Method for obtaining real temperature of space object by using the ratio of emissivity at different wavelengths

Guo-qiang Wang; Tao Chen; Jian-li Wang

doi:10.1117/12.828694

20 May 2009 Method for obtaining real temperature of space object by using the ratio of emissivity at different wavelengths

Guo-qiang Wang, Tao Chen, Jian-li Wang

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Proceedings Volume 7283, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 728322 (2009) https://doi.org/10.1117/12.828694
Event: AOMATT 2008 - 4th International Symposium on Advanced Optical Manufacturing, 2008, Chengdu, Chengdu, China

Abstract

The infrared radiation character (temperature and efficiency radiation area) of a space object is an important characteristic, we can judge the state of the object working in orbit by measuring temperature and variety. Due to lower temperature of the object and far distance between the object and the earth, the infrared radiation signal is faintness, therefore temperature and the infrared radiation character is difficult to measure. There are several methods to measure the temperature of the object in theory and each one has its applicability respectively, such as applying Wien Law to compute temperature, based on Stefan-Bolzmann law to compute temperature and utilizing multi-spectrum detector to measure temperature As a whole these methods are based on the hypothesis that the object is a Black-body or the radiance emissivity is constant. In fact, homochromatic radiance of object is not a constant but a function that changes with wavelength. Since the problem that an object whose homochromatic radiance is not a constant which results in temperature can not be computed accurately, we bring forward a method to contrast the luminance of the object at different wavelengths and deduce the relationship among homochromatic radiance and wavelength and the temperature of Black-body, from which we can compute real temperature of object.

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Guo-qiang Wang, Tao Chen, and Jian-li Wang "Method for obtaining real temperature of space object by using the ratio of emissivity at different wavelengths", Proc. SPIE 7283, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 728322 (20 May 2009); https://doi.org/10.1117/12.828694

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KEYWORDS

Temperature metrology

Infrared radiation

Atmospheric corrections

Black bodies

Atmospheric sensing

Optical testing

Sensors

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