A fiber-optic polarimetric strain sensor of l<sub>S</sub>=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
(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)