Particle Characterization via Optical and Aerodynamic Diameter Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current particle characterization methods are limited to simple diameter measurements, requiring cumbersome instruments and skilled operators, and fail to provide comprehensive information about particle characteristics like shape and density in a cost-effective and compact manner.
Innovation Solution
An apparatus and method utilizing a single optical analysis system with a long measurement zone and accelerating flow to determine both effective optical and aerodynamic diameters, along with shape and density information, by measuring transit time and light intensity, enabling differentiation between particle types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If multiple measurement techniques are connected in series to obtain comprehensive particle information, then particle characterization capability is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent combines multiple measurement techniques (optical scattering, time-of-flight, light absorption) into a single integrated instrument. The particle analysis system measures optical diameter, aerodynamic diameter, and composition simultaneously by processing different signals from the same particle sample, eliminating the need for separate instruments connected in series.
Solution Approach 2:
The particle analysis system is designed as a universal instrument capable of performing multiple functions: measuring optical diameter via light scattering, determining aerodynamic diameter through time-of-flight in an accelerating flow, and analyzing composition using light absorption techniques. This multi-functional approach replaces multiple specialized instruments.
2Loss of information
If multiple measurement techniques are connected in series to obtain comprehensive particle information, then particle characterization capability is improved, but space requirements increase
Solution Approach 1:
The patent combines multiple measurement techniques (optical scattering, time-of-flight, light absorption) into a single integrated instrument. The particle analysis system measures optical diameter, aerodynamic diameter, and composition simultaneously by processing different signals from the same particle sample, eliminating the need for separate instruments connected in series.
3Measurement precision
If traditional particle sizing techniques are used to measure equivalent diameter, then diameter measurement is achieved, but additional particle characteristics (shape, density) cannot be obtained
Solution Approach 1:
The patent measures multiple parameters beyond the basic diameter measurement. In addition to optical and aerodynamic diameters, the system measures light absorption characteristics to determine particle composition, and uses the ratio of diameters to infer shape factors and density. This excessive measurement approach ensures all desired particle characteristics are obtained.
Solution Approach 2:
The patent utilizes changes in optical parameters (scattering intensity, absorption coefficient) as particles traverse the measurement zone to extract multiple characteristics. By monitoring how these parameters change with particle transit time and position, the system derives diameter, shape, density, and composition information from a single measurement sequence.
4Measurement precision
If comprehensive particle analysis is performed using multiple techniques, then particle characterization accuracy is improved, but operation complexity and skilled operator requirement increase
Solution Approach 1:
The particle analysis system automatically processes all measurements and calculations without requiring skilled operators. The instrument self-calibrates using reference particles, automatically computes optical and aerodynamic diameters from measured signals, and generates particle size distributions and composition analysis through integrated software processing.
Solution Approach 2:
The system incorporates feedback mechanisms where measured particle characteristics are used to automatically adjust measurement parameters and calibration factors. The instrument monitors signal quality and adjusts integration times, gain settings, and flow rates to optimize measurements, reducing the need for operator intervention and expertise.
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 accurate characterization of particles with multiple parameters, including type and composition, in a low-cost, compact setup, facilitating portable sensors for quick and efficient analysis.
Implementation Method 1
optical particle sensing approaches are for example known based on optical scattering
Implementation Method 2
An accelerating flow is provided in the measurement zone
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
An apparatus is provided for determining particle characteristics, in which a flow path is generated containing particles to be analyzed. A light detection system detecting light received from a measurement zone which has been scattered by the particles. A time duration for which a particle remains in the measurement zone is measured to determine an effective aerodynamic particle diameter and a peak detected received light intensity is measured to determine an effective optical particle diameter. A further particle parameter is also obtained relating to the shape and/or density of the particle. This approach enables more information than only a particle size to be obtained using a single-stage optical analysis system. The additional information may be used to characterize the particles more accurately.