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Optical Engineering • Open Access

Temperature-compensated optical fiber Michelson refractometer
Author(s): Adriaan Van Brakel; Pieter L. Swart

Paper Abstract

Fiber optic interferometric refractometers usually possess large temperature sensitivities, especially those based on individual long-period gratings. This work introduces a compound-cavity Michelson interferometer that uses mode coupling in a long-period grating to establish the two optical paths in a single fiber, and therefore presents a compact sensor for in vivo refractive index measurement. Successful operation of the athermal refractometer was demonstrated experimentally by comparing its phase shift due to temperature-dependent changes of the refractive index of the analyte with refractive index readings from a temperature-controlled Abbe refractometer.

Paper Details

Date Published: 1 February 2005
PDF: 2 pages
Opt. Eng. 44(2) 020504 doi: 10.1117/1.1850746
Published in: Optical Engineering Volume 44, Issue 2
Show Author Affiliations
Adriaan Van Brakel, Univ. of Southampton (United Kingdom)
Pieter L. Swart, Rand Afrikaans Univ. (South Africa)

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