Particle detector with dust rejection
US9805570B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2012 |
| Grant date | Oct 31, 2017 |
| Priority date | — |
| Expiry date | Jan 4, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/24
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system and method of reducing the incidence of false alarms attributable to dust in smoke detection apparatus. The method includes obtaining at least two sample air flows, subjecting a first airflow to particle reduction and measuring the level of particles in the first airflow and generating a first signal indicative of the intensity. The method also includes measuring the level of particles in the second airflow and generating a second signal indicative of the intensity. The first signal is compared to a predetermined alarm level and, if the alarm level is achieved, the first and second signals are subsequently compared and an output signal is generated based on the relative difference between the first and second signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.