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A virtual scanning acoustic microscope and its feature extraction
Author(s): 
Pages: 24-28,9
Year: Issue:  4
Journal: APPLIED ACOUSTICS

Keyword:  声显微镜超声信号处理超高速A/D;
Abstract: 本文描述一台虚拟式扫描声显微镜及应用技术研究.它的硬件特别简单,仅由一台带有超高速A/D卡和快脉冲收发卡的PC机和机械扫描系统组成;主要的功能均由软件完成.脉冲收发卡仅包括脉冲产生和高频放大器;A/D卡采用PCI总线,采样率1GSPS,数据传输率100MB/s.系统能采集并实时显示频率达百兆的未检波回波信号.采集到的信号经软件处理,可在屏幕上实时显示样品的A、B、C型幅度像或相位像.仪器利用信号处理技术提高信号的信噪比;进行特征提取、识别.该仪器在材料识别,电子、光电子器件和焊接质量检测等方面功能较强,具有广阔的开发应用前景.
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