Abstract
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
Full Article | PDF ArticleMore Like This
Markus Schmidt, Norbert Fürstenau, Wojtek Bock, and Waclaw Urbanczyk
Opt. Lett. 25(18) 1334-1336 (2000)
Markus Schmidt, Bernd Werther, Norbert Fürstenau, Michael Matthias, and Tobias Melz
Opt. Express 8(8) 475-480 (2001)
Ki D. Oh, Anbo Wang, and Richard O. Claus
Opt. Lett. 29(18) 2115-2117 (2004)