotton seed; generating a target image based on the air-coupled ultrasonic signal; inputting the target image into a trained cotton seed quality detection model to output a target quality category of the to-be-detected cotton seed; the trained cotton seed quality detection model is obtained after training according to a target image sample; the target image sample is obtained by acquiring a target image of a cotton seed sample of a second quality category and a target image of a cotton seed sample with an intact epidermis; the epidermis damage degree of the cotton seed of the first quality category is greater than that of the cotton seed of the second quality category. The application can effectively detect slightly damaged cotton seeds, effectively screen intact cotton seeds without damage, and greatly improve the efficiency of cotton seed online sorting.

The application provides a transmitting air-coupled dual-frequency piezoelectric ultrasonic transducer, wherein a low-frequency piezoelectric vibrator is arranged in front, and a high-frequency piezoelectric vibrator is arranged in back, and the ultrasonic transducer specifically comprises a high-frequency matching layer, a low-frequency flexible circuit layer, an insulating layer and a high-frequency piezoelectric vibrator arranged in sequence, the low-frequency piezoelectric vibrator is of a multi-element structure, a cavity is etched on the lower surface of the high-frequency matching layer, the low-frequency piezoelectric vibrator is embedded in the cavity on the lower surface of the high-frequency matching layer and is attached to the low-frequency flexible circuit layer, the insulating layer is used for isolating the electrical signals between the high-frequency piezoelectric vibrator and the low-frequency piezoelectric vibrator, and the low-frequency flexible circuit layer is used for exciting the low-frequency piezoelectric vibrator. The application solves the problem that the longitudinal resolution and the sound energy transmission efficiency cannot be considered simultaneously in the field of air-coupled ultrasonic technology. The application belongs to the field of ultrasonic nondestructive testing technology.

The invention belongs to the field of acoustic measurement, and relates to an ice layer thickness measurement method, in particular to a method for monitoring the ice layer thickness by using air coupling bending waves. A sensor arranged on the ice surface is used for collecting air coupling bending waves propagated in the ice layer; calculating the characteristic frequency of the air coupling bending wave; performing frequency spectrum solving or time-frequency spectrum solving on the air-coupled bending waves collected in the step 1, and determining the characteristic frequency f0 of the air-coupled bending waves. And calculating characteristic frequencies of different ice thicknesses. When different ice layer thicknesses d are set, solving the characteristic equation of the air coupling bending wave to obtain a change function f (d) of the characteristic frequency f of the air coupling bending wave along with the ice layer thicknesses d; according to f0 and f (d), f (d) is made to be equal to f0, and finally the thickness d of the ice layer is obtained. Collection can be performed by using a single sensor, and the method has the characteristics of economy and high efficiency; the activity safety of people on ice can be effectively ensured; finally, the effectiveness of the method is verified through an external field test.

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 utility model relates to the technical field of sound wave skin care equipment, in particular to mask type air coupling ultrasonic infiltration promotion equipment, which comprises a mask body and a wearing structure connected with the mask body, a visible window is arranged on the mask body corresponding to eye sockets, and a plurality of air coupling transducers are arranged on the surface, facing the wearing structure, of the mask body; the edge of the visible window is provided with a supporting body facing the wearing structure, through the supporting body arranged on the edge of the visible window, an air gap is formed between the air coupling transducer and the face of a user in the wearing process of the user, the air coupling transducer acts on the face of the user or a skin care product in a spaced mode, operation is easy and convenient, safety is higher, and the user experience is improved. The percutaneous penetration of the medicine or the skin care product can be realized without tightly attaching the equipment to the skin, the safety and the penetration effect are improved, the applicability is wide, the percutaneous penetration device can adapt to different types of skin care products, and the penetration promotion effect is improved.