Category:sunphotometer

This category uses the form Instrument.

URI: https://vocabulary.actris.nilu.no/actris vocab/sunphotometer

label: sun photometer (en)

description: Photometer mounted on a tracking system to always point towards the sun to measure the direct sun radiance. Can be equipped with spectral filters to measure the direct sun radiance at targeted wavelengths. By calibration, the optical depth of the atmosphere can be inferred from the direct sun radiance. By using assumptions on the atmospheric temperature and pressure profile, or corresponding information from weather forecast models or radio sonde soundings, the optical depth due to aerosol particles in the atmosphere column can be calculated. (en)