Observation


receiving surface, hence no attention need be paid to



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receiving surface, hence no attention need be paid to
orientation.
- Th Eppley pyranometer has two concentric silver rings for
receiving surface. One of which is coated black and the
other white. The temperature difference between the two
rings is measured with thermojunctions.
- The Dirmhirm-Sauberer pyranometer uses black and white
segments alternately mounted in the form of a star. Again
the temperature difference is measured with thermojunctions
which are in good thermal contact with the segments.
The above mentioned thermopile instruments are covered by
hemispherical glass domes of mm thickness. They are usually
well sealed and provision is made that the air inside be kept
dry with silica gel. The time required for about 90$ response
to a sudden change varies between 20 to 30 seconds. The
temperature coefficient does not exceed -0.2$ per degree

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