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Proceedings Paper

A common path fibre optic based interferometric displacement sensor with enhanced range
Author(s): D. A. Jackson; R. Cernat; A. Podoleanu
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Paper Abstract

The transfer functions of single and dual interferometric cavities were measured with 1300nm high power, tuneable fibre laser with a coherence length of 20mm. The interferrogram of the dual cavity is complex. The positions of the surfaces in the cavities were determined using Fast Fourier transforms. A feature of the dual cavity is an increase in the 'effective' coherence length of the source, illuminating a simple common path interferometer. A 4*1 optical switch was incorporated with the laser allowing near simultaneous data to be recorded from up to 4 probes. A potential application for a dual cavity probe is discussed.

Paper Details

Date Published: 7 November 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 8421AN (7 November 2012); doi: 10.1117/12.968587
Show Author Affiliations
D. A. Jackson, Univ. of Kent (United Kingdom)
R. Cernat, Univ. of Kent (United Kingdom)
A. Podoleanu, Univ. of Kent (United Kingdom)


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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