Pyrheliometer

Direct beam solar irradiance is the solar irradiance coming directly from the sun. A pyrheliometer is an instrument that can measure 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 signal voltage is then converted via the ADC of a microcontroller. Then, it results in irradiance value. The SI units of irradiance are watts per square metre (W/m²).

    A Sun Tracker is used to keep the pyranometer aligned with the sun during the entire day. The Pyrheliometer is mounted on the Sun Tracker.

    Traditionally pyrheliometers were mainly used for climatological research and weather monitoring purposes. Traditionally pyrheliometers were mainly used for climatological research and weather monitoring purposes

Reference

1. https://en.wikipedia.org/wiki/Pyrheliometer
2. https://www.hukseflux.com/applications/solar-energy-pv-system-performance-monitoring/what-is-a-pyrheliometer