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Published on: June 16, 2023
Measurement of acoustic properties for passive-material samples using multichannel inverse filter
Jianlong Li1, Xiaochen Ma1, Suxuan Li1
1College of Information Science & Electronic Engineering, Zhejiang University, Hangzhou, 310027, China jlli@zju.edu.cn, 972888531@qq.com, 330775543@qq.com, fuxiao0316@163.com.
Abstract:
The measurement of acoustic properties for passive-material samples is strongly interfered by reverberations in a limited space. A multichannel inverse filter (MIF) can achieve spatio-temporal focusing by retransmitting the optimal signal estimated from multichannel impulse responses of the transmitter channel and the underwater acoustic channel. To decrease the influence of reverberations on measurements and improve the measurement precision, a MIF is employed to measure the echo reduction and insertion loss, respectively. The method is demonstrated by simulations and experiments, which were performed in a cylindrical tank to measure the two acoustic parameters for a steel plate sample.
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