研究目的
To construct a dynamic calibration system for thermocouples using a high power laser to generate pulse temperature excitation, and to analyze the dynamic characteristics of the thermocouple.
研究成果
The dynamic calibration system of the thermocouple was built by using high power laser. The laser beam homogenization system based on microlens array was studied and added to the dynamic calibration system. The homogenization system has low requirement for the shape and power distribution of laser beam. It has better homogenization effect, and the non-uniformity of laser spot is about 0.093. A K-type thermocouple was calibrated dynamically, and its dynamic model was obtained by the system identification method. The model uncertainty and the dynamic characteristics of the thermocouple were analyzed.
研究不足
The dynamic characteristics of thermocouples are closely related to the heat transfer environment. The dynamic calibration system of the thermocouple based on laser can obtain the thermocouple dynamic characteristics under heat conduction mode. In order to study the dynamic characteristics of the thermocouple in different heat transfer environments, the dynamic calibration systems with different heat transfer modes should be studied.
1：Experimental Design and Method Selection
A dynamic calibration system for the thermocouple was built using a high power laser to generate pulse temperature excitation. The laser beam homogenization system based on microlens array was studied and added to the dynamic calibration system to realize uniform heating.
2：Sample Selection and Data Sources
A K-type butt-welded thermocouple was dynamically calibrated by using the dynamic calibration system.
3：List of Experimental Equipment and Materials
RFL-A500D continuous semiconductor laser, IGA 740-LO thermometer, NI PXIe-1071 chassis, NI PXI-5105 digitizers, microlens array, Fourier lens, collimating lens.
4：Experimental Procedures and Operational Workflow
The laser was used to irradiate the thermocouple junction, and the surface temperature of the thermocouple was measured by infrared thermometer. The output signal of the calibrated thermocouple and the output signal of the infrared thermometer were synchronously collected by the data acquisition and processing device.
5：Data Analysis Methods
The dynamic mathematical model of the thermocouple was obtained by the system identification method, and the dynamic characteristics of the thermocouple were analyzed.
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