A frequency division multiplexed low-finesse fiber optic Fabry–Perot sensor system for strain and displacement measurements

We report a novel frequency multiplexing method for addressing low finesse fiber Fabry–Perot sensors using a white light source and a CCD based monochromator. The absolute optical path length imbalance of the sensors can be determined using this method. The concept was demonstrated with three fiber Fabry–Perot interferometers for strain and displacement measurements. The accuracy is better than 0.01 μm and the maximum range is approximately 1 mm.

[1]  Emil Wolf,et al.  Principles of Optics: Contents , 1999 .

[2]  A. Kersey,et al.  Two-wavelength fibre gyroscope with wide dynamic range , 1986 .

[3]  Farhad Ansari.  Applications of fiber optic sensors in engineering mechanics : a collection of state-of-the-art papers in the application of fiber optic technologies to civil structures , 1993 .

[4]  E. J. Friebele,et al.  Ultrahigh-sensitivity strain sensing using fiber cavity etalons , 1997, Smart Structures.

[5]  Yunjiang Rao,et al.  A multiplexed optical fibre-based extrinsic Fabry-Perot sensor system for in-situ strain monitoring in composites , 1998 .

[6]  David J. Webb,et al.  Displacement sensor using channelled spectrum dispersed on a linear CCD array , 1993 .

[7]  C. Belleville,et al.  White-light interferometric multimode fiber-optic strain sensor. , 1993, Optics letters.

[8]  D. A. Jackson,et al.  Novel fiber-optic torsional vibrometers , 1992 .

[9]  L. C. Gunderson.  Fiber optic sensor applications using Fabry-Perot interferometry , 1990, Other Conferences.

[10]  Samuel Vurpillot,et al.  In-line coherence multiplexing of displacement sensors: a fiber optic extensometer , 1996, Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[11]  Yunjiang Rao,et al.  Simultaneous strain and temperature measurements in composites using a multiplexed fiber Bragg grating sensor and an extrinsic Fabry-Perot sensor , 1997, Smart Structures.

[12]  Eric Udd.  Fiber optic smart structures , 1996 .

[13]  J. Jones,et al.  Simultaneous measurement of temperature and strain: cross-sensitivity considerations , 1990 .

[14]  A. Kersey,et al.  Multiplexing of interferometric sensors using phase carrier techniques , 1987 .