A single-arc through-type gas baseline focusing air-coupled sensor
An air-coupled, through-type technology, applied in the field of acoustic transducers, can solve the problems of mismatched acoustic impedance, expensive materials, and difficult processing, and achieve the effects of low acoustic impedance, concentrated acoustic energy, and high energy transmission efficiency.
Active Publication Date: 2018-11-13
BEIJING UNIV OF TECH
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Problems solved by technology
Due to the expensive materials, difficult processing, and the acoustic impedance mismatch between the excitation element and the lens and the acoustic impedance mismatch between the lens and the air in the production of precision acoustic lenses, the energy transmission efficiency is reduced, so the traditional lens Type focus sensors are not suitable for air-coupled ultrasonic testing
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[0020] Attached below Figure 1-7 , taking the sensor with opening angle θ=90° and focusing radius R=20mm as an example to further describe the specific implementation. Here the cross-sectional side length of the selected piezoelectric column 9 is a=1.5mm, and the height h=15mm; the overall cross-sectional side length of the epoxy resin support 11 is s=32.5mm, the edge height f=15mm, and the cylindrical surface length s =32.5mm, rectangular air-gap cross-sectional dimension a×b: 1.5mm×0.5mm, square air-gap cross-sectional dimension b×b: 0.5mm×0.5mm, bracket width c=0.2mm.
[0021] Such as figure 1 As shown, the sensor includes a single arc through-type gas-based piezoelectric composite material 1, an upper electrode 2, a lower electrode 3, an impedance matching layer 4, a backing layer 5, an impedance matching circuit 6, a metal shell 7, a BNC connector 8, etc. . Among them, the core component single-arc through-type gas-based piezoelectric composite material 1 is composed ...
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Abstract
The invention relates to a single-arc-surface through type gas baseline focusing air coupling sensor, belonging to the technical field of acoustic transducers. The sensor has the functions of converting an electric signal generated by an excitation end into vibration of a piezoelectric material to further generate ultrasonic waves, meanwhile, receiving an acoustic signal reflected by a part to be detected and converting the acoustic signal into an electric signal. A single-arc-surface through type gas based piezoelectric composite material is used as an excitation receiving sensitive element, and the single-arc-surface through type gas baseline focusing air coupling sensor is composed of the single-arc-surface through type gas based piezoelectric composite material, an upper electrode, a lower electrode, an impedance matching layer, a back lining layer, an impedance matching circuit, a metal shell, a BNC (Bayonet Nut Connector) and the like; and the sensor has the advantages of low acoustic impedance, high energy transmission efficiency, concentrated acoustic energy and the like and can completely meet experiment requirements.
Description
technical field [0001] The invention relates to a single-arc through-type gas baseline focusing piezoelectric sensor for air-coupled ultrasonic detection, which belongs to the technical field of acoustic transducers, and its function is to convert the electrical signal generated by the excitation end into the vibration of piezoelectric material In turn, ultrasonic waves are generated, and at the same time, the acoustic signal reflected from the device under test is received and converted into an electrical signal. The entire excitation and receiving process adopts air coupling, which realizes the purpose of non-contact detection of the measured material. Background technique [0002] In ultrasonic detection, the method of acoustic wave coupling using coupling medium is dominant, but the use of coupling medium will cause differences in coupling conditions, which will have a great impact on the amplitude and phase of the excitation and received signals, and the coupling agent ...
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IPC IPC(8): G01N29/00
CPCG01N29/00
Inventor 何存富李永坤吕炎刘秀成刘增华吴斌
Owner BEIJING UNIV OF TECH