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Proceedings Paper

Remote vibration sensor using fiber optic fused 2x2 coupler
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Paper Abstract

A simple geometrical fiber optic vibration sensor is designed and demonstrated using fiber optic fused 2x2 coupler that utilizes the principle of reflection intensity modulation. The rational output is used to avoid the effects of source signal power fluctuations and fiber bending losses. The calibrated 1mm linear region of the displacement characteristic curve of the sensor having high sensitivity of 2.1 mV/mm (0.36 a.u. /mm) is considered for vibration measurement. The experimental results show that the sensor is capable to measure the frequency up to 3500 Hz with ~0.03μm resolution of vibration amplitude over a dynamic range of 0-1mm. The SNR of the rational output is also improved with respect to the sensing signal. In comparison with dual-fiber and bifurcated-bundle fiber, this sensor eliminates the dark region and front slope which facilitates the easy alignment. The simplicity of design, non-contact measurement, high degree of sensitivity, economical along with advantages of fiber optic sensors are attractive attributes of the designed sensor that lend to real time monitoring and embedded applications.

Paper Details

Date Published: 18 September 2013
PDF: 9 pages
Proc. SPIE 8836, Optomechanical Engineering 2013, 883605 (18 September 2013); doi: 10.1117/12.2023462
Show Author Affiliations
Dinakar Dantala, National Institute of Technology, Warangal (India)
Kishore Putha, National Institute of Technology, Warangal (India)
Srimannarayana Kamineni, National Institute of Technology, Warangal (India)
Vengal Rao Pachava, National Institute of Technology, Warangal (India)

Published in SPIE Proceedings Vol. 8836:
Optomechanical Engineering 2013
Alson E. Hatheway, Editor(s)

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