Irradiance

About Us

Irradiance manufactures the RSR2 Rotating Shadowband Radiometer.™ This instrument consists of a silicon photodiode pyranometer and a motor driven band that momentarily shades it from direct sunlight in order to make a measurement. The depth of the shadow and the solar zenith angle can be used to calculate direct normal irradiance (DNI) and diffuse horizontal irradiance (DHI), the two components of sunlight necessary to calculate its effect on non-horizontal surfaces.