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。
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 in- frared detector is better than that of the calibrated thermocouple, the previous measured value is used as a true val- ue to calibrate the latter dynamic calibration system. An ordinary K-type sheathed thermocouple is calibrated dy- namically by the system, a temperature-time curve of the infrared detector and calibrated thermocouple is ob- tained. 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 dynam- ic 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.
出处
《光电技术应用》
2013年第6期77-80,共4页
Electro-Optic Technology Application
基金
山西省回国留学人员科研资助项目(2012-068)
太原市科技局明星专项资助项目(120247-20)
山西省人力资源和社会保障厅留学回国人员科技活动资助项目
关键词
热电偶
动态校准
动态补偿
建模
动态误差
thermocouple
dynamic calibration
dynamic compensation
modeling
dynamic error
