Experiment And Research On Cold Junction Compensation Of Thermocouple

The thermocouple is the most commonly temperature sensor used in the measurement techniques,its application in the production technology and measurement science used to give rise to an epoch-making change.As the main tool of the modern detection techniques and the instrumentation industry,its accuracy is directly related to the manufacturer and the user's economic interests.Known from the temperature measurement principle of thermocouple,only when the thermocouple cold junction temperature remains unchanged,the thermo emf is the single-valued function of the measured temperature.In the application,the Cold-side exposures to space,the cold junction temperature is easily affected by the fluctuation of the ambient temperature;the cold junction temperature is difficult to hold invariableness,so the thermocouple needs Cold Junction Compensation.The existing s exit a comparatively large error,so this paper proposes an improved based on the existing Cold Junction Compensation method in order to improve the accuracy of measurements and completed the design of the hardware and software of computer compensation method.