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Proceedings Paper

Low-coherence interferometric method for vibration measurement using 3x3 fiber optic coupler
Author(s): Milos C. Tomic; Zoran V. Djinovic
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Paper Abstract

An interferometric method for non-contact measurement of very small amplitude vibration in confined space, in situation of relatively large and slow vibrating object movement, is presented. The method is based on a fully passive stabilization scheme, with 3 X 3 fused fiber- optic directional coupler. The simple measuring probe head is consisted of two single mode optical fibers of nearly same length, directed towards the vibrating part of target and a stationary part of target. Low coherence source is used to prevent unwanted interferences with beams reflected from fiber ends. If the whole target is slowly moving towards the probe head, the condition for interference is not disturbed and a stable vibrating signal is obtained. The method is experimentally verified with a calibrated piezoelectric transducer as a target, driven an acoustical frequencies. The minimum detectable amplitude of 10 pm/(root)Hz is obtained.

Paper Details

Date Published: 31 August 2000
PDF: 8 pages
Proc. SPIE 4074, Applications of Optical Fiber Sensors, (31 August 2000); doi: 10.1117/12.397912
Show Author Affiliations
Milos C. Tomic, Institute for Microelectronic Technology and Single Crystals (FR Yugoslavia)
Zoran V. Djinovic, Institute for Microelectronic Technology and Single Crystals (Serbia)

Published in SPIE Proceedings Vol. 4074:
Applications of Optical Fiber Sensors
Alan J. Rogers, Editor(s)

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