Thermal modeling of desert backgrounds in the far-infrared spectral region

Ali Mahmoodi; Abdolreza Nabavi; Mehdi N. Fesharaki

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Thermal modeling of desert backgrounds in the far-infrared spectral region

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摘要

Several thermal models are introduced, based on both a steady-state and a non-steady-state heat balance equation. These are used to predict the surface temperature of dry bare desert background elements. Sensitivity analysis is performed for steady-state models, which indicates that for large measurement error the semiempirical models yield higher accuracy than the physical model. The non-steady-state models take account of variations of the meteorological parameters, and exhibit approximately 47％better performance for rapidly altering weather conditions. Also, the coefficients in these models may be used for a larger period of time to predict the surface temperature. Experimental tests are performed to examine the higher precision of the new models for predicting both the temperature and the thermal image of desert backgrounds. The mean prediction error of the new models is typically more than 25％better. Also, the contrast (variance) of the predicted thermal images is much closer to that of the real images during the daytime.

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《Optical Engineering》 |2000年第9期|2545-2554|共10页
作者
Ali Mahmoodi; Abdolreza Nabavi; Mehdi N. Fesharaki;
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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类光学仪器;
关键词
Infrared background; Thermal image; Desert background; Thermal model; Empirical modeling;

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Thermal modeling of desert backgrounds in the far-infrared spectral region

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