【摘要】 NTC热敏电阻的阻值随温度升高而降低,阻值与温度呈非线性变化关系,在实际应用中通常需要进行逐只标定以确定阻温特性。本文以航天热试验用MF501型热敏电阻器为例,介绍了一种简易有效的标定及数据处理方法,通过拟合残差、平均误差、传递误差对标定方法进行评估。结果表明,在使用温度范围内,该方法只需标定3个点,就可以使标定误差控制在0.45℃以内,完全满足使用精度要求。随着适当增加标定点,标定精度还可以进一步提高。更多还原

【Abstract】 The resistance of NTC thermistors is decrease with the increase of temperature,and they generally have nonlinear resistance(R)-temperature(T) behavior.In practice,such thermistor sensor needs to be individually calibrated over the operating temperature range to ascertain the R-T characteristics.The MF501 thermistor applied in spacecraft thermal test was illustrated in this paper to introduce a simple and effective calibration and data processing method.The fitting residual,average error and function transfer error were selected to assess the adequateness of the method.The result showed that the calibration error could be controlled within 0.45 ℃ based on three-point calibration over the operating temperature range and the precision was fully satisfied.Calibration precision could be improved with increasing the calculated calibration points.更多还原