Method for measuring echo reduction/reflection coefficient of underwater sound passive material based on time reversal focusing
A technology of underwater acoustic passive material and reflection coefficient, which is applied in the direction of analyzing solids by using sound wave/ultrasonic wave/infrasonic wave, which can solve the problems of low measurement accuracy and large measurement error
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[0042] The present invention will be further described below in conjunction with the accompanying drawings.
[0043] refer to Figure 1 to Figure 6 , a method for measuring the echo reduction of underwater acoustic passive materials based on time defocusing, which is used for testing the sound absorption performance of underwater acoustic component materials. The technical scheme of the whole measurement method is as follows:
[0044] 1) When the back-launch signal is generated
[0045] First, depending on the frequency range to be measured, the measurement system generates a transmitted signal, such as a broadband chirp signal or a narrowband pulsed cosine signal. Then, the transmitting-receiving transducer and the sample to be tested are put into the testing environment (water pool / pressure vessel), and the two are as close as possible in distance, such as figure 1 As shown, the transmitting-receiving transducer can be used as a time-reversed PS, and can also be used as a...
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