Interdigital transducer array and manufacturing method

Abstract

The invention discloses an interdigital transducer array and a manufacturing method. The interdigital transducer array comprises a polyvinylidene fluoride base and N trapezoidal interdigital electrodearray elements, the polyvinylidene fluoride base is in a disc shape, and the multiple trapezoidal interdigital electrode array elements are evenly distributed on the surface of the polyvinylidene fluoride base in the circumferential direction with the circle center of the polyvinylidene fluoride base as the center. The positive electrode interdigital electrode of the trapezoidal interdigital electrode array element comprises a positive electrode external connection end and a plurality of positive electrodes which are arranged at intervals, and the negative electrode interdigital electrode ofthe trapezoidal interdigital electrode array element comprises a negative electrode external connection end and a plurality of negative electrodes which are arranged at intervals; a plurality of positive electrodes and a plurality of negative electrodes in each trapezoidal interdigital electrode array element are alternately arranged at intervals; every two adjacent trapezoidal interdigital electrode array elements share one positive electrode external connection end, and every two adjacent trapezoidal interdigital electrode array elements share one negative electrode external connection end.The interdigital transducer array has the advantages of wide frequency band, low loss and multidirectional emission and reception, and improves the damage detection efficiency.

Description

technical field [0001] The invention relates to the technical field of interdigital transducers, in particular to an interdigital transducer array and a manufacturing method. Background technique [0002] Among the methods and related technologies suitable for large-area panel Structural Health Monitoring (SHM), 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. Existing structural health monitoring systems always have the need to further improve their detection sensitivity and accuracy. To explore flexible interdigitated guided wave converters with multi-directional emission and reception, broadband and mode-selectable functions that can be used for large-area composite materials The functional device can solve key technical o...

AI Technical Summary

Problems solved by technology

The existing rectangular IDT has a narrow line width, which cannot meet the repeated stress action of higher and higher frequencies and higher and higher power. Therefore, it is very important to study broadband, low loss, and high performance IDT for structural health monitoring.

However, for the trapezoidal interdigital transducer, it is mainly used for filter design, and it is not yet mature to apply it to damage detection

As far as the structural design of the transducer is concerned, the interdigital structure of the interdigital transducer is the most basic form used to generate directional waveguides in the SHM system. However, there are still many problems in the IDT design in the prior art. Insufficient, such as narrow frequency bandwidth and single directivity, etc.

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