An actinometer is a device used to maesure the heating power of electromagnetic radiation.

An Actinometer

An actinograph is a recording actinometer, a device used to measure the heating power of electromagnetic radiation.

Hans Pettersson has written:

'A transparency-meter for sea-water' -- subject(s): Seawater

'Atlantis und Atlantik'

'Iron and manganese on the ocean floor' -- subject(s): Iron, Manganese, Ocean bottom

'Submarine daylignt' -- subject(s): Actinometer, Solar radiation

A pyranometer is a type of actinometer used to measure broadband solar irradiance on a planar surface and is a sensor that is designed to measure the solar radiation flux density (in watts per metre square) from a field of view of 180 degrees. The name pyranometer stems from Greek, "pyr - πῦρ" meaning "fire" and "ano - ἄνω" meaning "above, sky".