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8 March 2004 Novel fiber optic contrast-based sensor
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Proceedings Volume 5272, Industrial and Highway Sensors Technology; (2004)
Event: Optical Technologies for Industrial, Environmental, and Biological Sensing, 2003, Providence, RI, United States
The dislocation sensor based on the contrast phenomenon in an unbalanced fiber optic Michelson interferometer with a 3 x 3 coupler and a semiconductor multimode laser used as a source is described. Periodic contrast oscillations, which depend on a laser spectrum, occur if a measuring arm of the interferometer is elongated. So direct contrast-sensitive elongation measurement is limited only to one 200-μm long slope. In this paper we present a method of measuring range expansion up to 8 mm by linearyzation of contrast slopes. Elongation modulator in a reference arm of the interferometer is used. Experimental setup and software were worked out. For 1-m long sensor the 8-mm measuring range was obtained, where the highest difference between real and measured elongation is 25 microns
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Mieczyslaw Szustakowski and Norbert Palka "Novel fiber optic contrast-based sensor", Proc. SPIE 5272, Industrial and Highway Sensors Technology, (8 March 2004);

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