Photon Ensemble Correlation Spectroscopy for Ultrafast Particle Dynamics
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Solution Overview
Problem
Conventional particle size analyzers based on dynamic light scattering require long measurement times and are limited by multi-scattering effects in high concentration samples, leading to inaccurate and time-consuming data collection.
Innovation Solution
The method employs photon ensemble correlation spectroscopy, utilizing low coherence interference to collect dynamic scattered light signals in parallel across multiple dimensions, forming sample ensembles to analyze time correlations and detect particle dynamics, thereby reducing multi-scattering and increasing measurement efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional dynamic light scattering measurement is used to ensure statistical reliability, then measurement accuracy is improved, but measurement time increases significantly
Solution Approach 1:
The patent divides the measurement process into multiple independent spatial sampling volumes along the optical axis. Each sampling volume collects scattered light signals independently, providing multiple parallel statistical samples. This segmentation allows the system to achieve reliable statistical results faster by simultaneously analyzing multiple spatial regions rather than sequentially sampling over time.
Solution Approach 2:
The patent transitions from temporal-mode measurement to spatial-mode measurement by establishing multiple sampling volumes along the optical axis (depth direction). Instead of collecting statistical samples over a long time period, the system collects spatial samples from different depths simultaneously, converting the time dimension into a spatial dimension for statistical analysis.
2Measurement precision
If photon cross correlation spectroscopy is used for high concentration samples, then multi-scattering effects are reduced, but device complexity and cost increase
Solution Approach 1:
The patent applies spatial gating to selectively detect scattered light from specific local regions (sampling volumes) along the optical axis. By focusing detection on localized spatial regions rather than collecting light from the entire sample path, the system reduces the impact of multi-scattering events while maintaining simplicity comparable to conventional PCS devices.
3Reliability
If sufficient independent samples are collected for statistical correlation calculation, then reliability of results is improved, but measurement time increases
Solution Approach 1:
The patent segments the detection space into multiple independent sampling volumes along the optical axis, each providing independent statistical samples. This spatial segmentation enables the system to collect sufficient samples for reliable correlation calculation much faster than temporal sampling, as all spatial samples are acquired simultaneously rather than sequentially over time.
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 ultrafast particle dynamics measurement, reducing single measurement time to milliseconds, enhancing accuracy and reliability by analyzing complex-valued signals across multiple dimensions, and enabling rapid detection of particle size and viscosity information.
Implementation Method 1
The method employs photon ensemble correlation spectroscopy, utilizing low coherence interference to collect dynamic scattered light signals in parallel across multiple dimensions
Implementation Method 2
conventional particle size analyzers based on dynamic light scattering require long measurement times and are limited by multi-scattering effects in high concentration samples
Implementation Method 3
there is a Doppler shift in the frequency of the scattered light of the particle relative to incident light due to the Brownian dynamic
Implementation Method 4
there is a Doppler shift in the frequency of the scattered light of the particle relative to incident light due to the Brownian dynamic
Data Source
AI summary
An apparatus of ultrafast particle dynamics measurement based on photon ensemble correlation spectroscopy include steps of: dispersing a particle sample to be detected; establishing a plurality of sampling volumes, and collecting dynamic scattered light signals in parallel; and constructing sample ensembles based on scattered signals of the sampling volumes, analyzing time correlations between the sample ensembles, and detecting particle dynamic characteristics. A period for a single measurement of particles according to the method can be in the range of several milliseconds to several tens of milliseconds, which is conducive to real-time detection. More accurate and reliable correlation characterization can be obtained by combining the detected complex-valued scattered signals with both amplitude and phase information. Furthermore, the particle detection is able to be spatially resolved, so as to achieve spatially resolved particle dynamic characteristics.