一种多通道高精度数字化传感器变换装置设计

摘要

针对现有传感器变换装置受误差及温漂等因素影响造成采集精度不高的问题，专门设计了一种传感器变换装置；该变换装置具有小型化、低成本、高性能的特点；采用C8051F系列单片机作为主控芯片；为了满足8通道双极性模拟信号采集的要求，采用2片AD公司的14位、6通道A／D芯片对±10 V范围的双极模拟信号进行变换；采用前端信号放大电路、跟随滤波处理电路及微处理器的软件进行线性补偿，达到高精度变换要求；采用RS－422专用芯片完成信号的数字化传输；实验结果表明该变换装置的变换精度能达到0．05％，数字信号传输稳定，可广泛应用于军事和工业生产领域的高精度测量场合。%Designed a novel sensor transform device for the existing sensor transform devices are susceptible to accidental error and tem-preature drift or other factor which caused the acquisition accuracy is not high.This deviec has the characteristics of miniaturization,low cost and high performance.Using C8051F series MCU as the main control chip,in order to meet the requirements of 8 channel bipolar analog sig-nal acquisition,moreover taking 2 pieces 14 bit 6 channel A/D chip of AD company for transform bipolar analog signal of the range of ±10 V.Adopting the front-end siginal amplification and following filter processing circuit with software of the microprocessor to linear com-pensation for the requirements of high precision transformation.Taking the RS-422 chip and assembly language complete the signal digital transmission,with adjustable power conversion chip and achived through high precision resistance regulator for precision power supply re-quirements of the angular can reach 0.05%,at the same time the digital signal transmission is stable which can be widely used in military and industrial production in the field of high precision measurement.