Measurement of the Refractive Index of Glass Fibers by the Christiansen-Shelyubskii Method

Abstract

The Christiansen principle was employed to measure the refractive index of borosilicate glass fibers (13-41 μm diameter) over the visible range. The refractive index for glass fibers at 589.3 nm was measured by temperature and wavelength scan and values obtained were in close agreement. The refractive index for glass fibers as a function of wavelength was measured to an accuracy of < 10-4. The uniformity of the refractive index for a bundle of fibers of slightly different diameter was calculated using the modified Shelyubskii method and compared to experimental values. Theoretical calculations of the transmission by the present work suggest that, for high optical clarity and transmission of Christiansen cell (or transparent composite consisting of glass fiber and polymer), the refractive index must be controlled to the fifth decimal place. For example, the maximum transmission of a fiber/liquid mixture cell at 25°C can increase from 89 to 97% when the standard deviation is reduced from 13 × 10-5 to 9 × 10-5. © 1997 Elsevier Science B.V.

Department(s)

Materials Science and Engineering

Second Department

Chemistry

International Standard Serial Number (ISSN)

0022-3093; 1873-4812

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1997 Elsevier, All rights reserved.

Publication Date

01 Jan 1997

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