虚拟式声显微镜及应用技术研究

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，采修订本以的信号经软件处理，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。

A virtual scanning acoustic microscope and its feature extraction

In this article a virtual scanning acoustic microscope and its application of some ultrasonic signal processing methods are mentioned. This acoustic microscope consists of very concise hardware, which includes a mechanical scanning system and a PC with a super high-speed A/D converting card and a fast pulse generating and signal receiving card. The main function of the microscope is fulfilled by software. The fast pulse generating and signal receiving card is made up of two parts: pulse generating and signal amplifying. The A/D converting card, in which the PCI bus technology is used, has a sampling rate over 1GSPS, and its data transmitting rate can reach 100 MB/s. The system can sample and display undemodulated ultrasonic signals up to 100MHz. The undemodulated signal is processed by system software; the real-time C scan of phase or amplitude image is displayed on the screen of PC terminal, as well as its A or B scan. Many modern signal processing methods are used to enhance SNR of the ultrasonic signals in this instrument. Feature extracting is carried out on the basis of real-time analysis of sample echoes. These features are used to recognize and distinguish different materials and flaw types of the tested samples. This new instrument has powerful functions in recognizing film or volume materials and in evaluating the quality of electronic or optoelectronic device and welding quality. So it can be used inmany areas.