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Optics Express

Optics Express

  • Editor: J. H. Eberly
  • Vol. 8, Iss. 8 — Apr. 9, 2001
  • pp: 475–480

Optics InfoBase > Optics Express > Volume 8 > Issue 8 > Page 475

Fiber-optic extrinsic Fabry-Perot interferometer strain sensor with <50 pm displacement resolution using three-wavelength digital phase demodulation

Markus Schmidt, Bernd Werther, Norbert Fuerstenau, Michael Matthias, and Tobias Melz  »View Author Affiliations


Optics Express, Vol. 8, Issue 8, pp. 475-480 (2001)
http://dx.doi.org/10.1364/OE.8.000475


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Abstract

A fiber-optic extrinsic Fabry-Perot interferometer strain sensor (EFPI-S) of ls=2.5 cm sensor length using three-wavelength digital phase demodulation is demonstrated to exhibit <50 pm displacement resolution (< 2nm/m strain resolution) when measuring the cross expansion of a PZT-ceramic plate. The sensing (single-mode downlead-) and reflecting fibers are fused into a 150/360 µm capillary fiber where the fusion points define the sensor length. Readout is performed using an improved version of the previously described three-wavelength digital phase demodulation method employing an arctan-phase stepping algorithm. In the present experiments the strain sensitivity was varied via the mapping of the arctan - lookup table to the 16-Bit DA-converter range from 188.25 µε/V (6 Volt range 1130 µε) to 11.7 µε/Volt (range 70 µε).

© Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot

ToC Category:
Research Papers

History
Original Manuscript: February 15, 2001
Published: April 9, 2001

Citation
Markus Schmidt, Bernd Werther, Norbert Fuerstenau, Michael Matthias, and Tobias Melz, "Fiber-optic extrinsic Fabry-Perot interferometer strain sensor with <50 pm displacement resolution using three-wavelength digital phase demodulation," Opt. Express 8, 475-480 (2001)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-8-8-475


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References

  1. M. Schmidt, N. F�rstenau, "Fiber-optic extrinsic Fabry-Perot interferometer sensors with three-wavelength digital phase demodulation," Opt. Lett. 24, 599 - 601 (1999) [CrossRef]
  2. T.Melz, M. Fr�vel, V.Krajenski, M.A. de la Torre, H. Hanselka, J. M. Pintado, "Modelling and control of adaptive mechanical structures", in: Gabbert, Ulrich (Eds.): Fortschritt-Berichte VDI : ser. no. 11, Schwin-gungstechnik 268, 449 - 458 (1998)
  3. K.A.Murphy, M.A. Gunther, A. M. Vengsarkar, R.O. Claus, "Quadrature phase shifted extrinsic Fabry-Perot optical fiber sensors," Opt. Lett. 16, 273-275 (1991) [CrossRef] [PubMed]
  4. V. Bhatia, K.A. Murphy, R.O. Claus, M. E. Jones, J. L. Grace, T.A. Tran, J.A. Greene, "Multiple strain state measurements using conventional and absolute optical fiber-based extrinsic Fabry-Perot interferometric strain sensors," Smart Materials Struct. 4, 240 -245 (1995) [CrossRef]
  5. T. Li, R.G.May, A. Wang, R.O. Claus, "Optical scanning extrinsic Fabry-Perot interferometer for absolute microdisplacement measurement," Appl. Opt. 36, 8858 � 8861 (1997) [CrossRef]
  6. M. Schmidt, N. F�rstenau, W. Bock, W. Urbanczyk, "Fiber-optic polarimetric strain sensor with three-wavelength digital phase demodulation," Opt. Lett. 25 1334-1336 (2000) [CrossRef]

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