Zhejiang Provincial Key Laboratory of Flow Measurement Technology, China Jiliang University, Hangzhou 310018, China.
Science and Technology on Reliability and Environment Engineering Laboratory, Beijing Institute of Structure and Environment Engineering, Beijing 100076, China.
Sensors (Basel). 2023 Feb 21;23(5):2367. doi: 10.3390/s23052367.
This study investigated the dynamic characteristics of thermocouples by using double-pulse laser excitation for dynamic temperature calibration under extreme conditions. An experimental device was constructed for double-pulse laser calibration; the device uses a digital pulse delay trigger to precisely control the double-pulse laser to achieve sub-microsecond dual temperature excitation with adjustable time intervals. The time constants of thermocouples under single-pulse laser excitation and double-pulse laser excitation were evaluated. In addition, the variation trends of thermocouple time constants under different double-pulse laser time intervals were analyzed. The experimental results indicated that the time constant increases and then decreases with the decrease in the time interval of the double-pulse laser. A method for dynamic temperature calibration was established for the evaluation of the dynamic characteristics of temperature sensors.
本研究采用双脉冲激光激励法研究了热电偶在极端条件下的动态特性，以实现动态温度校准。构建了用于双脉冲激光校准的实验装置；该装置采用数字脉冲延迟触发器精确控制双脉冲激光，实现了具有可调时间间隔的亚微秒双温激励。评估了单脉冲激光激励和双脉冲激光激励下热电偶的时间常数。此外，分析了不同双脉冲激光时间间隔下热电偶时间常数的变化趋势。实验结果表明，时间常数随双脉冲激光时间间隔的减小而先增大后减小。建立了一种动态温度校准方法，用于评估温度传感器的动态特性。
