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  
A pyranometer operates based on the thermopile principle or photodiode technology. The thermopile-based pyranometer consists of a set of thermocouples that generate a voltage in response to temperature differences caused by solar radiation. The sensor is covered by a transparent hemispherical glass dome to __________ ___ _______ ______ ___ ________ ______ _________ ___ __________ _________ _________.
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