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| Fabrication and study on the Response Characteristics of Micro-thermocouples Using Electrolytic Corrosion Method |
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Abstract Reducing the diameter of the thermocouple’s temperature-sensitive junction is an important method to improve the dynamic response characteristics of the thermocouple, but it is difficult to find finer thermos wires in actual fabrication. In order to further reduce the diameter of the thermos wire, the more stable E-type thermocouple wire(?0.025mm) was selected, and the diameter of the two metal wires was further reduced to about ?0.01 mm by electrolytic corrosion, and a micro-thermocouple with a temperature-sensitive junction size of about 0.02 mm was welded under a digital microscope. The time constants of micro-thermocouples and thermocouple made of 25 um original thermos wires were measured by the temperature step method, and the reliability of the results was analyzed, the time constant of the thermocouple made of 25 um original thermos wires is （30.06?1.16） ms, while the time constant of the micro-thermocouple is （11.62?1.02） ms, so the dynamic response characteristics of this by the method is significantly improved. The experiment also show that, the positive step response time of the micro-thermocouple is smaller than the negative step response time after the thermocouple temperature sensing junction is further reduced, And the uneven composition of the material after wire electrolysis can lead to changes in the thermoelectric potential of the micro-thermocouple.
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Received: 28 December 2023
Published: 19 March 2025
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2025, Vol. 46 
