Low-coherence interferometric method for vibration measurement using 3x3 fiber optic coupler

Milos C. Tomic; Zoran V. Djinovic

doi:10.1117/12.397912

31 August 2000 Low-coherence interferometric method for vibration measurement using 3x3 fiber optic coupler

Milos C. Tomic, Zoran V. Djinovic

Proceedings Volume 4074, Applications of Optical Fiber Sensors; (2000) https://doi.org/10.1117/12.397912
Event: Symposium on Applied Photonics, 2000, Glasgow, United Kingdom

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.

Citation Download Citation

Milos C. Tomic and Zoran V. Djinovic "Low-coherence interferometric method for vibration measurement using 3x3 fiber optic coupler", Proc. SPIE 4074, Applications of Optical Fiber Sensors, (31 August 2000); https://doi.org/10.1117/12.397912

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