Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1980-05-19
1982-10-26
Swisher, S. Clement
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
G01K 116
Patent
active
043559093
ABSTRACT:
A method and apparatus for measuring the temperature of hot fluids (1) in environments involving thermal radiation. The apparatus comprises at least one radiation-protected measuring body (4) constituting one end of a heat-tube (2) having a working temperature below the fluid (1) temperaure to be measured. The other end of the heat-tube (10) is connected to one end of a heat-conducting rod (8); the other end of which is kept cool by cooling means (11). The apparatus is equipped with temperature measuring means (12, 14) for measuring the temperature of the heat-tube as well as the temperature at two points along the heat-conducting rod. There can be more than one measuring body.
The method comprises: (1) protecting the measuring body against heat transfer by radiation; (2) measuring heat emission to a radiation-protected measuring body; (3) maintaining the radiation-protected measuring body at a substantially constant temperature which is below the temperature of the hot fluid; (4) measuring the temperature of the radiation-protected measuring body; and (5) calculating the temperature of the hot fluid by: (a) dividing the heat emission by the product of the heat transfer coefficient of the heat transfer between the hot fluid and the radiation-protected measuring body by the surface area of the measuring body, and then, (b) adding to that value the temperature of the measuring body. It is unnecessary to heat the measuring body to the temperature of the hot fluid. The method can be applied to measuring the temperature of gases in kilns.
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Braun, Temperaturemessung mit kleiner Versugszeit etc., ATM Messtechnishe Praxis, vol. 476, Sep. 75, pp. R137-140.
F. L. Smidth & Co.
Swisher S. Clement
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