16 October 2015 Development of new shipborne aureolemeter to measure the intensities of direct and scattered solar radiation on rolling and pitching vessel
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Abstract
New shipborne aureolemeter was developed to improve the sun-tracking performance for accurate measurements of not only direct but also circumsolar radiation, even on a vessel weltering. Sun position is determined by a real-time image processing system with a CCD camera. The accuracy of the sun position determination is finer than 0.01°. The radiometer is tracked the sun under a feedback control with the derived sun position. For a sky radiance distribution measurement, the control target position on the CCD camera image is shifted a pixel corresponding to a measuring scattering angle. In the case of a scattering angle larger than 7°, the radiometer’s tracking is conducted under feed forward control on the basis of the angle of roll and pitch monitored with a gyroscope. The instrument constants were determined from a Langley plot method. Test observation was conducted onboard the Antarctic research vessel (R/V) Shirase during the 56th Japanese Antarctic Research Expedition (JARE-56; 2014-2015). Aerosol optical thickness (AOT) was measured. The measurement of the sky radiance distribution is being analyzed to derive the aerosol optical properties.
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Hiroshi Kobayashi, Hiroshi Kobayashi, Masataka Shiobara, Masataka Shiobara, } "Development of new shipborne aureolemeter to measure the intensities of direct and scattered solar radiation on rolling and pitching vessel", Proc. SPIE 9640, Remote Sensing of Clouds and the Atmosphere XX, 96401A (16 October 2015); doi: 10.1117/12.2195691; https://doi.org/10.1117/12.2195691
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