Particle Analyzer Polarization Scattered Light Aspect Ratio
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Solution Overview
Problem
Existing methods for analyzing particle shape, such as dynamic light scattering, suffer from errors in rotational and translational diffusion coefficients, leading to unsatisfactory accuracy in calculating aspect ratio and major axis length of particles dispersed in a liquid medium.
Innovation Solution
A particle analyzer that measures the aspect ratio and major axis length by detecting polarization components in scattered light, using a polarization relationship value calculation section and axis length calculation section, which eliminates the need for rotational and translational diffusion coefficients, thereby improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If dynamic light scattering method is used to measure particle shape in dispersed liquid state, then measurement can be performed without drying particles, but measurement accuracy is reduced due to error components in rotational and translational diffusion coefficients
Solution Approach 1:
The invention extracts only the polarization relationship value (ratio of vertically polarized light intensity to horizontally polarized light intensity) from the scattered light, and uses this extracted parameter to calculate aspect ratio directly, eliminating the need to use rotational and translational diffusion coefficients that contain error components
Solution Approach 2:
The invention introduces a polarization relationship value as an intermediary parameter between light scattering measurement and aspect ratio calculation. This intermediary avoids the error-prone diffusion coefficient calculations while maintaining the ability to measure particles in dispersed liquid state
2Manufacturing precision
If aspect ratio is calculated from both rotational and translational diffusion coefficients, then particle shape parameters can be obtained, but calculation accuracy is degraded due to error components in both coefficients
Solution Approach 1:
The invention extracts only the polarization relationship value from scattered light measurements and uses this single extracted parameter to determine aspect ratio, eliminating dependence on both rotational and translational diffusion coefficients that contain error components
Solution Approach 2:
The invention changes the measurement parameter from diffusion coefficients (which have error components) to polarization relationship value (which provides more reliable aspect ratio information). This parameter change improves both accuracy and reliability of particle shape measurement
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 accurate determination of particle aspect ratio and major axis length without error components from diffusion coefficients, enhancing measurement precision and reliability.
Implementation Method 1
detecting light intensity IVH of horizontally polarized light and light intensity IVV of the vertically polarized light which are contained in scattered light caused by the irradiation
Implementation Method 2
detecting two different kinds of polarization components contained in scattered light
Data Source
AI summary
A particle analyzer is intended to accurately obtain an aspect ratio and a major axis length or a minor axis length of particles being dispersed in a dispersion medium. The particle analyzer includes a polarization relationship value calculation section to calculate a polarization relationship value whose parameter is light intensity of two kinds of polarization components, an aspect ratio calculation section to calculate an aspect ratio from a polarization relationship value already obtained by the polarization relationship value calculation section by using a relationship between the polarization relationship value and the aspect ratio, a diffusion coefficient acquisition section to acquire a diffusion coefficient indicating the behavior of the particles in a sample, and an axis length calculation section to calculate a major axis length from the aspect ratio already calculated by the aspect ratio calculation section and the diffusion coefficient already acquired by the diffusion coefficient acquisition section, by using a relationship between the diffusion coefficient, the major axis length, and the aspect ratio.