Abstract
Using a solar radiometer is an effective approach for improving the remote sensing of solar irradiance distribution and atmospheric composition. Long-term development of a solar scanning radiometer enables frequent and reliable measurement of atmospheric parameters such as the water vapor column and aerosol optical properties. However, the discrete wavelength radiometer has encountered a bottleneck with respect to its insufficient spectral resolution and limited observation waveband, and it has been unable to satisfy the needs of refined and intelligent on-site experiments. This study proposes a solar-skylight spectroradiometer for obtaining visible and near-IR fine spectrum with two types of measurement: direct-sun irradiance and diffuse-sky radiance. The instrument adopts distributed control architecture composed of the ARM-Linux embedded platform and sensor networks. The detailed design of the measuring light-path, two-axis turntable, and master control system will be addressed in this study. To determine all coefficients needed to convert instrument outputs to physical quantities, integrating sphere and Langley extrapolation methods are introduced for diffuse-sky and direct-sun calibration, respectively. Finally, the agreement of experimental results between spectroradiometers and measuring benchmarks (DTF sun-photometer, microwave radiometer, and Combined Atmospheric Radiative Transfer simulation) verifies the feasibility of the spectroradiometer system, and the radiation information of feature wavelengths can be used to retrieve the characteristics of atmospheric optics.
Highlights
Since solar energy is selectively absorbed and scattered by atmospheric molecules in transmission, the radiation distribution on the ground characterizes many atmospheric optics properties [1]
This paper proposes a scheme for developing a solar-skylight spectroradiometer with wideband observation of 380~1100 nm
Through the deep integration between hardware and software resources, the embedded Linux integrated with the communication protocol family can control sensor networks and perform data analysis
Summary
Since solar energy is selectively absorbed and scattered by atmospheric molecules in transmission, the radiation distribution on the ground characterizes many atmospheric optics properties [1]. The “Fengyun” meteorological satellites of aerospace engineering provide support for the development of spectroradiometers with a spectral range of 400~1050 nm, with the prospect to obtain refined solar radiation distributions for meteorological modeling and ecological research [12,13]. An improved spectroradiometer system based on embedded ARM-Linux is developed in this study, which simultaneously measures the visible and near-IR spectrum in the whole sky. The solar-skylight spectroradiometer can observe the wideband solar spectrum range of 380~1100 nm, with spectral resolution of 0.1 nm This instrument integrates two types of sun-photometric measurement: direct-sun irradiance and diffuse-sky radiance. The measuring probe can rotate in two orthogonal dimensions of horizontal axis and pitch axis to realize steady and accurate tracking of the target in the whole sky, while observing the solar spectrum from visible to near-IR.
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