Mr. Shaofan Tang Profile

Shaofan Tang

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Proceedings Article | 23 January 2023 Paper

Design of near-space infrared dual-channel multi-spectral camera

Hui Gong, Lei Chen, Minlong Lian, Zhichen Shi, Kang Li, Shaofan Tang

Proceedings Volume 12557, 125572R (2023) https://doi.org/10.1117/12.2655699

KEYWORDS: Cameras, Modulation transfer functions, Infrared cameras, Medium wave, Infrared radiation, Sensors, Imaging systems, Distortion, Calibration, Spatial resolution

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The infrared multi-spectral camera on near-space vehicle had the characteristics of high spatial resolution, high time resolution. A new dual-channel infrared multi-spectral remote sensing camera was developed. It included a middle wave (MW) channel (3.7μm~4.8μm) and a long wave (LW) channel (8μμm~12.5μm). The optical system adopted a refract system, a dichroic beam-splitter was utilized to separate LM form MW. The MW and LW channel all had five spectral bands , and filter wheel assemblies were used to split the in-coming MW and LW radiant flux into 5 spectral bands. The optical system aperture was 45mm, and the focal of the two infrared channels were 62.5m. The full field modulation transfer function (MTF) of MW channel was over 0.67, and the MTF of LW was over 0.329. The focal of MW and LW channel had 640×512 pixels, and the pixel size was 25μm. Because of the high integrated design, the total weight of the camera was 18.5kg. The camera would be used to monitor the fire and the forest fires and marine pollution on a airship.

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