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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • 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)
http://dx.doi.org/10.1364/OL.25.001334


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Abstract

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

Citation
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)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-25-18-1334

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