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 Photo Gallery: Solar and Wind Measurements
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The sun heats up a black absorber plate under the glas dome of the pyranometer.
The temperature difference to the ambient is propotional to the global irradiance.
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If a pyranometer is shaded with a shadowband, it measures the diffuse irradiance.
The shadowband has to be adjusted to the sun orbit every few days.
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At a RSP a shadowband rotates continously around the sensor.
A silicon sensor is used, that is faster but less precise than a thermal sensor.
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A pyrheliometer measures the direct irradiance coming form the sun direction.
It follows continously the sun. That makes the measurements complicate and expensive.
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The sensor is at the end of a long tube. Only direct irradiance reaches the sensor,
the tube holds the diffuse irradiance away.
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At this measurement station three different sensors for the measurement of global,
diffuse and direct irradiance are combined.
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Measurements of wind speed and wind direction are needed for the wind power.
A standard measurement height is 10 m. The sensors are mounted on the top of a tower.
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An anemometer measures the wind speed. The wind drives a shaft with 3 half-shells.
A tachometer or magnetic contacts measure the rotating speed that is proportional to the wind speed.
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Anemometers can have different structures.
In danger of freezing they must be heated.
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All photos © by Volker Quaschning.
Please consider the terms of use.
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