The SRRL is the home of the world's largest collection of radiometers in continuous operation including pyranometers, pyrheliometers, pyrgeometers, photometers, and spectroradiometers that can provide the solar resource information necessary for characterizing the performance of solar hydrogen components. (h2awsm.org)
An Apogee pyranometer is mounted to the collector about half way up and in the plane of the collector glazing. (builditsolar.com)
Haywood, J.M., P.N. Francis, I. Geogdzhayev, M. Mishchenko, and R. Frey, 2001: Comparison of Saharan dust aerosol optical depth retrieved using aircraft mounted pyranometers and 2 - channel AVHRR algorithms. (pubs.giss.nasa.gov)