Examination of surface acoustic wave reflections by observing acoustoelectric current generation under pulse modulation

The authors investigate surface acoustic wave (SAW) reflections using the frequency dependence of the acoustoelectric current through a one-dimensional channel. By pulse modulating the transducer power with a short pulse width (0.2 mu s) and matching the pulse repetition period to the delay time of a specific reflection path, the authors detect individual reflected SAW wave packets. Fourier transform results show that reflections from the sample edge behind the transducer and Bragg reflections from the second transducer have the strongest effects. The reflection power coefficients for these are estimated to be approximate to 0.29 and approximate to 0.99, respectively. (c) 2006 American Institute of Physics.

作者利用通过一维通道的声电电流的频率依赖性来研究表面声波（SAW）反射。通过用短脉冲宽度（0.2微秒）对换能器功率进行脉冲调制，并使脉冲重复周期与特定反射路径的延迟时间相匹配，作者检测到了单个反射的表面声波波包。傅里叶变换结果表明，来自换能器后面样品边缘的反射以及来自第二个换能器的布拉格反射影响最强。这些反射的功率系数估计分别约为0.29和约0.99。（c）2006美国物理学会