FENG Hao, ZHANG Zhi-jie, HUANG Xiao-min, ZHANG Jin-wen
(Key Laboratory of Instrumentation Science & Dynamic Measurement (North University of China), Ministry of Education, Taiyuan 030051, China)
Abstract： The theory for measuring the time constant of thermocouple was introduced, and the method for measuring the time constant of NANMAC thermocouple by using dynamic calibration system of transient surface temperature sensor was proposed. In this system, static and dynamic calibrations were conducted for infrared detectors and thermocouples, and then both temperature-time curves were obtained. Since the frequency response of infrared detector is superior to that of calibrated thermocouple, the values measured by infrared detectors are taken as true values. Through dividing the values measured with thermocouples by those with infrared detectors, a normalized curve was obtained, based on which the time constant of thermocouple was measured. With this method, the experiments were carried out with NANMAC thermocouple to obtain its time constant. The results show that the method for measuring the time constant is feasible and the dynamic calibration of thermocouples can be achieved at microsecond and millisecond level. This research has a certain reference value for research and application of NANMAC thermocouple temperature sensor.
Key words： thermocouple; time constant; static calibration; dynamic calibration; normalized curve
CLD number： TH811 Document code： A
Article ID： 1674-8042(2014)04-0001-04 doi： 10.3969/j.issn.1674-8042.2014.04.001
References
[1] HAO Xiao-jian, LI Ke-jie. Traceability dynamic calibration of temperature sensor based on CO2 laser. Acta Armamentaria, 2009: 156-159.
[2] YANG Shu-ping. Time constant measurement of thermocouple by modulated laser. Journal of North University of China, 2007, 28(3): 247-249.
[3] HUANG Liang, HAO Xiao-jian, ZHOU Han-chang. Measurement technique of thermocouple time constant. Sensor World, 2006, 12(9): 16-18.
[4] TENG Shi-lei, KONG Xi-mei. Test system of time constant based on step temperature response. China Measurement & Testing Technology, 2011, 37(1): 25-27.
[5] HAO Li-na, HAO Xiao-jian, ZHOU Han-chang, et al. Measurement on the performance of the CO2 laser applied to dynamic calibration of surface temperature sensor. In: Proceedings of Symposium on Photonics and Optoelectronics (SOPO 2009), Wuhan, China, 2009, 1: 1-3.
[6] LIU Li-shuang, ZHOU Han-chang, HAO Xiao-jian, et al. Test of the dynamic characteristics of temperature sensor based on modulated laser driving method. Information Technology and Applications (IFITA), 2010: 156-158.
[7] FANG Li-de, ZHANG Ji-ke, WANG Nong, et al. Study of dynamic response on characteristics of K-type thermocouple. Electronic Measurement Technology, 2010, 33(11): 18-20.
基于NANMAC热电偶的时间常数测试技术研究
冯浩， 张志杰， 黄晓敏， 张晋文
（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:本文介绍了热电偶时间常数的测试理论， 提出了运用瞬态表面温度传感器动态校准系统实现对NANMAC热电偶时间常数的测试方法。 该系统对红外探测器和热电偶进行了静态校准和动态校准， 得到两者的温度-时间曲线。 由于红外探测器的频率响应优于被校准热电偶的频率响应， 因此， 以红外探测器测得的值作为真值， 用热电偶测得的值与红外探测器测得的值相比得到一条归一化的曲线， 并由归一化曲线求得热电偶的时间常数。 利用该方法对NANMAC热电偶进行时间常数的测试实验， 得到了该热电偶的时间常数。 实验结果表明： 该时间常数测试方法是可行的， 可以实现对微秒、 毫秒量级热电偶的动态校准， 这对于NANMAC热电偶温度传感器的研究和应用具有一定的参考价值。
关键词:热电偶； 时间常数； 静态校准； 动态校准； 归一化
引用格式：FENG Hao, ZHANG Zhi-jie, HUANG Xiao-min, et al. Research on measuring time constant of NANMAC thermocouple. Journal of Measurement Science and Instrumentation, 2014, 5(4): 1-4. [doi: 10.3969/j.issn.1674-8042.2014.04.001]
[full text view]
