Aspherical Mirror Aberration for Micro Particle Detection Accuracy
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Solution Overview
Problem
Conventional micro object detection apparatuses using converging mirrors face challenges in accurately detecting polarized light components due to changes in polarization direction and reflectance, leading to reduced accuracy in detecting micro particulate matter and pollen, and suffer from erroneous counting of particles due to light blocking effects.
Innovation Solution
The apparatus employs an aspherical second converging mirror that generates aberration, improving the efficiency and accuracy of scattered light collection and detection by dispersing focal points, thereby reducing light blocking and miscounting of particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a converging mirror is used to collect scattered light, then the light collection efficiency is improved, but the polarization direction changes and reflectance varies causing reduced detection accuracy
Solution Approach 1:
The patent extracts the polarized light detection function from the light collection function by using two separate optical systems: one for collecting scattered light and another for detecting polarized light components, thereby avoiding the interference of mirror reflection on polarization measurement
Solution Approach 2:
The detection system is segmented into multiple independent optical paths: a light collection optical system using converging mirrors, and a polarized light detection optical system using a polarization beam splitter and detectors, allowing each system to optimize its function without interfering with the other
2Device complexity
If a single optical system is used for both light collection and polarized light detection, then the device complexity is reduced, but the detection accuracy of both functions deteriorates
Solution Approach 1:
The patent creates a multi-functional integrated detection apparatus that combines particle detection, light collection, and polarized light analysis functions within a single device structure, using coordinate transformation to enable comprehensive particle characterization without requiring multiple separate instruments
3Ease of manufacture
If conventional optical systems are used, then the manufacturing cost is reduced, but the ability to detect both micro particulate matter and pollen is compromised
Solution Approach 1:
The patent changes the detection parameters by measuring both the intensity of scattered light and the polarization state of scattered light, enabling differentiation between particle types (micro particulate matter versus pollen) based on their distinct optical properties without requiring separate detection 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 configuration enhances the detection efficiency and accuracy of micro particles by effectively directing scattered light to the reception element and minimizing erroneous particle counting, improving the measurement of number and weight concentrations.
Implementation Method 1
an aspherical second converging mirror that generates aberration, improving the efficiency and accuracy of scattered light collection and detection by dispersing focal points
Implementation Method 2
the scattered light is reflected in an oblique direction by the converging mirror
Implementation Method 3
irradiates with light a space in which suspended micro particulate matter (hereinafter referred to as 'particle(s)') such as pollen or dust exists, detects scattered light generated at that time
Data Source
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AI summary
A micro object detection apparatus comprising: a first optical system (52a) that includes a first reflection region (103), a second reflection region (104), and a first light reception element (6), and directs scattered light scattered when irradiation light hits a particle, to the first light reception element (6), by reflecting the scattered light by the first reflection region (103) and the second reflection region (104); and a second optical system (52b) that receives the scattered light, wherein the scattered light is directed to the first light reception element (6) by providing a first passage region (H) in the second reflection region (104) and is directed to the second optical system (52b) by providing a second passage region (AP) in the first reflection region (103), and the second passage region (AP) is located to face the first passage region (H).