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

Min Li; Jingjing Guo; Bing Tong

doi:10.1117/12.968592

17 October 2012 A double-fiber F-P displacement sensor based on direct phase demodulation

Min Li, Jingjing Guo, Bing Tong

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84212R (2012) https://doi.org/10.1117/12.968592
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

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.

Citation Download Citation

Min Li, Jingjing Guo, and Bing Tong "A double-fiber F-P displacement sensor based on direct phase demodulation", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84212R (17 October 2012); https://doi.org/10.1117/12.968592

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