Question:

The instrument which measures total or global radiation over a hemispherical field of view is

Show Hint

Pyranometer = Global (Total) radiation. Pyrheliometer = Direct radiation only.
  • Pyranometer
  • Pyrheliometer
  • Solarimeter
  • Sunshine recorder
Show Solution
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The Correct Option is A

Solution and Explanation


Step 1: Concept

Solar radiation measurement requires specific instruments depending on whether the radiation is direct, diffused, or total (global).

Step 2: Meaning

Global radiation includes both the direct beam from the sun and the diffuse radiation scattered by the atmosphere.

Step 3: Analysis

A pyranometer is designed to measure this total solar irradiance from a $180^{\circ}$ field of view. In contrast, a pyrheliometer measures only direct beam radiation by tracking the sun.

Step 4: Conclusion

Therefore, the pyranometer is the correct instrument for measuring global radiation.
Final Answer: (A)
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