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Applied Optics

Applied Optics


  • Vol. 40, Iss. 21 — Jul. 20, 2001
  • pp: 3518–3524

Differential optical fiber refractometer based on a path-matching differential interferometer with temperature compensation

Yu-Lung Lo and Chin-Ho Chuang  »View Author Affiliations

Applied Optics, Vol. 40, Issue 21, pp. 3518-3524 (2001)

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We present a new approach for the development of a highly stable optical fiber refractometer based on a path-matching differential interferometer. Exploiting a single-channel phase tracker and new synthetic heterodyne demodulations, one can eliminate the thermal drift on a piezoelectric transducer stack as a phase modulator by subtraction. A transducer in a differential Fabry–Perot refractometer is designed to compensate for the thermal effects not only from thermal expansion but also from the thermo-optic effect. The experimental data show that the refractive-index change in the sensing system can be kept at a level of approximately 5 × 10-4 without serious variations for a 1-h period of long-term monitoring associated with a temperature variation of from 25 to 50 °C. Accordingly, the proposed new system can be easily implemented and used as a long-term monitoring system for medical care applications such as monitoring patients during drug injection.

© 2001 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5710) Instrumentation, measurement, and metrology : Refraction

Original Manuscript: July 24, 2000
Revised Manuscript: February 22, 2001
Published: July 20, 2001

Yu-Lung Lo and Chin-Ho Chuang, "Differential optical fiber refractometer based on a path-matching differential interferometer with temperature compensation," Appl. Opt. 40, 3518-3524 (2001)

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