Device for measuring thermal response time of thermocouple

Abstract

The invention relates to a device for measuring the thermal response time of a thermocouple. The device comprises a large power laser A, a large power laser B, a fixed device, the thermocouple, the data acquisition card, and a computer. The large power laser A and the large power laser B are fixed to the lower part of the fixed device. The thermocouple is fixed to the upper part of the fixed device. The reference end wire of the thermocouple is connected to the input end of the data acquisition card. The output end of the data acquisition card is connected to the computer. The invention relates to the device for measuring the thermal response time of a thermocouple, the thermal response time of the thermocouple is measured through a mode of laser heating, a ladder step temperature is obtained through controlling the starting number of the large power lasers, the device is small and simple, a heating source is easy to control, the operation is facilitated, and manpower is saved.

Description

technical field [0001] The invention relates to the field of instruments and meters, in particular to a device for measuring the thermal response time of thermocouples. Background technique [0002] Thermocouple is one of the widely used temperature sensors in the field of temperature measurement. The dynamic response characteristics of thermocouples refer to the characteristics of thermocouples’ response to temperature step, which can be measured by the thermal response time. The thermal response time of a thermocouple refers to the time τ in which the output change of the thermocouple corresponds to 50% of the temperature step change 0.5 , if necessary, the thermal response time τ for a change of 10% can be recorded additionally 0.1 , and the thermal response time for a 90% change in τ 0.9 . The thermal response time of thermocouple is a very important characteristic parameter in industrial production, and it is an important index to detect the dynamic response charact...

AI Technical Summary

Problems solved by technology

Among the existing measurement methods today, the traditional hot air tunnel method is complicated and expensive, and the experiment cost is relatively large; the rapid input method is also one of the commonly used methods, but the temperature of the constant temperature medium will be destroyed when the thermocouple is quickly put into the constant temperature medium. field, resulting in small temperature fluctuations and certain measurement errors; the problem with the instantaneous electric heating method is that it is impossible to obtain a more accurate temperature step signal; the defect of the shock tube method is that the temperature step platform maintains a short time, which is not enough The output response of the sensor reaches a steady-state value, making it impossible to obtain a reliable thermal response time

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