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论文类型：期刊论文

发表时间：2011-04-01

发表刊物：ULTRASONICS

收录刊物：Scopus、SCIE、EI、PubMed

卷号：51

期号：3

页面范围：359-368

ISSN号：0041-624X

关键字：Half-wave layer; Liquid; Reflection coefficient; Steady-state; Ultrasonic

摘要：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. (C) 2010 Elsevier B.V. All rights reserved.