基于ARM的直线式时栅位移传感器A／D转换电路设计

摘要

利用时空转换思想，以时间基准测量空间位移量，设计了基于ARM的直线式时栅传感器A／D转换电路。采用STM32F407VGT6型ARM处理器与AD7298BCPZ型12位A／D转换芯片相结合，利用嵌入式Linux实时操作系统的移植，使得系统具有更好的可靠性与实时性。实验表明：设计的A／D转换电路，最小分辨时间为2.44 ns．能够更好的实现传感器的高速、高分辨率采样，实现了直线式时栅传感器的实时误差修正与补偿，为高精度直线式时栅传感器的研制提供了技术支持。%Based on the theory of time-to-space converting , an A/D conversion circuit using ARM processor for the linear typed time grating sensor was designed to measure displacement by time space .For the high reliability and real-time,ARM proces-sor STM32F40VGT6 and 12 bit A/D chip AD7298BCPZ were used ,and embedded real-time operating system Linux was transplan-ted.Experimental results show that the resolution of the A /D conversion circuit is 2.44ns,and the high speed and resolution of sam-pling is better .It realizes the real-time of correction and compensation for error and provides technical support for high precision lin -ear time-grating sensor .