LI Bing-shang1, SHI Jian-li1, WU Fei2, et al. R/T mathematic model of NTC thermistor for wide-temperature-range measuring[J]. 2012, 31(6): 53-55. DOI: 10.13873/j.1000-97872012.06.015.
宽温范围测量时NTC热敏电阻器R/T数学模型
摘要
NTC型热敏电阻器使用寿命长
具有很高的灵敏度
进行宽温度范围测量而又要求较高的精度时
R/T的非线性数学模型难以描述。基于最小二乘法的多项式逼近原理
以LNTT502FW热敏电阻器为实例
分段拟合出传感器在(-20~80℃)使用环境下的数学模型
拟和数据相对误差较小
能满足测量要求。
Abstract
NTC thermistor has long life and high sensitivity.When wide-temperature-range measuring with high precision
it is hard to be described by the nonlinear mathematic model of R/T.Based on the principles of polynomical approximation of least square method
a piecewise fitting mathematic model of thermistor LNTT502FW is approached.And it meets the measurement requirements well with small relative data-fitting error.