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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 36, Iss. 34 — Dec. 1, 1997
  • pp: 8999–9004

Study of the refractive index of microscopic glass beads by light-refraction analysis

F. Sarcinelli, R. Pizzoferrato, and F. Scudieri  »View Author Affiliations


Applied Optics, Vol. 36, Issue 34, pp. 8999-9004 (1997)
http://dx.doi.org/10.1364/AO.36.008999


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Abstract

The refractive index of submillimeter glass beads has been measured by means of a novel, to our knowledge, procedure with reference liquids that does not require close index matching and therefore avoids the use of toxic compounds for high-index glasses (i.e., <i>n</i> ≥ 1.8). The method is based on the analysis of the light refracted by a monolayer of beads in comparison with ray-tracing simulations. For the three different types of glass beads investigated a satisfactory fit is achieved by the assumption of a radial variation of the refractive index inside the beads. This is ascribed to the tensile and compressive stresses originating inside the beads during rapid solidification of the glass.

© 1997 Optical Society of America

Citation
F. Sarcinelli, R. Pizzoferrato, and F. Scudieri, "Study of the refractive index of microscopic glass beads by light-refraction analysis," Appl. Opt. 36, 8999-9004 (1997)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-36-34-8999


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References

  1. H. Lein and R. S. Tankin, “Natural convection in porous media-I. Nonfreezing,” Int. J. Heat Mass Transfer 35, 175–186 (1992).
  2. N. H. Hartshorne and A. Stuart, Crystals and the Polarizing Microscope (Arnold, London, 1970), p. 561.
  3. R. P. Cargille Laboratories, Inc., “Optical liquids precaution sheet,” RI-SS-PS-554a (Cedar Grove, N.J., 1995).
  4. See, for example, Society of Automotive Engineers information report J784a (SAE, Warrendale, Pa., 1971), pp. 3–11.
  5. For a comprehensive review with recent developments and applications of the Christiansen effect see, for example, K. Balasubramanian, M. R. Jacobson, and H. A. Macleod, “New Christiansen filters,” Appl. Opt. 31, 1574–1587 (1992).

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