Abstract
During thermovision measurements, it is necessary to know the radiative temperature of surroundings of the tested object. For objects exposed to an open atmospheric space, such as buildings, the surroundings consists of the ground and the sky. The article concerns the measurement of sky temperature using an infrared camera with a long-wave spectral range of operation. This temperature is needed for the thermovision measurement of the real temperature of walls or roofs of buildings. It is also useful for calculating the emission of the sky over the entire spectral range, what is useful during the radiation heat exchange calculations. The use of an infrared camera for this purpose is a very convenient method, as the thermographer has this device at his disposal when performing object diagnostics. However, this measurement result is exposed to a systematic inaccuracy resulting from the radiation distribution of atmosphere inside the atmospheric window and the shape of infrared camera detector and lens technical characteristics. In addition, there is often a problem with measuring the relatively low temperature of the sky. The work contains an analysis and a proposal of the aforementioned problems solution.
Published Version
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