零点电漂移作为压力传感器特性指标的讨论  

Discussion About The Electric Drift Of The Bridge Offset Output For Pressure Sensor As One Of Performance Parameters

作　　者：孙以材[1] 高振斌[1] 宋青林[1] 孙冰 

机构地区：[1]河北工业大学 [2]天津计量研究所

出　　处：《传感器世界》2002年第4期16-20,31,共6页Sensor World

基　　金：国家自然科学基金资助课题 批准号:69672015

摘　　要：当测定不同压力传感器的特性时,发现均存在零点电漂移现象.本文从理论上分析指出,力敏电桥的零点电漂移起因于桥臂电阻的非线性.后者与扩散电阻的有效导电层宽度随外加电压变化及反向漏电有关.温度在50～60℃以下时,反向漏电的影响可忽略.本文讨论了零点电漂移的影响以及使其抑制的问题,并认为应将它作为一个特性指标.After calibrating a great number of pressure sensors for more than one hundred times ,we found that electric drift of the bridge offset existed all the time. Through the theoretical analysis, this paper points out that it arises from the nonlinearity of piegoresistors related to voltage dependence of the effective conducting width out of the space charge region on p-n junction and the leakage current. Beneath the temperature of 50~60C, the former is the main reason. The influence of electric drift of the offset and its suppression are discussed in this paper and it should be taken as one of performance parameters for pressure sensors.

关 键 词：零点电漂移 特性指标 压力传感器 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]