Design of the Dynamic Calibration System and Dynamic Performance Evaluation Method of Thermocouple
The dynamic characteristics of thermocouple sensors are closely related to their heat transfer mode.Aiming at the dynamic calibration problem of thermocouple sensors,the dynamic characteristics of thermocouples under dif-ferent heat transfer modes are analyzed.The dynamic calibration system is established by using laser,which can real-ize the dynamic calibration under the application environment of thermocouple.The dynamic calibration experiment of a K thermocouple with spherical junction is carried out,and its time constant value is obtained.The method of calculat-ing the working frequency band and estimating the dynamic uncertainty of the sensor are given.The experimental re-sults show that the working frequency band of the thermocouple is 0.163 98 Hz,and the relative dynamic uncertainty is less than 1%.The dynamic calibration system and dynamic performance evaluation method can be improved to be suitable for the dynamic calibration of thermocouples in other convective heat transfer environments.
thermocoupledynamic characteristicsdynamic calibrationtime constantworking frequency band
NETL
NSTL
万方数据
维普
