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Particle detector with dust rejection

A technology of particles and detection chambers, applied in the field of particle detectors, can solve the problem that the sharp pulse is not so effective

Inactive Publication Date: 2014-02-26
GARRETT THERMAL SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although dust can be detected by detecting spikes in the scattered light level, there is a concern that this method is less sensitive to spikes caused by dust mergers (due to the simultaneous presence of multiple particles in the detection area) in locations with high dust levels. efficient

Method used

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  • Particle detector with dust rejection
  • Particle detector with dust rejection
  • Particle detector with dust rejection

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Embodiment Construction

[0046] Preferred embodiments of the present invention enable the particle detection system to differentially detect particles having different characteristics. In a preferred form, the system enables particles forming part of a first particle size distribution to be detected separately from particles belonging to a second size distribution. Preferably, this is achieved by detecting particles in two subsets of the total particles in the air sample, one of which is substantially eliminated, and performing a differential analysis of the detected particle levels.

[0047] For example, dust particles present in a room have a particle distribution centered at 2 μm, and smoke caused by a fire in an electrical system has a particle distribution centered at 0.75 μm. When an adjustment has been made such that the particles in the first distribution (dust) have been cleared, a first measurement of the particles in the air flow can be carried out. A second measurement is performed on the...

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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.

Description

technical field [0001] The invention relates to a particle detector employed in a sensing system for detecting particles in an air volume. More particularly, although not exclusively, the present invention relates to aspirating smoke detectors. However, the invention is not limited to this particular application, and other types of sensing systems for detecting particles in air volumes are also within the scope of the invention. Background technique [0002] False triggering of smoke detection systems due to exposure to dust. In aspirating smoke detection systems, various analytical solutions have been implemented in order to reduce dust and thereby avoid false alarms. In light-scattering smoke detection systems, by using time-amplitude analysis (dust tends to produce spikes in the scatter signal that can then be cleared) or by using multiple wavelengths of light, multiple polarizations, multiple field angles, inertial Separation, mechanical filtration (for example throug...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B17/10
CPCG08B29/24G08B17/10
Inventor 凯末尔·阿贾伊布赖恩·亚历山大
Owner GARRETT THERMAL SYST LTD
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