Piranometer: Perbedaan antara revisi

To make a measurement of [[irradiance]], it is required by definition that the response to “beam” radiation varies with the [[cosine]] of the angle of incidence, so that there will be a full response when the solar radiation hits the sensor perpendicularly (normal to the surface, sun at zenith, 0 degrees angle of incidence), zero response when the sun is at the horizon (90 degrees angle of incidence, 90 degrees zenith angle), and 0.5 at 60 degrees angle of incidence. It follows that a pyranometer should have a so-called “directional response” or “cosine response” that is close to the ideal cosine characteristic.

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|url=http://www.iso.org/iso/catalogue_detail.htm?csnumber=16629

|title=ISO 9060:1990 Classification of Pyranometers