Describe in detail any two solar radiation measuring instruments.

Solar radiation measurement is essential for assessing the availability of solar energy, designing photovoltaic (PV) systems, and understanding atmospheric processes. Two important instruments used for measuring solar radiation are the Pyranometer and the Pyrheliometer.  

### 1. Pyranometer  
A pyranometer is an instrument used to measure global solar radiation, which includes both direct and diffuse radiation. It is widely used in meteorological studies, solar energy research, and photovoltaic system performance analysis.  

#### Working Principle  
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