SIMP (Spectal Pyranometer Eppley)

The Eppley Precision Spectral Pyranometer (PSP) is a World Meteorological Organization First Class Radiometer, designed for the measurement of total solar radiation (the sum of direct and diffuse). It comprises a rectangular multi-junction wire-wound Eppley thermopile glued to the back of the sensor disk. This disk is coated with Parson's black lacquer (for non-wavelength selective absorption). The dome consists of a pair of precision ground and polished hemispheres of Schott optical glass. Both hemispheres are made of clear WG295 glass which is uniformly transparent to energy between 0.285 to 2.8µm.