Composite fire sensor
US4640628A · kind A · utility
22Cited by
11References
6Claims
0Family size
Inventors
Key dates
| Filing date | Jul 11, 1985 |
| Grant date | Feb 3, 1987 |
| Priority date | — |
| Expiry date | Jul 11, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/00
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A composite fire sensor comprising a first sensor element sensitive to a change in incident infrared rays, a second sensor element having a variable electric conductivity according to gas absorption/desorption, at least one comparator for combining the outputs of the first and second sensor elements, and a delay circuit for delaying the output of at least one of the comparators. Predetermined reference voltages are supplied to the comparators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.