A coaxial double-arc through-type gas baseline focusing air-coupled sensor
A coaxial double-arc, air-coupling technology, applied in the field of acoustic transducers, can solve the problems of mismatched acoustic impedance, expensive materials, difficult processing, etc., 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 , with the opening angle θ=90°, the focus radius is the radius R of the lower cylindrical surface 2 The sensor of =20mm is an example to further illustrate 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 width of the epoxy resin support 11 is s=32.5mm, the radial height t=20mm, and the cylindrical surface length s =32.5mm, the radius of the upper cylinder is R 1 =35mm, the width of the platform at the edge of the lower cylinder is m=1mm, the length is s=32.5mm; the width of the fan-shaped air gap is d=0.2mm, and e=1.5mm; the width of the bracket is c=0.2mm; adjacent The included angle between the axes of the piezoelectric columns 9 is
[0020] Such as figure 1 As shown, the sensor includes a coaxial double-arc through-type gas-based piezoelectric composite material 1, an upper electrode 2, a lower electrode 3, an impeda...
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Abstract
The invention relates to a coaxial double-arc-surface through-type gas baseline focusing air coupling sensor and belongs to the technical field of acoustic transducers. The sensor functions in converting electric signals generated by an excitation end into vibration of a piezoelectric material to generate ultrasonic waves, receiving acoustic wave signals reflected by a detected member and converting the acoustic signals into electric signals. A coaxial double-arc-surface through-type gas-based piezoelectric composite material is adopted as an excitation receiving sensitive element, and the excitation receiving sensitive element, an upper electrode, a lower electrode, a transmission layer, a backing layer, an impedance matching circuit, a metal shell and a BNC form the coaxial double-arc-surface through-type gas baseline focusing air coupling sensor. The sensor has the advantages of low acoustic impedance, high energy transmission efficiency and centralized acoustic energy and completely can meet experimental needs.
Description
technical field [0001] The invention relates to a coaxial 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 a piezoelectric material The vibration of the device generates ultrasonic waves, and at the same time receives the sound wave signal reflected from the tested part and converts it 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 agen...
Claims
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Login to View More IPC IPC(8): G01N29/24G01N29/34
CPCG01N29/2437G01N29/34
Inventor 何存富李永坤吕炎刘秀成刘增华吴斌
Owner BEIJING UNIV OF TECH