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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
    
High temperature eddy current displacement sensor based on temperature drift compensation
LV Yun-teng, ZHU Chang-sheng
College of Electrical Engineering, Zhejiang University, Hangzhou 310000, China
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Abstract  

A novel high-temperature eddy current displacement sensor operating from 20 ℃ to 500 ℃ was introduced. The application of new materials and structure improvement of the sensor probe promised the adaptation of sensor probe to severe temperature variation. The convention of detected displacement to electric signal was completed by frequency modulation circuit and peak detection circuit. The temperature drift, consisting of output sensitivity and bias voltage, was eliminated by a temperature-compensation circuit added in the output stage of the sensor. Experimental results verified that the designed high-temperature eddy current displacement sensor had good output sensitivity and linearity within temperature variation from 20 ℃ to 500 ℃, with effective temperature drift eliminating properties.

Published: 01 April 2015
CLC:  TP 212  
  TP 391  
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Cite this article:

LV Yun-teng, ZHU Chang-sheng. High temperature eddy current displacement sensor based on temperature drift compensation. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2015, 49(4): 749-753.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2015.04.020     OR     http://www.zjujournals.com/eng/Y2015/V49/I4/749


基于温漂补偿的高温电涡流位移传感器

介绍能够工作于20～500 ℃高温环境下的电涡流位移传感器.通过对传感器探头材料的选择与结构的改进,使传感器探头能够适应环境温度的剧烈变化；利用恒频调幅电路与峰值检测电路,完成位移信号至电压信号的基本转换；通过在传感器输出级加入温度补偿电路,分别针对灵敏度与电压基值进行补偿,实现了对温度影响的有效抑制.在设计的实验硬件系统中对传感器的输出特性进行测量,实验结果验证了该电涡流位移传感器在20～500 ℃的温度环境内具有良好的灵敏度与线性度,并且具有有效的温漂抑制特性.

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