摘要
温度变化时，无线应变采集节点存在温漂误差，这会影响测量精度。造成温漂误差的主要原因是电桥上桥臂电阻温度系数的差别。根据温度与温漂误差的关系，利用实验方法预先测出一些典型温度点的节点温漂误差，再采用三次样条插值算法对测量数据进行修正，实现对无线应变采集节点温漂误差的软件补偿。实验表明：在25-57℃温度范围内，补偿后节点的温漂误差小于＋10×10-6／℃，与补偿前相比误差降低了75％，并且在利用模拟装置测量无缝线路纵向温度力时，测量精度得到显著提高。
When temperature of environment varies, wireless strain acquisition node has temperature drift error which affects its measurement precision. Main reason of temperature drift error is difference between temperature coefficients of bridge arm resistances. According to relationship between temperature drift error and temperature, premeasure node temperature drift error of some typical temperature point by experimental method, cubic spline interpolation algorithm is adopted to correct measurement datas, realize software compensation of temperature drift error of wireless strain acquisition node. Experimental result shows that temperature drift error is less than -10 × 10-6/℃ after compensation,which is reduced by 75 % compared with which is before compensation, within the temperature range of 25 - 57 ℃ , and the measurement precision is also significantly improved while measuring longitudinal temperature force of continuous welded rails by simulation device.
出处
《传感器与微系统》
CSCD
北大核心
2013年第10期27-29,33,共4页
Transducer and Microsystem Technologies
基金
国家"十二五"科技支撑计划资助项目(2011BAG05B02-03
2011BAG05B02-02)
牵引动力国家重点实验室开放课题(TPL1309)
中央高校基本科研业务费专项资金资助项目(DUT12JB08)
关键词
应变采集节点
应变
误差补偿
插值法
软件补偿
strain acquisition node
strain
error compensation
interpolation method
software compensation
