Light-Scattering Particle Sizing for Accurate Optical Modulus Estimation
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Solution Overview
Problem
Existing methods for determining viscoelastic modulus using Laser Speckle Rheology (LSR) neglect the influence of particle size, leading to inaccurate characterization of materials, particularly in biological fluids and industrial polymers.
Innovation Solution
A system and method that determines the average size of light-scattering particles within a material by analyzing the azimuth-angle dependence of diffuse reflectance profiles, using a single optical system to improve the accuracy of viscoelastic modulus estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If particle size is neglected in LSR analysis, then the measurement process remains simple and quick, but the accuracy of viscoelastic modulus estimation deteriorates
Solution Approach 1:
The patent combines particle size determination and viscoelastic modulus measurement into a single integrated LSR analysis process. Both parameters are extracted simultaneously from the same speckle pattern data through mathematical modeling, eliminating the need for separate measurement procedures and additional equipment.
Solution Approach 2:
The LSR system is enhanced to perform multiple functions: it simultaneously characterizes both particle size and viscoelastic properties from the same optical measurements. The mathematical framework allows extraction of multiple material parameters from a single experimental setup and data set.
2Measurement precision
If particle size is taken into account, then the accuracy of material characterization is improved, but the complexity of analysis increases
Solution Approach 1:
The patent develops and applies a mathematical model that accounts for particle size effects in advance of actual measurements. Pre-computed lookup tables and calibration curves are generated based on theoretical considerations, allowing direct extraction of accurate results during experimental analysis without complex real-time calculations.
Solution Approach 2:
The patent replaces complex mechanical analysis with optical measurement and mathematical modeling. By using light scattering patterns and computational algorithms, the system achieves accurate material characterization without requiring complex mechanical testing apparatus or procedures.
3Measurement precision
If additional measurements are performed to determine particle size, then accuracy is improved, but the measurement time increases
Solution Approach 1:
The patent merges particle size determination and viscoelastic modulus measurement into a single simultaneous process. Both parameters are extracted from the same speckle pattern data collected during one measurement session, eliminating the need for sequential measurements and reducing total analysis time.
Solution Approach 2:
The LSR system automatically extracts both particle size and viscoelastic properties from the measured data through built-in mathematical algorithms. The system performs self-characterization without requiring additional external measurements or separate analytical procedures, making the process efficient and self-contained.
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
Accurately quantifies viscoelastic properties by integrating particle size determination into the LSR process, enhancing precision and accuracy without requiring additional measurements or interrupting the LSR procedure.
Implementation Method 1
analysis of electromagnetic radiation that has interacted with the sample... analyzing the azimuth-angle dependence of diffuse reflectance profiles... size of light-scattering particles
Data Source
Figure 1
Figure 2A~2D
Figure 2E~2F
AI summary
System and method for determining a viscoelastic modulus of a sample using optical data acquired with an optical data acquisition portion including an optical detector configured to receive light, that has been delivered to the sample by an optical illumination portion and that has interacted with the sample, the optical data representing time evolution of a speckle associated with light-scattering particles of the sample, whereby an average size of the light-scattering particles is determined based on an angle-dependent pattern of a diffuse remittance profile (DRP) derived from the optical data, and a value of mean square displacement (MSD) of said light-scattering particles and the viscoelastic modulus of the sample is calculated from the acquired optical data, said MSD being a function of said size.