电压自校准的高精度多通道应变信号采集模块  

High-precision Multi-channel Strain Signal Acquisition Module with Voltage Self-calibration

作　　者：王浩[1] 王红亮[1] 王铮 林宏 WANG Hao;WANG Hongliang;WANG Zheng;LIN Hong(North University of China,State Key Laboratory of Dynamic Measurement Technology;China Academy of Launch Vehicle Technology;Beijing Institute of Astronautical Systems Engineering)

机构地区：[1]中北大学,省部共建动态测试技术国家重点实验室 [2]中国运载火箭技术研究院 [3]北京宇航系统工程研究所

出　　处：《仪表技术与传感器》2024年第4期24-28,89,共6页Instrument Technique and Sensor

基　　金：山西省“1331工程”重点学科建设计划项目(1331KSC)。

摘　　要：针对现有应变采集设备存在采集精度低、测量范围窄、通道数较少、校准繁琐等问题,设计了一种具备电压自校准的高精度多通道应变信号采集模块,模块以高精度模拟调理转换电路为核心,结合电子线路噪声理论仿真与分析,由自校准电路对采集通道进行校准,通过补偿远端传输线的激励电压,实现了48通道大应变信号与差分电压信号的高精度测量。测试结果表明:应变信号测量范围可达±100000με,测量精度优于0.05%FS;电压信号测量范围可达±15 V,测量精度优于±(0.025%RD+500μV),准确度高,具备较好的稳定性和通用性。In view of the existing problems in the strain acquisition system,such as low acquisition accuracy,narrow measuring range,fewer channels and cumbersome calibration,a high-precision multi-channel strain signal acquisition module with voltage self-calibration was designed.The module was based on the high-precision analog conditioning conversion circuit as the core,combined with the theoretical simulation and analysis of electronic line noise,and the acquisition channel was calibrated by the self-calibration circuit.By compensating the excitation voltage of the remote transmission line,the high precision measurement of 48-channel large strain signal and differential voltage signal was realized.The practical test results show that the measuring range of strain signal can reach±100000με,and the measuring accuracy is better than 0.05%FS.The voltage signal measurement range can reach±15 V,the measurement accuracy is better than±(0.025%RD+500μV),and the accuracy is high,with good stability and versatility.

关 键 词：应变信号采集 自校准 高精度 多通道 补偿远端激励 

分 类 号：TH823[机械工程—仪器科学与技术]