用于超声导波测温技术的数据采集系统设计  

Design of a data acquisition system for ultrasonic guided-wave temperature measurement

作　　者：郭亚飞[1] 王高[1] 梁海坚 康宇晨 王艳红[1] 

机构地区：[1]中北大学电子测试技术国防重点实验室,仪器科学与动态测试教育部重点实验室,山西太原030051

出　　处：《传感器世界》2016年第1期33-37,共5页Sensor World

基　　金：国家自然科学基金资助项目(NO.11304289)

摘　　要：探讨了在超声导波温度测量中一种对超声回波信号进行高速采集的技术。系统采用了两块高速A/D转换芯片在不同的时钟相位条件下,对单个超声回波信号进行采集。在USB芯片读取FPGA片上FIFO中存储的数据时,对两个FIFO中的数据读出进行乒乓操作,从而实现了两倍于A/D转换芯片速率的高速数据采集。该系统由上位机设置采样频率等不同的参数,并传递给FPGA以控制数据采集时序,这样设计极大地提高了系统的灵活性和适应性。该方案尤其适合于高速、高精确度的超声导波测温技术中。A high speed data acquisition technology for ultrasonic echo signals in ultrasonic guided wave temperature measurement is discussed in this paper. The system adopts two high speed analog-to-digital converters controlled by two clocks with different phases to collect single ultrasonic signal. When USB chip reads the data stored in FIFO, the data are readout with Ping-Pong operations, and then high speed data acquisition with two times the rate of A/D conversion is realized. Control parameters of the system such as sampling frequency are set by PC according to different testing conditions, and transferred to FPGA to control the data acquisition sequence, and then the flexibility and adaptability of the system are improved greatly. The scheme is especially suitable for ultrasonic guided wave temperature measurement with high speed and high accuracy .

关 键 词：超声测温 高速数据采集 现场可编程门阵列 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]