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A dual-arc non-penetrating gas baseline focusing air-coupled sensor

A non-penetrating, air-coupled 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: 2018-07-13
苏州广林达电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A dual-arc non-penetrating gas baseline focusing air-coupled sensor
  • A dual-arc non-penetrating gas baseline focusing air-coupled sensor
  • A dual-arc non-penetrating gas baseline focusing air-coupled sensor

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Embodiment Construction

[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, the epoxy resin layer thickness at both ends of the air gap 10 is r=0.5 mm, stent width c=0.2mm.

[0020] Such as figure 1 As shown, the sensor includes a double-arc non-penetrating 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, and a BNC connector 8 Wa...

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Abstract

The invention relates to a non-penetration type gas based line-focus air coupling sensor with double cambered surfaces, and belongs to the technical field of acoustics transducers. The non-penetration type gas based line-focus air coupling sensor with double cambered surfaces is used for converting an electric signal generated by an excitation end into vibration of a piezoelectric material, so that ultrasonic waves are generated; and meanwhile, an acoustic signal reflected back by a measured part is received and converted into the electric signal. A non-penetration type gas based piezoelectric composite material with double cambered surfaces is used as an excitation receiving sensitive element so as to combine with an upper electrode, a lower electrode, a transmission layer, a backing layer, an impedance matching circuit, a metal shell, a BNC joint and the like to form the non-penetration type gas based line-focus air coupling sensor with double cambered surfaces. The sensor has the advantages of low acoustic impedance, high energy transmission efficiency, acoustic energy focus, and the like, and can completely meet experimental needs.

Description

technical field [0001] The invention relates to a double-arc non-penetrating 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 generates ultrasonic waves, and at the same time, it receives the sound wave signal reflected from the device under test 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 agent will m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B06B1/06G01N29/00
CPCB06B1/06B06B2201/40B06B2201/55G01N29/00
Inventor 吕炎李永坤何存富刘秀成焦敬品吴斌
Owner 苏州广林达电子科技有限公司