热敏电阻在航天器应用的线性化研究  

Research of Thermistor Linearization in Spacecraft Application

作　　者：杨素君[1] 张强 吴显林 曹剑峰[1] 孙家林 YANG Sujun;ZHANG Qiang;WU Xianlin;CAO Jianfeng;SUN Jialin(Beijing Key Laboratory of Space Thermal Control Technology,Beijing Institute of Spacecraft System Engineering,Beijing 100094,China;Shandong Institute of Space Electronic Technology,Yantai,Shandong 264670,China)

机构地区：[1]北京空间飞行器总体设计部空间热控技术北京市重点实验室,北京100094 [2]山东航天电子技术研究所,山东烟台264670

出　　处：《航天器工程》2023年第4期65-70,共6页Spacecraft Engineering

摘　　要：针对航天器上常用的热敏电阻半桥测量电路,文章研究了负温度系数热敏电阻的分压-温度(U-t)曲线拐点,并发现在拐点附近有较宽的线性区间,且不同上拉电阻取值时对U-t曲线线性区间宽度有影响,上拉电阻越小,U-t曲线的线性区间越宽,线性区越向高温区移动。通过理论推导给出了最优上拉电阻公式,应用在某航天器0~20℃范围测量中,线性拟合后的残差小于0.1℃。同时研究比较了常用热敏电阻全测量范围内的一次线性拟合和三次多项式拟合,三次多项式拟合残差小于1℃的温度范围为-36~+68℃,基本涵盖全温度范围,温度跨度是同样残差条件下的一次线性拟合跨度的2倍。Regarding the commonly used half-bridge thermistors measurement circuit on spacecraft,the inflexion point of the thermistors’voltage-temperature(U-t)curve with negative temperature coefficient is studied in this paper,and it is found that there is a good linearity near the inflexion point,the width of U-t curve linear interval is affected by different values of pull-up resistance.The smaller the pull-up resistance,the wider the linear interval of U-t curve,and the linear region moves towards the high temperature region.The optimal pull-up resistance formula is derived theoretically,and applied to a certain spacecraft measurement in the range of 0~20℃.The residual error after linear fitting is less than 0.1℃.At the same time,the first-order linear fitting and the cubic polynomial fitting in the whole measuring range of thermistor are studied and compared.The temperature range of the cubic polynomial fitting is-36~+68℃when the residual error is less than 1℃,which basically covers the entire temperature range.The temperature span is twice that of first-order linear fitting under the same residual condition.

关 键 词：负温度系数 热敏电阻 航天器 测温 线性化 

分 类 号：TK311[动力工程及工程热物理—热能工程]