Solar Radiation Measurements using pyrheliometer in Hindi || Pyrheliometer Working & Construction

Here you will learn about beam radiation, Defuse radiation, Thermocouple, black body & pyrheliometer.

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Direct Radiation vs Diffuse Radiation:

"Direct radiation" is also sometimes called "beam radiation" or "direct beam radiation". It is used to describe solar radiation traveling on a straight line from the sun down to the surface of the earth.

"Diffuse radiation", on the other hand, describes the sunlight that has been scattered by molecules and particles in the atmosphere but that has still made it down to the surface of the earth. Direct radiation has a definite direction but diffuse radiation is just going any which way. Because when the radiation is direct, the rays are all travelling in the same direction, an object can block them all at once. This is why shadows are only produced when direct radiation is blocked.

Thermocouple: A Thermocouple is a sensor used to measure temperature. Thermocouples consist of two wire legs made from different metals. The wires legs are welded together at one end, creating a junction. This junction is where the temperature is measured. When the junction experiences a change in temperature, a voltage is created.


Angstrom pyrheliometer: Pyrheliometer is an instrument used to measure the quantity of heat radiation and solar constant. Pyrheliometer designed by Angstrom is the simplest and most accurate.

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