摘要
基于航天工业中温度信号的测量,研制了一种高测量精度的铂电阻温度传感器。设计采用恒流源微电流驱动三线制铂电阻经不平衡电桥获得理想电压,实现了去除自身线阻和减小自热效应;提高了测量精度。通过差分放大电路、反馈电路和压控电压源二阶低通滤波电路有效地改善了铂电阻的线性度,减小外界干扰信号对测量系统的影响。测量结果表明,在-40~60℃的变温环境中测量-20~450℃温度误差小于0.5℃。
A high precision platinum resistance temperature sensor was designed based on aerospace industrial temperature signal＇s measurement.The constant current source driving platinum resistance was designed by wheatstone bridge to obtain the ideal voltage,realizing remove conductor resistance and reduce from thermal effect and improving the measurement accuracy.Through the differential circuit,the feedback circuit and the voltage-controlled second-order low-pass filter circuit,the linearity of platinum resistance was improved and the interfering signal on the system was reduced.According to the test results show that the temperature measurement error of measuring temperature range from-20 ℃ to 450 ℃ in the range-40 ℃ to 60 ℃ environment is less than 0.5 ℃.
出处
《仪表技术与传感器》
CSCD
北大核心
2017年第11期10-13,共4页
Instrument Technique and Sensor
关键词
测量
铂电阻
恒流源
反馈电路
压控电压源二阶低通滤波电路
measurement
platinum resistance
constant current source
feedback circuit
voltage-controlled second-order low-pass filter circuit
