Question

what is the difference beetween pyroheliometer and pyranometer?​

Answer 1

Answer:

A pyrheliometer is an instrument for measurement of direct beam solar irradiance.[1] Sunlight enters the instrument through a window and is directed onto a thermopile which converts heat to an electrical signal that can be recorded. The signal voltage is converted via a formula to measure watts per square metre.

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/m2) from the hemisphere above within a wavelength range 0.3 μm to 3 μm.