**What is a Pyranometer Used to Measure?**
A pyranometer is used to measure global solar radiation flux density, expressed in watts per square meter (W/m²). This scientific instrument captures sunlight across a hemispherical field of view, quantifying both direct and diffuse solar irradiance. It plays a critical role in meteorology, climatology, solar energy systems, and agricultural research.
**Key Applications and Industries**
Pyranometers are essential in solar power plants for monitoring panel efficiency and predicting energy output. In weather stations, they help track climate patterns by measuring sunlight intensity. Agricultural experts rely on them to study crop growth conditions and evapotranspiration rates.
**How Does a Pyranometer Work?**
These devices use a thermopile sensor with a blackened surface that absorbs solar radiation uniformly. The temperature difference between the sensor and its base generates a voltage signal proportional to irradiance. Advanced models include temperature compensation and cosine correction for accuracy.
**Frequently Asked Questions**
**What units does a pyranometer use?**
It measures irradiance in W/m², with data often integrated over time for energy calculations (kWh/m²).
**Can pyranometers measure artificial light?**
While primarily designed for solar spectrum detection, some specialized models can measure broad-spectrum artificial sources.
**How often should pyranometers be calibrated?**
Annual calibration against reference standards is recommended for scientific and industrial applications.
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