Humidity sensing apparatus and method

Details Humidity sensing apparatus and method Humidity sensing apparatus and method

1994-04-18

1997-03-25

Brock, Michael

Measuring and testing

Gas analysis

Moisture content or vapor pressure

G01N 2704, G01W 100

Patent

active

056146710

ABSTRACT:
The present invention is a humidity sensor which can be used in a radiosonde. The humidity sensor includes a heat sink attached to the radiosonde, a Peltier cooler attached to the heat sink, a carbon element with a thermistor attached therein or thereon, and a control means. The resistance of the carbon element is adjusted to a predetermined level to maintain a relative humidity of about 33, in particular. The control means monitors this resistance and adjusts the Peltier cooler accordingly. The thermistor responding to the temperature of the carbon element outputs a resistance indicative of the temperature on the sensor surface.

REFERENCES:
patent: 2352578 (1944-06-01), Wallace
patent: 3599862 (1971-08-01), Hogan et al.
patent: 4227411 (1980-10-01), Abramovich
patent: 4793181 (1988-12-01), Djorup
patent: 4793182 (1988-12-01), Djorup
patent: 5365784 (1994-11-01), Morrissey

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