Shielded Thermocouples for Gas Turbines

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Abstract
In gas turbines, the gases are normally much hotter than the surrounding walls, so that radiation from a thermocouple in the gas stream to the walls may cause considerable error in observed values of gas temperature. Effective radiation shielding of the measuring junction can be accomplished by pressing a small tubular shield of silver, gold, or platinum directly on an oxidized junction of base-metal thermoelements. The construction, calibration, and performance of junctions with pressed shields of low surface emissivity are described, and the results to date of service tests in gas turbines are discussed. Experimental results on the rate of response of various junctions to sudden changes in temperature, and means for increasing this rate are presented.

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