Environmental abnormality detecting apparatus
US4638304A · kind A · utility
20Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1984 |
| Grant date | Jan 20, 1987 |
| Priority date | — |
| Expiry date | Dec 12, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/107
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An environmental abnormality detecting apparatus for detecting abnormality in atmosphere such as heat, smoke, and a gas. A sampling circuit is provided for periodically sampling analog signals from a detector for detecting these phenomena. A quantizer quantizes sampled signals with step levels. An accumulator having a plurality of counters provides different accumulation times corresponding to the step levels. Reliability in accumulation effect is not degraded, and an abnormality signal can be detected in a short period of time when a degree of abnormality is high.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.