激光技术2018，Vol.42Issue(2)：192-195,4.DOI:10.7510/jgjs.issn.1001-3806.2018.02.010
热电偶时间常数测试中阶跃温升信号的研究
Study on step temperature rise signal in thermocouple time constant test
摘要
Abstract
In order to accurately test the thermocouple time constant,a high power semiconductor laser with rise time of 5μs and power of 500W was used as excitation source to heat the thermocouple. Theoretical analysis and experimental verification were carries out about time constant. Because of continuous output of semiconductor laser and stable uniformity of spot energy, the restriction of traditional excitation source mechanism of the formal test system was solved. The results show that,as the output power of semiconductor laser is constant, by closed-loop feedback control of laser power, laser step temperature rise signal is generated to ensure the uniform heating of thermocouple and obtain expected equilibrium temperature. Time constants of four different thermocouples were 2.806s, 3.094s, 2.229s and 2.457s. The feedback controller has strong robustness. The test system can stimulate the ideal step temperature rise signal to provide high quality excitation source for thermocouple time constant test.关键词
传感器技术/时间常数/反馈控制/阶跃温升信号/激光激励源Key words
sensor technique/time constant/feedback control/step temperature rise signal/laser excitation source分类
信息技术与安全科学引用本文复制引用
段向港,郝晓剑..热电偶时间常数测试中阶跃温升信号的研究[J].激光技术,2018,42(2):192-195,4.基金项目
国防技术基础"十二五"科研资助项目(JSJC2013408C009) （JSJC2013408C009）
国家自然科学基金资助项目(61473267) （61473267）
