HIM- measuring device for determining the duration of sunshine

Sunshine autograph, heliograph, device for measuring the duration of direct solar radiation. In the sunshine autograph developed by Campbell and Stokes, the direct radiation is concentrated by means of a full sphere made of glass with a diameter of 9-12 cm, so that the solar radiation leaves a focal trace on a strip of cardboard ( Fig. ). The length of the burn mark corresponds to the duration of the direct solar radiation. The cardboard strips have to be changed daily, in the tropics and polar summer even twice daily. This effort and the manual evaluation lead to the fact that sunshine autographs are more and more replaced by pyranometers, with whose continuous registrations of the energy flux density the data of the sunshine duration can be synthetically generated.

Sunshine autograph, heliograph, device for measuring the duration of direct solar radiation. In the sunshine autograph developed by Campbell and Stokes, the direct radiation is concentrated by... read more »
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HIM- measuring device for determining the duration of sunshine

Sunshine autograph, heliograph, device for measuring the duration of direct solar radiation. In the sunshine autograph developed by Campbell and Stokes, the direct radiation is concentrated by means of a full sphere made of glass with a diameter of 9-12 cm, so that the solar radiation leaves a focal trace on a strip of cardboard ( Fig. ). The length of the burn mark corresponds to the duration of the direct solar radiation. The cardboard strips have to be changed daily, in the tropics and polar summer even twice daily. This effort and the manual evaluation lead to the fact that sunshine autographs are more and more replaced by pyranometers, with whose continuous registrations of the energy flux density the data of the sunshine duration can be synthetically generated.

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