compare between pyranometer and pyrheliometer
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A pyrheliometer is an instrument for measurement of direct beam solar irradiance. ... A pyrheliometer is often used in the same setup with a pyranometer.
PYRANOMETER = 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/m2) from the hemisphere above within a wavelength range 0.3 μm to 3 μm.
The thermoelectric detection principle is used, whereby incoming radiation is almost completely absorbed by a horizontal blackened surface, over a very wide wavelength range. The resulting increase of temperature is measured via thermocouples connected in series or series-parallel to make a thermopile.
PYRHELIOMETER = A pyrheliometer is an instrument for measurement of direct beam solar irradiance. 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 thermoelectric detection principle is used, whereby incoming radiation is almost completely absorbed by a horizontal blackened surface, over a very wide wavelength range. The resulting increase of temperature is measured via thermocouples connected in series or series-parallel to make a thermopile.
CONCLUSION = Pyranometer and Pyrheliometer are two instruments that are used to measure solar irradiance. Both are similar in their objective though have differences in their design and working principle.