Silver-disk pyrheliometer: Difference between revisions

Latest revision as of 16:53, 25 April 2012

silver-disk pyrheliometer

An instrument used for the measurement of direct solar radiation.

It consists of a silver disk located at the lower end of a tube containing a diaphragm that serves as the radiation receiver for a calorimeter. Radiation falling on the silver disk is periodically intercepted by means of a shutter located in the tube, causing temperature fluctuations of the calorimeter that are proportional to the intensity of the radiation. The instrument is normally used as a secondary instrument and is calibrated against the water-flow pyrheliometer. It was used by the U.S. Weather Bureau as a standard instrument. Currently, this instrument's function has been replaced by an absolute cavity radiometer.
See pyrheliometer, cavity radiometer.

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-<div class="definition"><div class="short_definition">An instrument used for the measurement of [[direct solar radiation]].</div><br/> <div class="paragraph">It consists of a silver disk located at the lower end of a tube containing a diaphragm that serves  as the [[radiation]] receiver for a [[calorimeter.]] Radiation falling on the silver disk is periodically  intercepted by means of a shutter located in the tube, causing [[temperature]] fluctuations of the  calorimeter that are proportional to the [[intensity]] of the radiation. The instrument is normally  used as a [[secondary instrument]] and is calibrated against the [[water-flow pyrheliometer]]. It was  used by the U.S. Weather Bureau as a standard instrument. Currently, this instrument's function  has been replaced by an [[absolute cavity radiometer]]. <br/>''See'' [[pyrheliometer]], [[cavity radiometer]].</div><br/> </div>
+<div class="definition"><div class="short_definition">An instrument used for the measurement of [[direct solar radiation]].</div><br/> <div class="paragraph">It consists of a silver disk located at the lower end of a tube containing a diaphragm that serves  as the [[radiation]] receiver for a [[calorimeter|calorimeter.]] Radiation falling on the silver disk is periodically  intercepted by means of a shutter located in the tube, causing [[temperature]] fluctuations of the  calorimeter that are proportional to the [[intensity]] of the radiation. The instrument is normally  used as a [[secondary instrument]] and is calibrated against the [[water-flow pyrheliometer]]. It was  used by the U.S. Weather Bureau as a standard instrument. Currently, this instrument's function  has been replaced by an [[absolute cavity radiometer]]. <br/>''See'' [[pyrheliometer]], [[cavity radiometer]].</div><br/> </div>
 </div>