Optical Absorbance Air Quality Assessment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional indoor air quality monitoring systems lack accuracy in determining particle refractive indices, shape, size distribution, humidity, and material composition, leading to poor accuracy in particle size distribution and mass accumulation measurements.
Innovation Solution
The method involves using electromagnetic radiation absorbance measurements of aerosol material captured on a filter to determine aerosol material type, composition, mass loading, and particle size, thereby improving air quality assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional light scattering methods are used for air quality monitoring, then the system is simple and low-cost, but the measurement precision of particle size distribution and mass accumulation is poor
Solution Approach 1:
The patent replaces conventional light scattering methods with optical absorbance measurement. This substitution enables accurate determination of particle refractive indices, material composition, and mass accumulation without requiring complex multi-parameter measurement systems. The absorbance method directly provides information about particle properties that scattering methods cannot reliably determine.
Solution Approach 2:
The patent changes the measurement parameter from light scattering intensity to optical absorbance. This parameter change allows for accurate measurement of particle size distribution and mass accumulation by measuring the attenuation of light intensity through the aerosol sample, which directly correlates with particle concentration and optical properties.
2Measurement precision
If research grade instruments are used for aerosol composition analysis, then the measurement precision is high, but the device complexity and cost increase significantly
Solution Approach 1:
The patent creates a multi-functional air quality monitoring system that performs aerosol composition analysis, particle size measurement, and mass accumulation detection using a single optical absorbance measurement approach. This eliminates the need for multiple specialized instruments while maintaining high measurement precision across all parameters.
Solution Approach 2:
The patent adapts the optical absorbance measurement principle from research grade aerosol analysis instruments and applies it to a compact, field-deployable air quality monitoring device. This allows the system to achieve research-grade measurement precision in a simplified, cost-effective form factor suitable for indoor air quality monitoring.
3Reliability
If conventional air quality monitors are used, then the device complexity is low, but the reliability of material composition information is insufficient
Solution Approach 1:
The patent replaces conventional light scattering-based monitoring with optical absorbance measurement, which provides reliable material composition information by measuring the wavelength-dependent attenuation of light. This substitution enables the system to determine refractive indices and identify particle materials with high reliability while maintaining system simplicity.
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 provides a more accurate and cost-effective method for determining air quality by identifying aerosol material composition, filter mass loading, and median particle size, enabling better filter replacement timing and improved air quality monitoring.
Implementation Method 1
aerosol material captured on the filter
Implementation Method 2
electromagnetic radiation absorbance measurements of aerosol material captured on the filter
Implementation Method 3
Absorbance spectra may provide differentiation between various aerosol particle materials captured on a filter
Data Source
AI summary
A method and system of determining air quality are disclosed. In examples, a method comprises identifying one or more aerosol particle types based on an absorbance spectra of aerosol particles captured on a filter and determining a mass concentration of each of the one or more aerosol particle types based on the absorbance spectra and the aerosol particle type. The method further comprises detecting a median particle size of each of the one or more aerosol particle types based on a rate of change of the absorbance spectra and the aerosol particle type. The method further comprises determining an air quality metric based on the identified one or more aerosol particle types, the determined mass concentration of each of the one or more aerosol particle types, and the determined median particle size of each of the one or more aerosol particle types.