Physical quantity, particularly humidity detection device, and related detecting method
US7498823B2 · kind B2 · utility
5Cited by
23References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 14, 2005 |
| Grant date | Mar 3, 2009 |
| Priority date | — |
| Expiry date | Nov 1, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/0031
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pair of identical humidity sensors (S1) and (S2) are in the same environment, so that they identically react to humidity effects; a sensing circuit includes an operational amplifier (10), its input (15) receiving from the first sensor (Si) a signal changing with humidity according to a logarithmic law, while the second sensor (S2), inserted in the amplifier feedback, reacts to humidity changes in the same way as the first sensor (Si) and consistently modifies the gain. The output signal (V0) is compensated, and has a substantially linear progression with humidity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.