What is a Pyranometer and How is it Used to Measure Solar Radiation?
A pyranometer is a scientific instrument designed to measure solar radiation flux density (W/m²) from a hemispherical field of view. It plays a critical role in meteorology, climatology, solar energy systems, and agricultural research.
How Does a Pyranometer Work?
Pyranometers operate based on the thermoelectric effect. They contain a blackened sensor that absorbs solar radiation, causing a temperature difference between the sensor and the instrument body. This generates a voltage signal proportional to the solar irradiance.
A pyranometer is used to measure global horizontal irradiance, which includes both direct and diffuse sunlight. This data is essential for assessing solar energy potential and environmental conditions.
Key Applications and Benefits
Pyranometers are vital in photovoltaic system monitoring, weather stations, and climate research. They help optimize solar panel efficiency, support renewable energy projects, and contribute to accurate climate modeling.
Frequently Asked Questions
What units does a pyranometer use?
Pyranometers measure irradiance in watts per square meter (W/m²).
How is it calibrated?
Calibration is typically done against a standard reference pyranometer under clear sky conditions.
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