Method and arrangement in measurement of humidity, in particular

Details Method and arrangement in measurement of humidity, in particular Method and arrangement in measurement of humidity, in particular

1994-09-27

1996-04-30

Williams, Hezron E.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

73 2901, 7333505, G05D 2202, G01N 2702, G01W 108

Patent

active

055114172

ABSTRACT:
Method and detector arrangement for measurement of relative humidity in particular in radiosondes (100). In the humidity detector (14), an active material is used whose electric properties are a function of the amount of water absorbed by said material. The humidity detector (14) is heated so as to remove any ice, frost or condensed humidity gathered on its face and/or in its vicinity. The temperature (T) of the humidity detector (14) and/or the ambient temperature (T.sub.a) is/are detected, and this/these quantity/quantities is/are utilized in the computing of the humidity measurement values (U). The humidity detector (14) is protected by means of a mechanical shield construction (10) arranged around the detector. The shield construction (10) is heated to a temperature higher than the ambient temperature so that no substantial condensing or freezing of humidity takes place on the humidity detector (14) or on the structures in the vicinity of same.

REFERENCES:
patent: 3168829 (1965-09-01), Nelson
patent: 3350941 (1965-05-01), Misevich et al.
patent: 3599862 (1971-08-01), Hogan
patent: 4035644 (1977-07-01), Ciemochowski
patent: 4915816 (1990-04-01), Shakkottai et al.
patent: 5156045 (1992-10-01), Ponkala
patent: 5156046 (1992-10-01), Ponkala
patent: 5365784 (1994-11-01), Morrissey

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