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An omnibearing broadband flexible dielectric elastic interdigital transducer and a manufacturing method thereof

An interdigital transducer, dielectric elasticity technology, applied in electrical components, impedance networks, etc., can solve the problems of poor mechanical and electrical performance design, narrow frequency bandwidth and signal propagation, not flexible materials, etc., to achieve high elastic performance. Density, strong beam deflection and focusing, the effect of improving the recognition rate

Pending Publication Date: 2019-05-03
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As far as the matrix material of the transducer is concerned, the current piezoelectric ceramic (Piezoelectric, PZT) transducer used to excite the ultrasonic guided wave has the advantages of high piezoelectric strain constant, fast response, and stable performance. It has brittleness and poor designability of electromechanical properties, making it difficult to integrate or paste on the surface of complex shapes and structures, which seriously affects its application range
In addition, baroclinic wedge transducers, comb sensors and electromagnetic acoustic transducers (EMAT) used for guided wave excitation can perform better in offline maintenance and inspection, but because of their large scale, they are not Flexible materials are difficult to integrate into the structure, so they can only be used for offline detection
[0004] In addition, as far as the structural design of the transducer is concerned, the interdigital structure of the interdigital transducer (Interdigital Transducer, IDT) is the most basic form used to generate directional waveguides in the SHM system. However, the prior art There are still many deficiencies in IDT design, such as narrow frequency bandwidth and unidirectionality of signal propagation, etc. In order to adapt to smaller damage detection scales, ingenious transducer structure design is required to increase bandwidth and realize all-round drive and sensing

Method used

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  • An omnibearing broadband flexible dielectric elastic interdigital transducer and a manufacturing method thereof
  • An omnibearing broadband flexible dielectric elastic interdigital transducer and a manufacturing method thereof
  • An omnibearing broadband flexible dielectric elastic interdigital transducer and a manufacturing method thereof

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Embodiment 1

[0040] like figure 1 As shown, an omnidirectional broadband flexible dielectric elastic interdigital transducer according to an embodiment of the present invention includes: a flexible DE substrate 3 and a compliant annular interdigital electrode.

[0041] Specifically, the flexible DE substrate 3 is disc-shaped. The flexible DE substrate 3 in this embodiment is made of acrylic ester, which has good flexibility, so that the transducer can adapt to the surface of irregular and complex structures, and even directly Embedding host structures for damage detection. At the same time, the flexible DE substrate 3 implemented according to the present invention can change the voltage and energy state of the applied charge, and has excellent characteristics such as high elastic density, ultra-short response time, high electromechanical coupling efficiency, and light weight.

[0042] The compliant annular interdigitated electrodes are arranged on the surface of the flexible DE substrate ...

Embodiment 2

[0047] The difference between this embodiment and Embodiment 1 is that: figure 2 As shown, it includes a plurality of compliant annular interdigital electrodes, a control switch 9 and a driver 4, and a plurality of compliant annular interdigital electrodes are centered on the center of the flexible DE substrate 3, and are evenly distributed on the DE substrate 3 along the circumferential direction. On the surface, the distance d between the centers of every two adjacent compliant ring-shaped interdigitated electrodes is larger than the diameter e of the compliant ring-shaped interdigitated electrodes, and does not exceed half the wavelength of the received signal.

[0048] A plurality of compliant annular interdigital electrodes are connected by an integrated circuit, the control switch 9 is connected to the integrated circuit, the driver 4 is connected to the control switch 9, and the driver 4 drives the control switch 9 to control the operation of each compliant annular inte...

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Abstract

The invention provides an omni-directional broadband flexible dielectric elastic interdigital transducer and a manufacturing method thereof. The omni-directional broadband flexible dielectric elasticinterdigital transducer comprises a flexible DE substrate which is disc-shaped; s a flexible annular interdigital electrode arranged on the surface of the flexible DE substrate, wherein flexible annular interdigital electrode includes: a positive electrode interdigital electrode and a negative electrode interdigital electrode, The positive electrode interdigital electrode and the negative electrode interdigital electrode are in a mutually-nested annular interdigital shape, the distance between every two adjacent electrodes in the flexible annular interdigital electrode is gradually increased outwards from the circle center of the flexible annular interdigital electrode in the radial direction, and all-dimensional driving and sensing of ultrasonic signals in a tested component can be achieved; The characteristic of IDT broadband can be realized by changing the electrode spacing, so that the frequency band width has designability, and therefore, guided wave mode selection can be realized, and the recognition rate of effective signals in engineering structure damage detection can be improved.

Description

technical field [0001] The invention relates to the field of electronic devices, in particular to an omnidirectional broadband flexible dielectric elastic interdigital transducer and a manufacturing method. Background technique [0002] Among the methods and related technologies suitable for Structural Health Monitoring (SHM) of large-area panels, many advanced signal processing methods still have many shortcomings such as large human interference factors and narrow application range. Electro-acoustic transducers have gradually become a key component of SHM systems because of their unique function of transmitting structural safety information. The existing Structural Health Monitoring (SHM) system always has the need to further improve its detection sensitivity and accuracy, and to explore the omni-directional transmission and reception, broadband and mode-selectable functions that can be used for large-area composite materials. The flexible interdigitated guided wave trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/02H03H9/125
Inventor 王自平骆英徐晨光袁福国许伯强蒋政轩
Owner JIANGSU UNIV
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