Study on Variation of Thermal Image by Infrared Radiometer Influenced by Fluctuations of Environmental Factors

Article type: Research Article

Authors: Kamoi, A. | Okamoto, Y.

Affiliations: Grad. School of Science and Arts, University of East Asia, 2-1 Ichinomiya Gakuen-cho, Shimonoseki, Yamaguchi 751-8503, Japan. | 3-7-19 Higashioshima-cho, Hitachinaka, Ibaraki 235-5678, Japan.

Abstract: The infrared radiometer (IR) displays the radiation temperature distribution. Frequently, thermal images on a CRT display fluctuate and those radiation temperatures cannot be measured correctly. Therefore, we are frequently faced with the difficult problem of evaluating the detection limits on surface and internal flaws in construction and underground structures, and so on. Those difficulties are considered to be due to fluctuations of the meteorological and environmental factors, mainly influenced by solar radiation, wind velocity, atmospheric temperature, and so on. Our experimental study clarifies the relation between variations of the thermal images on the CRT of IR display and the environmental factors using an analysis of power spectral density.

Keywords: thermal image, detection limit, environmental factors, fluctuation, power spectral density

Journal: Journal of Visualization, vol. 5, no. 1, pp. 95-103, 2002