摘要
高频检测信号的采集复原决定了工业超声显微镜检测探伤所能达到的精度。文中介绍了一种基于PCI的8位400MHz采样率高速信号采集系统的设计。其应用AD830构成的差动电路提高了系统共模噪声抑制比和信号的垂直线性;异步并行A/D转换技术采用200MHz采样率A/D转换器件,实现400MHz实时采样率;CPLD编程完成了信号滤波、数据压缩等处理,构成了超声时域信号处理NDT平台。采用该系统的工业超声显微镜可实现50MHz以内高频信号的高精度采集还原,从而满足高精度实时检测探伤的需要。
Detecting precision of industry ultrasonic microscope depends on the precision of sampling signal＇s reversion. This paper presented a system design of 8 bit ,400 MHz high-speed data acquisition system based on PC! bus. The ADS30 module of differential amplifier was an effective noise suppressor,which can accommodate the system to a noisy environment and enhance vertical line of signal. Asynchronous concurrent A/D conversion technique adopted common used 200 MHz A/D chips, reaching a sampiing rate of 400 MHz;CPLD programming realized the process of demodulation and data compress, and constituted NDT platform of ultrasonic signal process. The system can realize the sampling and reverting for 50 MHz high-frequency signal. And the detecting precision is improved.
出处
《仪表技术与传感器》
CSCD
北大核心
2008年第9期50-52,57,共4页
Instrument Technique and Sensor
关键词
差动
A/D转换
异步传输
PCI总线
differential amplifier
A/D conversion
asynchronous transmission
PCI bus
