一种基于电涡流和实部互阻抗检测的金属温度监测方法

A new method for metal temperature monitoring based on eddy current and trans-impedance real part measurement

针对粉尘环境下金属温度非接触监测问题,提出了基于电涡流和实部互阻抗检测的温度监测新方法。采用同轴绕制的激励线圈和感应线圈构成温度探头。通过检测激励线圈电流有效值和线圈间的跨有功功率,得到线圈间的实部互阻抗。当线圈参数、安装尺寸、激励频率确定时,实部互阻抗仅与被测金属温度有关,而与激励线圈自身阻抗及其温度系数无关。通过检测实部互阻抗,即可间接监测被测金属的温度,实验结果证明了所提出方法的有效性。

In order to realize non-contact measurement of the metal temperature under the dust environment, this pa- per proposes a new method based on eddy current and trans-impedance real part measurement. The temperature probe is composed of exciting coil and inducing coil, which are coaxial. By testing and handling the current across the excit- ing coil and the trans-active power, the trans-impedance real part can be obtained. When the coil parameters, the in- stalling size and the exciting frequency are determined, the trans-impedance real part has something to do with the temperature of the measured metal, but not the impedance of the exciting coil and the temperature coefficient. It is feasible to measure the temperature of detected metal indirectly by detecting the trans-impedance real part. The experiment results have proved the effectiveness of the proposed method.