Humidity sensing apparatus and method therefor

Details Humidity sensing apparatus and method therefor Humidity sensing apparatus and method therefor

1988-12-13

1990-01-16

Williams, Hezron E.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

333 35, G01W 102, G01W 108

Patent

active

048935085

ABSTRACT:
A sensing system and method suitable for use in humidity sensing instruments such as radiosondes to determine the true relative humidity of the atmosphere contemporaneously with other parameters at the same altitude as the radiosonde rises or descends. The indicated relative humidity of the air contiguous with a humidity sensing element and the temperature of the humidity sensor and the surrounding air temperature, remote from the sensor, are measured. The true relative humidity of the surrounding air is determined by the product of the indicated relative humidity and the ratio of the saturated vapor pressure at the sensor temperature to that at the surrounding air temperature.

REFERENCES:
patent: 3926052 (1975-12-01), Bechtel
patent: 4227411 (1980-10-01), Abramovich
patent: 4481514 (1984-11-01), Beukers et al.
James F. Morrissey et al, "Temperature-Induced Errors in the ML-476 Humidity Data", Journal of Applied Meteorology, vol. 9, No. 5, Oct. 1970, pp. 805-808.

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