摘要
探讨了数字式超声探伤仪设计中一种对超声信号进行高速采集技术。根据超声回波信号重复性的特点,利用一只高速A/D(60MHz)转换芯片在N组特定时序信号的控制下对超声回波信号进行采集,并在CPLD(复杂可编程逻辑器件)的控制下实现高速数据缓冲存储,再利用相位合成技术对转换后的N组数据进行数据合成与波形重建,从而实现了数倍于A/D转换芯片速率的高速数据采集,达到等效A/D转换速率N×60MHz。该方案成本低,可靠性高,尤其适合于高速、高准确度的超声无损检测系统中。
A high rate sampling technique for ultrasonic signal in the design of digital ultrasonic inspecting instrument is discussed.Based on the repetition character of the ultrasonic signal,only one high rate analogtodigital converter (60?MHz) controlled by N specialized signals is used to sample the ultrasound signal.The high rate data buffering storage is realized under the control of the CPLD (complex programmable logic device). At last, phase synthesizing technique is used to synthesize the data and rebuild the waveform with the N group of data.A several times higher rate sampling (N×60?MHz) than that of the single A/D is obtained. The design has low cost, high reliability, and it is especially suitable for the high speed and high accuracy ultrasonic nondestructive testing system.
出处
《传感器技术》
CSCD
北大核心
2003年第10期16-18,21,共4页
Journal of Transducer Technology
基金
清华大学"985"重点基金资助项目(012 081100501)
