A high sensitivity refractometer based upon a long period grating Mach-Zehnder interferometer

Thomas D.P. Allsop, R. Reeves, David J. Webb, Ian Bennion, Ron Neal

Research output: Contribution to journalArticle

Abstract

A low cost interrogation scheme is demonstrated for a refractometer based on an in-line fiber long period grating (LPG) Mach–Zehnder interferometer. Using this interrogation scheme the minimum detectable change in refractive index of ?n ~ 1.8×10-6 is obtained, which is the highest resolution achieved using a fiber LPG device, and is comparable to precision techniques used in the industry including high performance liquid chromatography and ultraviolet spectroscopy.
Original languageEnglish
Pages (from-to)1702-1705
Number of pages4
JournalReview of scientific instruments
Volume73
Issue number4
DOIs
Publication statusPublished - Apr 2002

Bibliographical note

Copyright (2002) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Allsop, Thomas D.P.; Reeves, R.; Webb, David J.; Bennion, Ian and Neal, R. (2002). A high sensitivity refractometer based upon a long period grating Mach-Zehnder interferometer. Review of Scientific Instruments, 73 (4), pp. 1702-1705 and may be found at http://rsi.aip.org/resource/1/rsinak/v73/i4/p1702_s1.

Keywords

  • interrogation scheme
  • refractometer
  • an in-line fiber long period grating
  • Mach–Zehnder interferometer
  • high performance liquid chromatography
  • ultraviolet spectroscopy

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