Latitude: 39.742o North
The Atmospheric Optical Calibration System (AOCS) was developed at the National Renewable Energy Laboratory (NREL) to provide
low-cost measurements of atmospheric optical and spectral solar irradiance conditions pertinent to photovoltaic (PV) device
performance measurements. Optical properties of interest are molecular and aerosol scattering, aerosol absorption, water vapor
absorption and the ratio of diffuse to global horizontal photon flux densities for the region 0.40 to 0.70 micrometer.
Measurements are used as input to the SPECTRL2 model to estimate the spectral solar irradiance (0.3 to 4 micrometers) impingent on the device.
Measurements using the AOCS will be used by the PV community to measure, in real time, the effects of atmospheric optical and
spectral solar irradiance on device performance.
More information is available in the Atmospheric Optical Calibration System for Outdoor Testing of Photovoltaic Devices paper (1.11 MB PDF File).