Method for determining the absolute humidity of air
US5814726A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 1997 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Mar 12, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/223
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining the absolute humidity of air by aid of a capacitive sensor and a temperature sensor as well as a heating element. The sensor temperature is changed upon reaching a predetermined humidity limit value. In order to eliminate the risk of falsified measuring values and to enable long-time stable and accurate measuring also in the high-humidity range, the determination of the humidity of air until reaching the predetermined humidity limit value is effected by evaluating the value measured for the capacity of the sensor. Upon reaching a predetermined limit value, the temperature of the sensor is controlled to a constant sensor capacity by heating and is evaluated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.