Evaluation method for horizontal infrared atmospheric spectrum transmittance

Abstract

The invention discloses a measurement method for horizontal infrared atmospheric spectrum transmittance, which can realize measurement of the horizontal infrared atmospheric spectrum transmittance atany distance. The measurement of close-distance horizontal infrared atmospheric spectrum transmittance adopts a field direct measurement method, i.e., an infrared radiation target plate is moved undera visual field condition that the infrared radiation target plate is filled with an infrared spectroradiometer; an infrared radiation signal of the infrared radiation target plate under a testing distance measured by the infrared spectroradiometer is acquired, and the value of the radiation signal is compared with the value of a zero-distance acquired infrared radiation signal, so that the horizontal infrared atmospheric spectrum transmittance value of the distance is obtained; an actual measurement method is only suitable for a limited long distance due to influences of a measurement instrument, signal-to-noise ratio and the like; in order to realize the evaluation of long-distance horizontal infrared atmospheric spectrum transmittance, atmospheric spectrum transmittance values of a plurality of measurement points are measured through the measurement method of the close-distance horizontal infrared atmospheric spectrum transmittance, and data is subjected to exponential function fitting, so that the evaluation of the long-distance horizontal infrared atmospheric spectrum transmittance is realized.

Description

technical field [0001] The invention relates to an evaluation method of horizontal infrared atmospheric spectral transmittance, in particular to an evaluation method of atmospheric spectral transmittance of two infrared atmospheric windows with arbitrary horizontal distances (3-5) um and (8-12) um. Background technique [0002] The infrared atmospheric spectral transmittance refers to the ratio of the infrared radiation emitted by the target, the infrared radiation after atmospheric attenuation to the incident radiation energy. Infrared atmospheric spectral transmittance is mainly used in infrared remote sensing, infrared detection and infrared stealth technology. Since the atmosphere contains a large amount of water, carbon dioxide and other substances, which have an absorption effect on infrared radiation, when the infrared detector is used to detect the infrared radiation of the target, the radiation of the target will attenuate. The longer the distance, the greater the r...

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Problems solved by technology

[0006] Aiming at the shortcomings of relatively large errors in the evaluation process of horizontal atmospheric spectral transmittance by using software simulation calculation methods at present, the present invention proposes two methods (3-5) um and (8-12) um at any horizontal distance. The horizontal infrare...

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