低频宽带超声显微镜的研制

Research and development on a low frequency wideband SAM

叙述了１０～１００ＭＨｚ频段智能化声显微镜的研制工作。声显微镜由声镜、机械部件、电路和微机软硬件组成。由于其工作频率处于早期声显微镜和普通超声之间，无法简单采用已有电路。为此，采用新技术实现了两种电路。并从理论和实验两个方面分析、对比了单脉冲和脉冲调制两种信号源对声镜的激励特性。结果说明，对低频段声显微镜而言，单脉冲方案较佳。其结构简单，成本低，盲区小。应用研究表明，该机适用于多个工业领域，有广阔的应用前景。

The research and development on a 10￣100 MHz scanning acoustic microscope(SAM) are described. Four parts are included: acoustic lens, mechanics I electronic circuitsand microcomputer system. It is necessary to use some new circuit for this SAM. Two sets ofsignal generator are developed. The comparison showed that very short pulser mode is betterthan pulse modulation RF genarator mode in complexity, characteristic and price. Some ofthe testing results are also given. The application of this SAM can be found in some industrial fields.