Opto-mechanical Design of Unattended Irradiance Spectroradiometer in Reflective Solar Bands

The opto-mechanical system design of self-developed reflective solar bands irradiance spectroradiometer is introduced. The instrument has a spectral range of 400~2500 nm, including three spectral modules, and it can achieve automatic long-term measurement of total solar irradiance, diffuse sky irradiance, direct solar irradiance and the ratio of diffuse irradiance to full irradiance. In order to verify the rationality of the opto-mechanical design, the field experimental data are analyzed. By comparing with the ratio data of the traditional manual measurement, the ratio deviation of the two methods is less than 2%. The instrument has the same irradiance measurement accuracy with the traditional measurement method and has certain advantages in automatic calibration of satellite remote sensor.