Acoustic method for obtaining the pressure reflection coefficient using a half-wave layer |
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Authors: | Liu Jia-xin Wang Zhi-qiang Li Guo-feng Wang Ning-hui |
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Affiliation: | Institute of Electrostatics and Special Power, Dalian University of Technology, Dalian 116024, China |
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Abstract: | This paper describes a method for obtaining the pressure reflection coefficient by using a half-wave layer. Two transducers were placed in reference liquid and test liquid respectively. The reference and test liquid were separated by the thin half-wave layer. Both transducers could operate in two modes. One acted as a transmitter and worked in pulse-echo mode, and the other operated in receiver mode. By adjusting the frequency of drive signal according to the thickness and material property of the half-wave layer, it was possible to generate the maximum interference signal of multiple waves reflected at the two interfaces of the layer. Therefore, the amplitude of reflection wave in steady-state depended only on the reflection coefficient at the interface between the half-wave layer and the test liquid. The effects of the signal-to-noise-ratio and the half-wave layer attenuation on the uncertainty characteristics of the pressure reflection coefficient were discussed. The experimental results showed high accuracy for measurement of reflection coefficient. |
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Keywords: | Half-wave layer Liquid Reflection coefficient Steady-state Ultrasonic |
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