NDLI: Refractive Index Matching With Distortion Measurements in a Bed of Irregularly Packed Spheres

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Vishal, A. Patil James, A. Liburdy
Copyright Year	2010
Abstract	Experimental flow visualization in porous media is often conducted using optical techniques such as PIV and PTV for velocity field estimation and LIF for concentration field measurements. The porous bed is made optically accessible to laser light and imaging by matching refractive indices of the liquid phase to that of the solid matrix, including the channel walls. The methods most commonly employed to match the refractive indices have been to maximize the transmitted intensity through the bed or to rely on refractometers for measurement of the liquid and solid phases. Refractometers with sensitivity of 0.001 could still cause refraction problems in a porous bed, while accuracy and sensitivity of transmission based methods are limited by the camera resolution and noise scattered by impurities and stray light caused by reflections at interfaces. Both these methods fail to provide uncertainty estimates for particle position determination due to slight refractive index mismatching. This work presents a method for assessing the matching of refractive indices that relies on measuring distortion of a target when imaged through a porous bed. The target used is a grid of 250 μm dots irradiated with light at the necessary wavelength at which refractive indices are to be matched. Two principle types of distortion are quantified, distortion of the image centroid due to interface refraction and intensity distortion within the image for index mismatching as low as 0.0005.
Sponsorship	Fluids Engineering Division
Starting Page	2785
Ending Page	2795
Page Count	11
File Format	PDF
ISBN	9780791849484
DOI	10.1115/FEDSM-ICNMM2010-30571
e-ISBN	9780791838808
Volume Number	ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C
Conference Proceedings	ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels
Language	English
Publisher Date	2010-08-01
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Noise (sound) Uncertainty Lasers Refractive index Refraction Imaging Particulate matter Porous materials Flow visualization Reflection Resolution (optics) Wavelength
Content Type	Text
Resource Type	Article

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