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 .
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)
关键词
超声测温
高速数据采集
现场可编程门阵列
ultrasonic guided wave temperature measurement
high-speed data acquisition
FPGA
