Smoke Detector Chamber Geometry for False Alarm Reduction
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Solution Overview
Problem
Conventional smoke detectors often issue false alarms when detecting cooking fumes, leading to unnecessary alerts and potential false fire incidents.
Innovation Solution
A smoke detector design featuring a chamber with baffle ribs and a specific angle between the transmitter and receiver bases, allowing detection light to penetrate white smoke particles more easily than black smoke particles, reducing false alarms by minimizing the reception of reflected light from white smoke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the conventional smoke detector uses light scattering detection principle, then the warning speed is fast, but false alarms occur when detecting cooking fumes
Solution Approach 1:
The patent applies local quality by creating different optical paths for different smoke types. The chamber geometry and baffle ribs are designed to create specific light scattering patterns that differ for cooking fumes versus fire smoke, allowing the detector to respond differently to each type based on their distinct optical properties
Solution Approach 2:
The patent changes the detection parameters by adjusting the angle between transmitter and receiver bases (45-65 degrees) and modifying the chamber geometry with baffle ribs. These parameter changes create an optical environment where cooking fumes produce insufficient light scattering to trigger the alarm, while fire smoke maintains adequate scattering
2Area of stationary object
If the detection light is emitted toward the smoke collection space, then the detection coverage is improved, but the receiver receives reflected light from white smoke particles causing false alarms
Solution Approach 1:
The baffle ribs serve as intermediary elements that block and redirect light paths. They create physical barriers that prevent direct line-of-sight detection of cooking fumes while allowing fire smoke particles to scatter light effectively toward the receiver
Solution Approach 2:
The patent introduces spatial dimensionality by positioning the transmitter and receiver at specific angular relationships (45-65 degrees) within the chamber. This three-dimensional arrangement creates optical paths that exploit the different scattering characteristics of white smoke versus black smoke particles
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively reduces false alarms caused by cooking fumes by differentiating between white smoke and black smoke based on light reflection angles, ensuring only actual fire incidents trigger alarms.
Implementation Method 1
a detection light emitted by the transmitter is scattered due to the detection light impacting on a plurality of particles of the smoke
Implementation Method 2
a reflection angle when the detection light is irradiated on the black smoke particles is larger than a reflection angle when irradiated on the white smoke particles
Data Source
AI summary
A smoke detector and a chamber are provided. The chamber includes a bottom plate, top plate, a plurality of baffle ribs disposed between the bottom plate and top plate, a transmitter base disposed between the bottom plate and top plate, and a receiver base disposed between the bottom plate and top plate. The receiver base is arranged apart from the transmitter base, and a center point of the chamber, being taken as an apex, the receiver base, and the transmitter base jointly define an angle being in a range of 45 degrees to 65 degrees.