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Influence of sample pool on interference pattern in defocused interferometric particle imaging.

Hongxia Zhang¹, Ye Zhou¹, Jing Liu¹

¹College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China.

The Review of Scientific Instruments

|May 1, 2017

Summary

This summary is machine-generated.

Two sample pool layouts for interferometric particle imaging (IPI) were analyzed. Layout II, with the sample pool surface perpendicular to scattered light, produces circular interference patterns, making it more suitable for IPI systems.

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Area of Science:

Optical physics
Particle imaging velocimetry

Background:

Particles are ubiquitous in scientific experiments.
Accurate particle characterization in liquids requires optimized sample pool configurations.
Defocused interferometric particle imaging (IPI) is a technique sensitive to optical path variations.

Purpose of the Study:

To evaluate two distinct sample pool orientations for defocused interferometric particle imaging (IPI).
To determine the optimal sample pool layout for achieving accurate circular interference patterns in IPI.
To analyze the impact of sample pool tilt on interference pattern ellipticity.

Main Methods:

Simulation of particle spot shapes using ZEMAX ray-tracing software for two sample pool layouts.
Analysis of interference pattern symmetry (circular vs. elliptical) under different defocus conditions.
Experimental validation of simulation results.

Main Results:

Layout I (surface perpendicular to incident light) resulted in elliptical interference patterns due to asymmetric light refraction.
Layout II (surface perpendicular to scattered light) maintained light symmetry, yielding circular interference patterns.
The relative error in axis ratio for Layout I was within 9.2% across various defocus distances.

Conclusions:

Layout II is demonstrably more suitable for defocused interferometric particle imaging (IPI) systems.
Maintaining light symmetry through proper sample pool orientation is critical for accurate IPI measurements.
Experimental results align with theoretical simulations, confirming the superiority of Layout II.