光电技术应用, 2013, 28 (6): 77, 网络出版: 2013-12-05  

热电偶动态校准及动态补偿技术研究

Research on Technology of Dynamic Calibration and Compensation of Thermocouple
杨宇 1,2郝晓剑 1,2周汉昌 1,2
作者单位
1 中北大学电子测试技术国家重点实验室,山西 太原 030051
2 中北大学仪器科学与动态测试教育部重点实验室,山西 太原 030051
摘要
介绍了利用大功率半导体激光器发出的脉冲激光作为激励源,使被校准热电偶表面产生温升,用响应速度快的红外探测器和对被校准热电偶同时对此温度变化信号进行探测,由于红外探测器的频率响应优于被校准热电偶频率响应,因此,以前者测得的值作为真值来校准后者的动态校准系统。利用该系统对普通K型铠装热电偶进行了动态校准,得到红外探测器和被校准热电偶温度-时间的曲线。热电偶补偿环节采用动态补偿滤波器进行建模,由测得的数据曲线来确定滤波器的阶次和参数,从而确立模型结构,并利用交叉检验法检验模型的正确性。试验表明: 通过动态补偿模型减小了热电偶的动态误差,使之更接近于实际值,并给出了普通K型铠装热电偶补偿曲线。
Abstract
Pulse laser emitted by a high power semiconductor laser is used as an exciting source to make the temperature rise on the surface of the calibrated thermocouple. The temperature change signals are detected by a fast-response infrared detector and the calibrated thermocouple simultaneously. The frequency response of the infrared detector is better than that of the calibrated thermocouple, the previous measured value is used as a true value to calibrate the latter dynamic calibration system. An ordinary K-type sheathed thermocouple is calibrated dynamically by the system, a temperature-time curve of the infrared detector and calibrated thermocouple is obtained. The thermocouple’s dynamic compensation is modeled with a dynamic compensation filter, the order and parameters of the filter are determined based on the measured digital curves and the model structure is defined. The correctness of the model is examined by cross-validation method. Experimental results show that the dynamic error of the thermocouple is reduced by means of the dynamic compensation model, which brings it closer to the actual value, and the ordinary K-type sheathed thermocouple compensation curve is given.

杨宇, 郝晓剑, 周汉昌. 热电偶动态校准及动态补偿技术研究[J]. 光电技术应用, 2013, 28(6): 77. YANG Yu, HAO Xiao-jian, ZHOU Han-chang. Research on Technology of Dynamic Calibration and Compensation of Thermocouple[J]. Electro-Optic Technology Application, 2013, 28(6): 77.

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