The Finnish Radiosonde With Rolled Hair as hygrometer

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Raab, Lars (2011)

In the last years the rolled hair (also called the Frankenberger-hair or Pernix-hair) with very good response at low temperatures has been used at the humidity sensing element in the German morse-radiosonde. In two papers SCHULZE (1952) shows from measurements made at Flensburg how extremely useful the new method is in measuring humidity. The time-constant of the rolled hair hygrometer at normal temperatures is five times smaller than that of the unrolled hair and the hair is also functioning at as low temperatures as - 70° C, where the time constant is about 500 sec at 100 per cent humidity.DOI: 10.1111/j.2153-3490.1954.tb01134.x
  • References (2)

    SCHULZEW,., (1952):Zur Tdgheit und Feuchteniessung des gewalzten Haares nach FRANKENBERGAEmR.. d. Mer. Heft I - 2 . p. 35.

    SCHULZEW,., (1952): Zur Feuchteniessung in der freien Atmosphare mit dein gewalzten Haar. Ann. d. Met. Heft 7 - 12,p. 223.

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