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  • Vol. 28, Iss. 23 — Dec. 1, 2003
  • pp: 2297–2299

Evanescent-wave infrared spectroscopy with flattened fibers as sensing elements

Y. Raichlin, L. Fel, and A. Katzir  »View Author Affiliations


Optics Letters, Vol. 28, Issue 23, pp. 2297-2299 (2003)
http://dx.doi.org/10.1364/OL.28.002297


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Abstract

Fiber-optic evanescent-wave spectroscopy (FEWS) is a novel method for measuring the absorption spectra of samples in contact with a segment of an optical fiber that serves as a sensing element. We used a cylindrical IR-transmitting AgClBr fiber whose central section, of length <i>L</i> , was flattened to a thickness <i>d</i> . This section was used as the FEWS sensing element. Our theoretical work predicted that the signals obtained in FEWS measurements should be linearly dependent on <i>L</i> and inversely proportional to <i>d</i> . Decreasing the thickness can significantly increase its sensitivity of the sensor. These theoretical results were verified experimentally by measurements of methanol and water.

© 2003 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms

Citation
Y. Raichlin, L. Fel, and A. Katzir, "Evanescent-wave infrared spectroscopy with flattened fibers as sensing elements," Opt. Lett. 28, 2297-2299 (2003)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-28-23-2297


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