基于快速激光恒温区的热电偶时间常数的测量

为了解决热电偶时间常数测试中阶跃温度问题,采用模糊控制算法反馈控制激光器的输出功率,设计了一种新的参量自适应模糊比例-积分-微分控制算法的闭环控制系统,并进行了理论分析和实验验证,测得某K型热电偶的时间常数为421.1ms.结果表明,该算法能有效缩短平衡时间和增强控温系统的抗干扰能力.该结果对热电偶的校准研究是有帮助的,具有一定的工程参考及应用价值.

Measurement method of thermocouple time constant based on fast laser constant temperature zone

In order to solve the step temperature problem during test of thermocouple time constant, fuzzy control algorithm was used to feedback control the laser output power, a new parameter adaptive fuzzy proportion-integration-differentiation control algorithm was implemented and the hardware of closed-loop control system was analyzed. The experimental results show that, the time constant data of K-type thermocouple is 421.1ms. The algorithm can effectively shorten the balance time and enhance the anti-interference ability of the temperature control system. This research is helpful for the calibration research of thermocouples, and has certain engineering reference and application value.