基本信息
摘要：The method is based on measuring the relative humidity or concentration of the gas directly, e.g. using a thin-film humidity sensing element 3 of capacitive type, and simultaneously measuring the temperature of the element 3, the temperature of the relative value measuring element 3 being shifted (by means of a Peltier heater/cooler 7) to bring the element 3 into a measurement range of maximally high sensitivity. For example, at low concentrations the element may be cooled to cause operation in the range of 60 to 80% relative humidity. The true dewpoint is computed from the measured relative humidity and the sensed temperature. The ambient temperature may be measured by a further sensor 6. Calibration details are given. The arrangement may be incorporated in an icing predictor, together with a sensor for measuring the temperature of the exposed object e,g, a mast or aircraft wing.
摘要附图：
