Self-calibration of solar spectral irradiance-meter

For high accuracy observation of atmosphere radiation characteristics about the ground calibration of satellite remote sensor, a solar irradiance spectraradiometer that can realize high accuracy measurement has been developed. Considering the attenuation and loss of the instrument when worked in the field, the self-calibration system that suited to long-term application was designed. The enantiomorphous design of double-channel was adopted in the self-calibration system, and the coupling mirror based on spherical lens was designed to switch light direction, so the monochromatic light entering the prism was achieved. Based on the design of light path, the reflector which was driven by the stepping motor was designed to switch the optical path, and the flux of incident/emergent light was acquired by the monolithic detector, finally the transmission of the prism was acquired by ratio calculation. The performance of self-calibration system was tested in and out the laboratory, the repeatability error was less than 2.5% indoor and the relative deviation of transmission indoor and outdoor was less than 2%, the results show that the self-calibration system can be used for monitoring and correction of field equipment.