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. 2014 Jan 8;119:674–682. doi: 10.6028/jres.119.029

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 4 — Indicated diameter of PMMA beads (≈ 69 µm diameter) suspended in 2P-water mixtures of varying refractive index. Standard deviations of repeat measurements are smaller than the symbol size. At the highest refractive index (n = 1.484, Δn ≈ 0.007), flow imaging results were interpreted either as fully filled circles (filled red circle) or as arcs (open red circle). The dashed vertical line indicates the point of refractive index match between the beads and the matrix liquid, based on literature values for PMMA.