Vaisala Oy

Vaisala Oyj

Ari Paukkunen

Jorma Ponkala

Lars Stormbom

Veijo Antikainen

Hannu Jauhiainen

A method for correcting humidity measurement results of a radiosonde, especially for errors resulting from radiative heat exchange. Environmental humidity Uis measured with a humidity sensor in the radiosonde, a current value of at least one environmental condition parameter is determined, and error-corrected humidity U is calculated directly or indirectly utilizing the measured environmental humidity Uand a correction value corresponding to the at least one current environmental condition parameter value.

Correction of humidity measurement results of a radiosonde

An impedance detector, in particular for radiosonde operation. The detector comprises a substrate (10 . . . 10E) made of an insulating material, onto which substrate the electrode and contact patterns (11, 11a, 13) necessary for the formation and connecting of the detector impedance have been applied. Between the detector impedance electrodes (11, 13), there is an active film (12), whose impedance values are a function of the physical quantity measured by means of the detector. The substrate of the detector is an oblong core filament (10; 10B; 10C; 10D; 10E) of an insulating material, onto and around which core filament said electrodes (11, 13) and said active insulating film (12) have been applied. Also, a novel process is described for the manufacture of said impedance detector.

Impedance detector, in particular for radiosonde operation, as well as a

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.

Method and arrangement in measurement of humidity, in particular in

Method, in particular in radiosondes, for measurement of relative humidity by using a capacitive humidity detector (10) or a combination of detectors (10.sub.1,10.sub.2 ;10P), as well as humidity detectors. In the detector, between the capacitor plates, an insulating material (12) is used, whose permittivity is a function of the amount of water vapor absorbed by the insulating material (12). The detector (10) or the combination of detectors is heated in order to remove any ice, frost or condensed humidity deposited on the face and/or in the environment of the detector. The detector capacitance (C.sub.M) or a part (C.sub.1 . . . C.sub.N) of same is heated, in time and/or in place, periodically by means of electric current (I). The detecting of the detector capacitance (C.sub.M) is carried out without measurement of the detector temperature after the detector capacitance or a part (C.sub.1 . . . C.sub.N) of same has cooled down substantially to the temperature of the environment where the ratio of the duration of the measurement cycle to the duration of the heating cycle is selected from a minimum range of 10 to one, up to a maximum range of 3000 to one.

Method for measurement of relative humidity, in particular in

Method, in particular in radiosondes, for measurement of relative humidity by using a capacitive humidity detector (10) or a combination of detectors (10.sub.1, 10.sub.2 ; 10P), as well as humidity detectors. In the detector, between the capacitor plates, an insulating material (12) is used, whose permittivity is a function of the amount of water absorbed by the insulating material (12). The detector (10) or the combination of detectors is heated in order to remove any ice, frost or condensed humidity deposited on the face and/or in the environment of the detector. The detector capacitance (C.sub.M) or a part (C.sub.1 . . . C.sub.N) of same is heated, in time and/or in place, periodically by means of electric current (I). The detecting of the detector capacitance (C.sub.M) is carried out without measurement of the detector temperature after the detector capacitance or a part (C.sub.1 . . . C.sub.N) of same has cooled down substantially to the temperature of the environment.

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Vantaa, Finland

Ari Paukkunen