Ångström compensation pyrheliometer

Ångström compensation pyrheliometer

[′ȯŋ·strəm käm·pən′sā·shən ¦pīr‚hē‚lē′äm·əd·ər]
(engineering)
A pyrheliometer consisting of two identical Manganin strips, one shaded, the other exposed to sunlight; an electrical current is passed through the shaded strip to raise its temperature to that of the exposed strip, and the electric power required to accomplish this is a measure of the solar radiation.