Photoelectric Smoke Sensor Reflecting Member Optical Path
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Solution Overview
Problem
Existing photoelectric smoke sensors face difficulties in accurately detecting smoke with low concentration, as the diffused light from the smoke is insufficient, leading to challenging detection scenarios.
Innovation Solution
The introduction of a reflecting member within the smoke sensor housing, which deflects and reflects inspection light to prevent direct entry into the light receiving element, thereby reducing noise and increasing the diffused light detected, enhancing the sensor's accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact housing structure is used to reduce sensor size, then the sensor can be installed in limited spaces, but the detection accuracy for low-concentration smoke deteriorates due to insufficient light diffusion path
Solution Approach 1:
The patent introduces a reflecting member to create a folded optical path within the compact housing. By reflecting inspection light multiple times between the light emitting element, light receiving element, and reflecting member, the effective light diffusion path is extended in a multi-dimensional manner without increasing the physical volume of the sensor. This allows sufficient light diffusion for low-concentration smoke detection while maintaining a compact form factor suitable for installation in limited spaces.
2Adaptability or versatility
If the housing is made compact to reduce overall sensor dimensions, then installation flexibility improves, but the optical path length for smoke detection is reduced, worsening detection sensitivity
Solution Approach 1:
The reflecting member creates a three-dimensional folded optical path that maximizes the light diffusion distance within the compact housing. The inspection light reflects between the light emitting element, light receiving element, and reflecting member, effectively extending the detection path length without increasing the housing dimensions. This maintains installation flexibility while improving detection sensitivity for low-concentration smoke.
3Device complexity
If inspection light is emitted directly toward the light receiving element, then the structure is simplified, but direct light enters the receiver causing noise that reduces detection accuracy
Solution Approach 1:
The reflecting member acts as an intermediary element that redirects inspection light through a controlled path. Instead of direct emission toward the light receiving element, the light is reflected by the reflecting member to create a triangular optical path. This intermediary reflection prevents direct light from entering the receiver, eliminating noise while maintaining relatively simple device structure.
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
This configuration allows for higher accuracy in smoke detection while maintaining a compact size, effectively addressing the limitations of prior-art sensors by minimizing noise and increasing the detected diffused light.
Implementation Method 1
the light receiving element 9 receives diffused light which is the inspection light diffused by having hit the smoke and detects the smoke
Implementation Method 2
a reflecting member provided in the housing and deflecting and reflecting the inspection light emitted from the light emitting element so as not to enter the light receiving element
Data Source
AI summary
A photoelectric smoke sensor capable of detecting smoke with high accuracy is provided.The present invention relates to the photoelectric smoke sensor which detects smoke flowing into a housing by light. The present invention is provided with a light emitting element provided by being faced with a detection region in the housing and emitting inspection light to the detection region, a light receiving element provided at a position shifted from an optical path of the inspection light of the light emitting element by being faced with the detection region and receiving diffused light which is the inspection light having hit the smoke and diffused, so as to detect the smoke, and a reflecting member provided in the housing and deflecting and reflecting the inspection light emitted from the light emitting element so as not to enter the light receiving element.