Relative humidity measurement
US4227411A · kind A · utility
17Cited by
5References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 24, 1979 |
| Grant date | Oct 14, 1980 |
| Priority date | — |
| Expiry date | Sep 24, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N25/68
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.