电涡流传感器探头线圈交流电阻受温度影响  

Influence of temperature on alternating current resistance of probe coil of eddy current sensor

作　　者：罗茹丹 吴峻[1] 李中秀 LUO Ru-dan, WU Jun, LI Zhong-xiu(College of Intelligent Science, National University of Defense Technology, Changsha 410073, China)

机构地区：[1]国防科技大学智能科学学院,湖南长沙410073

出　　处：《传感器与微系统》2018年第9期12-14,18,共4页Transducer and Microsystem Technologies

基　　金：国家重点研发计划资助项目(2016YFB1200600)

摘　　要：电涡流式传感器探头线圈阻抗值不仅可以反映传感器探头线圈到被测导体的距离,阻抗的实部—交流(AC)电阻值实际还会受环境温度的变化而发生波动,因此,消除交流电阻值的温度影响是电涡流传感器实际应用的重点。以高频反射式电涡流传感器为研究对象,根据其特性建立一种简化的多变压器模型对交流电阻值进行计算,探讨了由于线圈与被测导体之间存在磁性耦合关系,被测导体受温度影响而对交流电阻值产生的影响,并利用Maxwell涡流场建立线圈仿真模型仿真验证。Impedance value of probe coil of eddy current sensor not only can reflect the distance from the sensor probe coil to conductor under test,but also the alternating current（ AC） resistance actually fluctuates due to changes in the ambient temperature,so eliminating the temperature effect of the AC resistance is the focus of practical application of the eddy current sensor. Taking the high-frequency reflective eddy current sensor as the research object,a simplified multi-transformer model is established based on its characteristics to calculate the AC resistance and the influence of what measured conductor is affected by temperature affecting the AC resistance is discusseded based on the existence of magnetic coupling relationship between the coil and the measured conductor. Simulation is verified by setting up simulation model using Maxwell eddy current field.

关 键 词：电涡流传感器 高频反射式 交流电阻值 线圈 温度影响 多变压器模型 

分 类 号：TP212.13[自动化与计算机技术—检测技术与自动化装置]