Particle Detecting Module With Stray Light Suppression for Miniaturization
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Solution Overview
Problem
Conventional particle detecting modules face challenges in miniaturization due to complex gas-guiding paths, leading to increased thickness and difficulty in integrating them into portable devices, while maintaining detection accuracy of suspended particles.
Innovation Solution
The module incorporates an anti-scatter structure and two stray light suppression treatment structures to enhance detection accuracy, comprising an anti-scatter structure in the gas-inlet groove and stray light suppression structures in the light trapping region and gas-inlet groove, using geometry-shaped light trapping structures to minimize stray light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gas-guiding path is designed in multiple layers to guide gas flow, then the gas can be properly directed through the detection chamber, but the thickness of the module increases and miniaturization becomes difficult
Solution Approach 1:
The patent transitions from a multi-layer vertical gas-guiding structure to a planar single-layer structure with optimized gas flow paths. The gas inlet and outlet are positioned on the same plane with streamlined channels that guide gas through the detection chamber without requiring multiple stacked layers, thereby reducing module thickness while maintaining reliable gas flow guidance.
2Volume of moving object
If the module volume is reduced to make it portable and thin, then the device becomes suitable for mobile applications, but the detection accuracy of suspended particles deteriorates
Solution Approach 1:
The patent applies local quality optimization by designing specific optical path features within the compact module. The detection chamber incorporates optimized light beam paths, scattering angle control, and strategic positioning of the particle sensor to maximize detection sensitivity. The gas-guiding channels are shaped to ensure uniform particle distribution in the detection zone, maintaining high measurement precision despite the reduced overall volume.
Solution Approach 2:
The module incorporates preliminary particle focusing and distribution mechanisms within the compact gas-guiding channels. Before particles reach the detection zone, the channel geometry pre-concentrates and evenly distributes them, ensuring optimal detection conditions are established in advance within the limited space, thereby maintaining detection accuracy in the miniaturized form factor.
3Reliability
If conventional multi-layer gas-guiding structures are used, then gas flow can be controlled, but the device complexity increases and integration into portable devices becomes difficult
Solution Approach 1:
The patent merges multiple gas-guiding functions into a single integrated planar structure. The gas inlet channel, detection chamber, and outlet channel are combined in a continuous streamlined path on one layer, eliminating the need for separate multi-layer components. This integration maintains effective gas flow control while significantly reducing structural complexity and facilitating integration into portable devices.
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 design improves detection accuracy and efficiency by effectively capturing scattered light spots without distortion, allowing for a thinner and more portable particle detecting module.
Implementation Method 1
a light beam emitted from the laser component passes through the two transparent windows and enters the light trapping region
Implementation Method 2
the anti-scatter structure and the first light trapping structure and the second light trapping structure with the stray light suppression treatment structures reduce a stray light directly reflected to the particulate sensor
Implementation Method 3
the scattered light spots of the suspended particles are more easily to be received and calculated by the particulate sensor for obtaining the sizes and the concentration information of the suspended particles
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A particle detecting module is provided and includes a detection accuracy enhancing structure. The detection accuracy enhancing structure comprises an anti-scatter structure (18) and two stray light suppression treatment structures (19a, 19b). The anti-scatter structure (18) is disposed in the gas-inlet groove (14) of the base (1) corresponding to a projection area of the laser component (4). The two stray light suppression treatment structures (19a, 19b) are respectively arranged in the light trapping region (17) and the gas-inlet groove (14) corresponding to the projection area of the laser component (4). The light trapping region (17) includes the first light trapping structure (17a) with geometry shape and the second light trapping structure (17b) with geometry shape. When the light beam emitted from the laser component (4) is reflected to the light trap region (17) and the gas-inlet groove (14), the anti-scatter structure (18) and the two stray light suppression treatment structures (19a, 19b) reduce a stray light directly reflected to the particulate sensor (5), so as to enhance the detection accuracy.