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Proceedings Paper

A double-fiber F-P displacement sensor based on direct phase demodulation
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Paper Abstract

To overcome the accuracy limits of fringe counting method for a F-P interferometer and the complexity of a higher resolution demodulation system such as phase generated carrier (PGC), where a residual amplitude modulation always exists in frequency modulation, this paper presents a fiber F-P displacement sensor based on double-interferometer phase demodulation, which eliminates the modulation of lightsource. Comparing to the reported double-fiber F-P structure, our design has no strict requirement for a specific phase difference between the two optical paths. Experimental results demonstrate a good linearity of 1.1% and a resolution of ±3 μm within a measuring range of 0-0.5 mm.

Paper Details

Date Published: 17 October 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84212R (17 October 2012); doi: 10.1117/12.968592
Show Author Affiliations
Min Li, Wuhan Univ. of Technology (China)
Jingjing Guo, Wuhan Univ. of Technology (China)
Bing Tong, Wuhan Univ. of Technology (China)


Published in SPIE Proceedings Vol. 8421:
OFS2012 22nd International Conference on Optical Fiber Sensors
Yanbiao Liao; Wei Jin; David D. Sampson; Ryozo Yamauchi; Youngjoo Chung; Kentaro Nakamura; Yunjiang Rao, Editor(s)

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