Particulate Matter Sensor Using Multi-Wavelength Scattering
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Solution Overview
Problem
Current methods for measuring particulate matter in indoor air are inadequate for providing accurate and user-friendly measurements, particularly for home users, as they lack efficiency and precision in determining particle size and concentration.
Innovation Solution
An apparatus and method utilizing multiple light sources emitting different wavelengths to detect scattering patterns, with detectors to measure forward- and back-scattered light, and a processor applying a particulate matter estimation model to determine particle size and concentration, providing a histogram and warnings when thresholds are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple light sources of different wavelengths are used to measure scattering patterns, then measurement precision of particle size and concentration is improved, but device complexity increases
Solution Approach 1:
The device segments the measurement function by using multiple light sources (first light source for back-scattered light measurement, second light source for forward-scattered light measurement) and multiple detectors to measure different scattering patterns separately. This segmentation enables precise particle size and concentration measurement through wavelength-specific scattering characteristics while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The apparatus achieves multi-functionality by using the scattering pattern measurement system to simultaneously determine both particle size and concentration, and by providing multiple output formats including histograms and threshold warnings. The same core measurement mechanism serves multiple measurement purposes, improving precision without proportionally increasing complexity.
2Measurement precision
If light sources and detectors are positioned to measure both forward- and back-scattered light, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The optical measurement system is segmented into distinct functional units: a first light source positioned to measure back-scattered light, a second light source positioned to measure forward-scattered light, and corresponding detectors. This spatial segmentation of measurement functions enables comprehensive scattering pattern analysis while maintaining clear optical paths and simplified positioning requirements for each component.
3Measurement precision
If a processor applies complex estimation models to analyze scattering patterns, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system creates a digital copy of the physical measurement process through computational estimation models that simulate light scattering patterns. The processor analyzes detected scattering patterns by comparing them against pre-established models and lookup tables, transforming physical measurements into particle size and concentration data through computational rather than purely physical processes, thereby managing device complexity while maintaining precision.
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
Enables precise measurement of particulate matter size and concentration, providing users with accurate data and warnings, enhancing indoor air quality assessment and health safety.
Implementation Method 1
two or more light sources configured to respectively emit light of different wavelengths to the air received, a pattern measuring device configured to measure scattering patterns for each wavelength of light based on detecting light that is forward-scattered by the particulate matter particles and light that is back-scattered by the particulate matter particles
Data Source
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AI summary
Provided is an apparatus for measuring particulate matter, the apparatus including an air inflow device configured to receive air including particulate matter particles, two or more light sources configured to respectively emit light of different wavelengths to the air received, a pattern measuring device configured to measure scattering patterns for each wavelength of light based on detecting light that is forward-scattered by the particulate matter particles and light that is back-scattered by the particulate matter particles, and a processor configured to obtain a size of the particulate matter particles and a concentration of the particulate matter particles based on the scattering patterns for each wavelength of light.