Making and Testing Small Surface Thermocouples for Fast Response

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Abstract
Using a 200‐J flashtube as a high intensity transient heat source, the response of a surface thermocouple as a function of the size and the type of junction was observed. Very thin surface junctions gave an abnormally high surface temperature during the initial temperature rise. Thick junctions gave a temperature response similar to that of a thermocouple embedded at some depth from the surface. The correlation of the observed surface temperatures to the measured heat flux showed good agreement between the experimental observations and the theoretical predictions.