Particulate Sensor UV Fluorescence Particle Identification
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Solution Overview
Problem
Current particulate matter (PM) sensors cannot identify the type of particles, such as biomatter, which are important due to their potential as allergens or health risks, as they do not differentiate between various types of pollutants based on their interactions with light.
Innovation Solution
The use of a particulate sensor that exposes airborne particles to short-wavelength light, such as UV light, causing biological matter to fluoresce. The sensor measures the light interactions at a high sampling rate and employs artificial intelligence techniques to analyze the measurements, including fluorescence patterns, to distinguish different biological and non-biological particle types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional PM sensors use lasers to irradiate particles and collect scattered light, then particle detection is achieved, but particle type identification is not possible
Solution Approach 1:
The patent segments the light measurement process into multiple wavelength channels, measuring scattered light at different wavelengths separately. This allows the system to capture spectral information that characterizes different particle types, enabling identification while maintaining the basic scattering detection approach
Solution Approach 2:
The patent changes the measurement parameter from simple light intensity to spectral distribution across multiple wavelengths. By measuring how particles scatter light at different wavelengths, the system gains additional information about particle composition and type without requiring fundamentally new detection physics
2Measurement precision
If short-wavelength light is used to cause fluorescence in biomatter particles, then particle type identification is enabled, but device complexity increases
Solution Approach 1:
The patent makes the light source serve multiple functions: it acts as both the excitation source for fluorescence and the measurement source for scattered light detection. The same optical path and detectors are used for both fluorescence and scattering measurements, eliminating the need for separate excitation sources and reducing overall system complexity
Solution Approach 2:
The patent combines fluorescence detection and scattered light measurement into a single integrated optical system. By merging these two detection modes that use the same light source and detection path, the system achieves particle type identification through multiple mechanisms without proportionally increasing device complexity
3Measurement precision
If high sampling rate measurements are taken for each particle, then detailed particle characterization is achieved, but data processing requirements increase
Solution Approach 1:
The patent applies partial action by selecting specific wavelength channels and measurement parameters that are most discriminative for particle type identification. Rather than processing all possible spectral data equally, the system focuses on the most informative subsets, reducing processing complexity while maintaining identification accuracy
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 approach allows for the identification and differentiation of various particulate types, including biomatter, from inert particles, providing critical information on potential health risks and allergens present in the air.
Implementation Method 1
The use of a particulate sensor that exposes airborne particles to short-wavelength light, such as UV light, causing biological matter to fluoresce
Implementation Method 2
Current PM sensors commonly use lasers to irradiate particles suspended in an air sample and then collect scattered light to detect or measure the suspended particles
Data Source
AI summary
Particulate sensing systems or processes identify particulates suspended in an air sample by irradiating the air sample with UV light and measuring light from individual particles in the air sample. Two photodiodes having different wavelength sensitivity may be used to measure the fluorescent light emitted from a single particle, and a type of the particle may be identified using outputs from photodiodes. Repeating the process for multiple particles may produces distributions that further distinguish or identify particulate types.