Acoustic emission sensor based on antireflection design and preparation method thereof

By designing an acoustic emission sensor with a matching layer, multiple transition layers, and an anti-reflection layer, the problem of signal distortion during sound wave transmission was solved, achieving stable transmission and efficient signal transmission over a wider frequency range.

CN119375363BActive Publication Date: 2025-11-07BEIJING TONGTAI HENGSHENG TECH CO LTD
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Patent Information

Application Number
CN202411500346.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-10-25
Publication Date
2025-11-07
Estimated Expiration
2044-10-25

AI Technical Summary

Technical Problem

Existing acoustic emission sensors suffer from signal distortion and increased noise during the transmission of sound waves from the matching layer to the piezoelectric element, resulting in reduced signal transmission efficiency.

Method used

An acoustic emission sensor employing an anti-reflection design includes a matching layer, multiple transition layers, and an anti-reflection layer. By designing a multi-layer transition layer structure and an anti-reflection layer thickness that is one-quarter of the sound wave wavelength, effective transmission of sound waves is achieved in different frequency ranges, and reflection is reduced through destructive interference.

Benefits of technology

Stable sound wave transmission was achieved over a wider frequency range, improving signal transmission efficiency, reducing reflections, and enhancing signal strength.

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Abstract

The application belongs to the technical field of acoustic emission sensor devices, and particularly relates to an acoustic emission sensor based on an anti-reflection design and a preparation method thereof. The acoustic emission sensor comprises a matching layer, a multilayer transition layer, an anti-reflection layer and a piezoelectric element. The multilayer transition layer comprises a plurality of transition sub-layers arranged in a stack. The plurality of transition sub-layers have a plurality of acoustic impedances. The thickness of the anti-reflection layer is one fourth of the wavelength of the typical longitudinal wave speed of the acoustic wave signal of the center frequency of the acoustic emission sensor in the anti-reflection layer. By designing the multilayer transition layer structure with different acoustic characteristics, good acoustic wave transmission can be achieved in a wider frequency range, and stable transmission of the target frequency is ensured. Furthermore, based on the quarter wavelength principle, the waves reflected on the surface of the anti-reflection layer can produce destructive interference, thereby reducing the reflection of the acoustic wave and significantly improving the signal transmission efficiency in the frequency range near the center frequency.
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