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Title: A Viable Alternative To Caloriraetry Amvor Chramotography Is Available. It Is The Therm-Titrator, A New Approach To The Determination Of Calorific Vall Of Natural Gasses.
Author: W. Michael Zander
Source: 1982 Measurement Science Conference
Year Published: 1982
Abstract: A copper-constantan circular foil heat flux gage (foil gage) is a sensor which develops an EMF proportional to the heat flux absorbed at its sensing surface. It is used in many applications such as testing plasma jets, monitoring dryer conveyors and evaluating CW laser beam characteristics. A group of such devices was submitted to this laboratory for calibration. The measurement used to determine the constant of proportionality between incident radiant power density and the signal EMF is described. The considerations involved in characterizing these detectors with a carbon dioxide CW laser versus those involved using a high temperature blackbody are discussed. The mounts used to heatsink these foil gages are goldplated and have receiving cones with several types of surface textures and tapers. Some of these mounts give rise to a spectrally dependent sensitivity. This dependence resulted in some significant differences between the blackhody and CD2 results. These differences and their origin are discussed. An estimate of the error in the measurement results is presented.

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