Scattered-light alarm

A technology of scattered light and smoke alarms, applied in the direction of alarms, fire alarms, scattering characteristics measurement, etc., can solve problems such as negative effects of sensitivity
CN1662942BInactive Publication Date: 2010-05-12SIEMENS SWITZERLAND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SIEMENS SWITZERLAND
Publication Date
2010-05-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

The smoke detector comprises an optical measuring chamber, comprising a sensor arrangement (2) with at least one light source (12, 12'), a light sensor (11) and a labyrinth system (7) with diaphragms(16) arranged at the periphery of the measuring chamber. The light sources (12, 12') and the light sensor (11) are each arranged in a housing (14, 15; 13). Said housings (14, 15; 13) have a rectangular form and comprise a small window opening. The at least one light source (12, 12') and the light sensor (11) are arranged in the rear section of the housing (14, 15; 13) and a relatively large separation is formed between the optical surfaces of the at least one light source (12, 12') through which light passes and / or the lens of the light sensor (11). Said separation is preferably greater than the diameter of said optical surfaces or said lens. A compact, open dispersion chamber is formed in the measuring chamber between the light exit or entry of the housing (14, 15; 13) and the opposing diaphragm (16).
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Description

technical field

[0001] The invention relates to a scattered light smoke alarm comprising an optical measuring chamber comprising a sensing device having at least one light source and one light receiver and a labyrinth-type isolation assembly of spacers arranged on the circumference of the measuring chamber, wherein the The at least one light source and light receiver are respectively arranged in the casing. Background technique

[0002] In scattered light smoke detectors, which optionally include other sensors, such as temperature sensors, in addition to the optical measuring chamber, known optical measuring chambers are designed in such a way that interfering extraneous light does not penetrate into them, but smoke easily enters into them. The at least one light source and its light receiver are arranged such that the light beam does not take a direct path from the at least one light source to its light receiver. In the presence of smoke in the light beam, light from at le...

Claims

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