A double-arc through-type gas baseline focusing air-coupled sensor
An air-coupled, through-type technology, applied in the field of acoustic transducers, can solve problems such as acoustic impedance mismatch, 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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[0019] Attached below Figure 1-6 , taking a sensor with an opening angle θ=90° and a focus radius, that is, a cylinder surface 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.
[0020] Such as figure 1 As shown, the sensor includes double-arc through-type gas-based piezoelectric composite material 1, upper electrode 2, lower electrode 3, impedance matching layer 4, backing layer 5, impedance matching circuit 6, metal shell 7, BNC connector 8, etc. . The core component of the double-arc through-type gas-based piezoelectric composite material 1...
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Abstract
The invention relates to a double-cambered surface through-type gas baseline focusing air couple sensor, which belongs to the technical field of acoustics transducers. According to the invention, an electric signal generated by an excitation terminal is transmitted to vibration of a piezoelectric material to generate supersonic wave, at the same time, a sound wave signal reflected from a part to be detected is received, and then is transmitted to an electrical signal. A double-cambered surface through-type gas-based piezoelectric composite material is taken as an excitation reception sensing element, and is combined with an upper electrode, a lower electrode, a transmission layer, a back sheet, an impedance matching circuit, a metal casing and a BNC joint to the double-cambered surface through-type gas baseline focusing air couple sensor, and the sensor has the advantages of low acoustic impedance, high energy transmission efficiency, and concentrated sound energy which can satisfy the experiment requirement.
Description
technical field [0001] The invention relates to a double-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): G01N29/24G01N29/28
CPCG01N29/2437G01N29/28
Inventor 何存富李永坤吕炎刘秀成刘增华吴斌
Owner BEIJING UNIV OF TECH