Rotating Shadow Band Radiometer

an instrument that determinestotal solar radiation anddiffuse sky radiation byperiodically shading the total sky sensor from the sun with a rotatingshadow band.Below is a picture of a rotating shadow band radiometer at theSolar Radiation Research Laboratory. The curved black shadowband atthe right of the instrument is at rest; once every minute, it rotates 180&#176 to obscure the sun fora few seconds, then returns to its resting position.
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