Rotating sunshine meter - rotating sunshine meter

Japanese: 回転式日照計 - かいてんしきにっしょうけい
Rotating sunshine meter - rotating sunshine meter

...The Jordan sunshine meter uses a sealed cylinder with photosensitive paper placed inside, and calculates the hours of sunshine from the light trail made by sunlight entering through two small holes in the cylinder. Recently, with the definition of the hours of sunshine now being established, rotating sunshine meter is being adopted as a sunshine meter suitable for the modern age of advanced electronic technology. This method involves rotating a reflector or the like to guide the sunlight entering through it to a pyroelectric element (a material that generates electricity when subjected to a temperature change), and judging the presence or absence of sunlight from the power of the element, which changes as it rotates, and outputting it as a pulse. ...

*Some of the terminology used to refer to the "rotating sunshine meter" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…ジョルダン式日照計は密封した円筒の中に感光紙をセットしておき,円筒につくられた2個の小さな穴から入射する太陽光によって描かれた光跡から日照時間を求めるものである。最近,日照時間の定義が定められたこともあって,電子技術の進んだ現代にふさわしい日照計として回転式日照計が採用されつつある。これは反射鏡などを回転させてそこから入ってきた太陽光を焦電素子(温度変化を受けると電気を発生する物質)に導き,回転とともに変化する素子の電力から日照の有無を判定し,パルスとして出力する方式である。…

※「回転式日照計」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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