Thermal measuring and testing – Calorimetry
Patent
1980-07-14
1982-08-10
Ruehl, Charles A.
Thermal measuring and testing
Calorimetry
374124, G01K 1700
Patent
active
043431828
ABSTRACT:
In a radiation heat loss detector, radiation from an extended surface area is detected with a sensor having a wide field of view closely matching that of an associated camera. By simultaneously photographing the surface area of interest and detecting the radiation from that same area, a clear record is provided for future use. A wide band radiation sensor is used. Compensation for environmental radiation is made by first viewing the environment with the sensor and holding the sensed signal and then subtracting that signal from the flux detected when the sensor faces the extended surface area. The date and time are also recorded on the photograph. A sonar device positioned on the camera provides a distance indication which, with a known field of view, allows for a determination of the total flux from the surface area, a determination of convective heat losses from the surface and a correction for atmospheric absorption of the radiant energy.
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Hsieh & Ellingson, "A Quantitative Determination of Surface Temperatures Using an Infrared Camera", SPIE, vol. 124, Modern Utilization of Infrared Technology III, (1977).
Corr Denis E.
Exergen Corporation
Ruehl Charles A.
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