Sensor device having plural resistance change sensors and method of using the same
US9753430B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2014 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | Apr 18, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00084
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
To detect humidity, used are a first series connection circuit connecting a thermistor and a fixed resistor via a node, a second series connection circuit connecting a resistance change type humidity sensor and the thermistor via the node, and a third series connection circuit connecting the humidity sensor and the fixed resistor via the node. A predetermined voltage is applied across the first circuit to detect a first voltage indicating temperature through the node, and secondly across the second circuit to detect a second voltage indicating a first humidity through the node, and finally across the third circuit to detect a third voltage indicating a second humidity through the node. Then, the first voltage is compared with a reference voltage and judgment is made, based on a comparison result, to determine which of the second voltage and the third voltage is relevant to use as a basis for outputting the humidity as detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.