What is the name of the instrument used to measure overall or indirect solar radiation?
A pyranometer is a type of actinometer used to measure broadband solar irradiance on a planar surface and is a sensor that is designed to measure the solar radiation flux density (in watts per metre square) from a field of view of 180 degrees. The name pyranometer stems from Greek, “pyr” meaning “fire” and “ano” meaning “sky”.