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Optics Letters

Optics Letters


  • Vol. 24, Iss. 9 — May. 1, 1999
  • pp: 599–601

Fiber-optic extrinsic Fabry–Perot interferometer sensors with three-wavelength digital phase demodulation

Markus Schmidt and Norbert Fürstenau  »View Author Affiliations

Optics Letters, Vol. 24, Issue 9, pp. 599-601 (1999)

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A three-wavelength-based passive quadrature digital phase-demodulation scheme has been developed for readout of fiber-optic extrinsic Fabry–Perot interferometer vibration, acoustic, and strain sensors. This scheme uses a superluminescent diode light source with interference filters in front of the photodiodes and real-time arctan calculation. Quasi-static strain and dynamic vibration sensing with up to an 80-kHz sampling rate is demonstrated. Periodic nonlinearities owing to dephasing with increasing fringe number are corrected for with a suitable algorithm, resulting in significant improvement of the linearity of the sensor characteristics.

© 1999 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2920) Fiber optics and optical communications : Homodyning
(060.5060) Fiber optics and optical communications : Phase modulation
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

Markus Schmidt and Norbert Fürstenau, "Fiber-optic extrinsic Fabry–Perot interferometer sensors with three-wavelength digital phase demodulation," Opt. Lett. 24, 599-601 (1999)

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