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Optics Letters

Optics Letters


  • Vol. 25, Iss. 18 — Sep. 15, 2000
  • pp: 1334–1336

Fiber-optic polarimetric strain sensor with three-wavelength digital phase demodulation

Markus Schmidt, Norbert Fürstenau, Wojtek Bock, and Waclaw Urbanczyk  »View Author Affiliations

Optics Letters, Vol. 25, Issue 18, pp. 1334-1336 (2000)

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A fiber-optic polarimetric strain sensor of lS=10-cm sensing length with three-wavelength passive quadrature digital phase demodulation is investigated. The demodulation unit uses a superluminescent diode light source with narrow-band interference filters in front of the photodiodes and real-time processing of the interference intensities by an arctan-phase-stepping algorithm. Quasi-static strain sensing is performed during slow periodic compression of a composite reinforced plastic rod with a sensor glued to its surface. The measured displacement sensitivity of δΦ/δl=125 mrad/μm, with a resistive strain gauge as a reference, agrees well with the value of 119 mrad/μm previously determined by fringe-distance measurement [Bock et al., Pure Appl. Opt. 5, 125 (1996)]. Despite a coherence-limited fringe contrast of only a few percent, a linearity of the phase–strain characteristic of the order of 1% and a strain resolution of 2.5με are demonstrated.

© 2000 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2920) Instrumentation, measurement, and metrology : Homodyning
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

Markus Schmidt, Norbert Fürstenau, Wojtek Bock, and Waclaw Urbanczyk, "Fiber-optic polarimetric strain sensor with three-wavelength digital phase demodulation," Opt. Lett. 25, 1334-1336 (2000)

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  1. W. J. Bock, T. R. Wolinski, and T. A. Eftimov, Pure Appl. Opt. 5, 125 (1996).
  2. W. J. Bock and T. A. Eftimov, Opt. Lett. 18, 1979 (1993).
  3. J. J. Guerin, M. Lequime, E. Toppani, M. Leygonie, and D. Chauvel, Proc. SPIE 2361, 224 (1994).
  4. W. J. Bock and W. Urbanczyk, in Optical Fiber Sensors, Vol. 16 of 1997 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1997), pp. 479–483.
  5. N. Fürstenau, M. Schmidt, W. Bock, and W. Urbanczyk, Appl. Opt. 37, 663 (1998).
  6. K. Creath, in Progress in Optics XXVI, E. Wolf, ed. (Elsevier, Amsterdam, 1988), p. 364.
  7. M. Schmidt and N. Fürstenau, Opt. Lett. 24, 599 (1999).

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