Pyrheliometer
Pyrheliometer (from gr pyros = " fire" and helios = " sun ", ie literally: Sunfire meter ) are among the meteorological radiometers ( = radiation pyrometry measurement). Measure the direct irradiance ( in watts per square meter) from the sun direction. Previously they were referred to as Pyroheliometer.
Operation
The radiation from a black thermopile or thermometer ( for example, a black-colored metal strip ) or a black hollow body of known heat capacity absorbed. The incident radiation leads to a heating from which the radiation flux can be calculated. Depending on the nature of the protective cover can only wind the short-wave radiation part (quartz glass ), or all of the radiation (plastic) to be measured. Gauges that measure the total radiation, so-called pyranometer work without shielding of the indirect radiation and are useful for performance measurement of solar energy systems.
Measurement principles
It will be applied three different measurement principles:
Designs
There are the following types:
- Waterflowpyrheliometer by Abbot ( measuring principle 1)
- Waterstirpyrheliometer by Abbot ( measuring principle 1)
- Eispyrheliometer after Volochine (measuring principle 1)
- Silverdiskpyrheliometer by Abbot ( with calibration) (measuring principle 1)
- Kompensationspyrheliometer by Angstrom ( Measurement Principle 3)
- Pyrheliometer Marvin ( measuring principle 1 & 3)
See also: pyranometer, pyrometers, radiometers, actinometer