基于压控电流源的铂电阻测温非线性校正设计

铂电阻因其高精度、高稳定性、可重复性以及可互换性的特点, 作为温度传感器在工业领域以及航天领域被广泛应用。针对铂电阻的非线性特性, 提出了一种基于压控电流源的铂电阻测温非线性校正设计方法。利用测量系统的输出值微调铂电阻的激励电流的方法, 抵消非线性误差, 提高输出信号的线性度, 具有参数计算简单、电路实现方便的优点。该方法应用于某在轨辐射定标系统, 进行了相应的电路设计, 采集了实际实验数据。实测数据表明, 采用该方法能在-40~70℃的范围内将由铂电阻温度传感器非线性产生的测量误差改善为约0.016℃, 提高了温度测量精度。

Abstract

As a kind of temperature sensor, the platinum resistance has a wide application in many industrial sectors and fields of aerospace due to its advantage of high accuracy, long-term stability, repeatability and interchangeability. In this paper, a method of nonlinearity correction of platinum resistance is presented based on a voltage-controlled current source. The method is featured in easy circuit design and parameter calculation. It was applied to an onboard radiometric calibration system, and both the corresponding circuit design and laboratory data were presented. It is shown that, the measuring error caused by the nonlinearity is reduced to 0.016℃, within a measuring range of -40~70℃.

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许子颖, 董峰, 傅雨田. 基于压控电流源的铂电阻测温非线性校正设计[J]. 半导体光电, 2020, 41(2): 223. XU Ziying, DONG Feng, FU Yutian. Design of Nonlinearity Correction of Platinum Resistance Temperature Sensor Based on Voltage-controlled Current Source[J]. Semiconductor Optoelectronics, 2020, 41(2): 223.

基于压控电流源的铂电阻测温非线性校正设计

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