Actinometer [əkˈtɪnəˈmiːtə(r)] (Greek) actis (actinos) – light and … meter] – a meteorological instrument that measures the intensity of direct solar radiation (radiation) incident on a surface perpendicular to it. The properties of the operating principle are based on the absorption of radiation by a body close to a black body and the conversion of solar radiation energy into thermal energy. Thermoelectric, thermobimetallic, etc. There are different types. Used in conjunction with a pointer galvanometer.
Ex. The actinometer, a device used to measure the intensity of solar radiation, plays a crucial role in evaluating environmental conditions at the mining site.