Smoke Detector Light-Shielding Segmentation
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Solution Overview
Problem
Conventional optical smoke detectors face accuracy issues due to ambient light interference and compromised gaseous permeability, as holes for gas exchange allow light to enter, reducing detection accuracy.
Innovation Solution
A smoke detector design featuring a substrate with a ring shape region and central detection area, a base with overlapping block structures, and a top cover with a guiding channel for gaseous matter, which prevents ambient light from reaching the optical detection module while maintaining high gaseous permeability through airtight and dimming structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If holes are formed on the housing for gas exchange, then gaseous permeability is improved, but ambient light enters through the holes reducing detection accuracy
Solution Approach 1:
The housing is segmented into multiple functional regions: a light-shielding region with through-holes for gas exchange, and a detection region with a light-tight window. This segmentation allows different parts of the housing to perform different functions - gas exchange in the light-shielding region while maintaining light-tightness in the detection region, thus resolving the contradiction between gaseous permeability and detection accuracy.
Solution Approach 2:
Different regions of the housing are assigned different optical properties: the light-shielding region has holes for gas exchange, while the detection region has a light-tight window. This local differentiation allows the housing to simultaneously achieve gaseous permeability where needed and light-shielding where required, resolving the technical contradiction.
2Measurement precision
If a shelter is disposed around the housing to block ambient light, then detection accuracy is improved, but gaseous permeability is decreased
Solution Approach 1:
The housing is divided into a light-shielding region with through-holes and a detection region with a light-tight window. This segmentation allows gas to pass through the holes in the light-shielding region while the detection region remains light-tight, thus maintaining both gaseous permeability and detection accuracy without requiring a complete shelter.
Solution Approach 2:
The housing has different structural characteristics in different regions: the light-shielding region has holes for gas exchange, while the detection region has a light-tight window. This local quality differentiation enables the housing to block ambient light at the detection region while maintaining gas permeability through the light-shielding region, resolving the contradiction between detection accuracy and gaseous permeability.
3Reliability
If holes are formed on the housing for smoke detection, then smoke conductivity is improved, but ambient light interference increases
Solution Approach 1:
The housing is segmented into a light-shielding region with through-holes for smoke detection and a detection region with a light-tight window. This segmentation allows smoke to enter through the holes in the light-shielding region while preventing ambient light from reaching the optical detector, thus resolving the contradiction between smoke conductivity and ambient light interference.
Solution Approach 2:
The light-shielding region acts as an intermediary structure that allows smoke to pass through via its through-holes while blocking ambient light. This intermediary region resolves the contradiction by providing a path for smoke while preventing light interference at the detection region.
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
The design enhances detection accuracy and sensitivity by blocking ambient light and allowing smooth gas passage, achieving preferred smoke conductivity and gaseous permeability for improved detection performance.
Implementation Method 1
The optical detection module analyzes variation of scattering parameters resulted from gaseous matter entering the top cover through the guiding channel
Data Source
AI summary
A smoke detector includes a substrate, an optical detection module, a base and a top cover. The substrate has a ring shape region surrounding a central detection region, and a first block structure of the central detection region is protruded from the substrate and higher than an upper surface of the ring shape region. The optical detection module is disposed inside the central detection region. The base is disposed on the substrate and around the optical detection module. The base has a second block structure. The top cover is connected to the base. A lateral wall of the top cover is partly overlapped with the second block structure to form a guiding channel. The optical detection module analyzes variation of scattering parameters resulted from gaseous matter entering the top cover through the guiding channel for determining concentration of the gaseous matter.