Patent ID: 7509838

Claim:
A method for correcting humidity measurement results of a radiosonde in respect to errors resulting from radiative heat exchange, the radiosonde comprising at least a humidity sensor and a temperature sensor, the method comprising: determining correction values for humidity measurement results in different environmental conditions, said correction values being organized in a beforehand formed data structure or calculated utilizing a beforehand determined mathematical function, said environmental conditions being determined as a function of at least one environmental conditions parameter, said environmental conditions parameter being a variable having an effect in the environment of the humidity sensor and said correction values being determined so that they correct errors resulting from radiative heat exchange, measuring environmental humidity U m with said humidity sensor, determining a current value of at least one environmental conditions parameter, measuring the environmental temperature T T with said temperature sensor, calculating humidity sensor temperature T U , utilizing said measured environmental temperature T T and said correction values, which are differences Î”T U between the measured environmental temperature T T and the humidity sensor temperature T U and correspond to the determined current value of said at least one environmental conditions parameter, and calculating error-corrected humidity U utilizing the calculated humidity sensor temperature T U , the measured environmental temperature T T and the measured environmental humidity U m .