Relative humidity measurement
AssigneeRCA Corporation
InventorAbe Abramovich
Life of this patent
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Abstract
A relative humidity measuring instrument includes two spaced electrodes on an insulating substrate which is mounted on a Peltier-effect thermoelectric module. When the substrate is cooled by the thermoelectric module, a comparator connected to the electrodes on the substrate detects a decrease in resistance between said electrodes due to condensation of moisture therebetween. Then a microcomputer receptive to temperature signals from a thermometer on the substrate and an ambient thermometer computes the relative humidity.
Claims9
A relative humidity measuring instrument, comprising
- two spaced electrodes on an insulating substrate,
- a substrate thermometer and an ambient thermometer,
- means to cool, and then heat, said substrate,
- a comparator connected to said electrodes to detect a decrease in resistance between said electrodes due to condensation of moisture therebetween, and
- a computer receptive to temperature signals from said thermometers and operative in response to an output from said comparator to compute the relative humidity.
A relative humidity measuring instrument comprising, in combination:
- a substrate which when cooled to the dew point of the ambient air, causes moisture to condense on a surface thereof;
- a pair of electrodes spaced from one another on said surface of said substrate;
- means for cooling the substrate at least to the point at which moisture condenses thereon;
- means coupled to said electrodes for producing a control signal when the resistance between said electrodes reduced to a given value in response to said moisture condensation;
- first temperature measuring means for producing a first output signal indicative of the temperature of the substrate;
- and
- second temperature measuring means for producing a second output signal indicative of the temperature of the ambient air, the humidity of which is to be measured;
- whereby, said first and second output signals can be used upon the occurrence of said control signal to determine the relative humidity of said ambient air.
Dependencies are inferred from the claim text.