actinometer meaning in Hindi

He named seven moons of Saturn and four moons of Uranus, invented the cyanotype and actinometer, and wrote extensively on topics including meteorology, physical geography and the telescope.
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.
A "'pyranometer "'is a type of actinometer used for measuring solar irradiance on a planar surface and it is designed to measure the solar radiation flux density ( W / m 2 ) from the hemisphere above within a wavelength range 0.3 ?m to 3 ?m.

noun.

an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect)