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Optical Engineering

Vibration sensor using 2 × 2 fiber optic coupler
Author(s): Putha Kishore; Dantala Dinakar; Kamineni Srimannarayana; Pachava V. Rao
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Paper Abstract

A simple fiber optic vibration sensor is designed and demonstrated using fiber optic fused 2×2 coupler that utilized the principle of reflected light intensity modulation. In order to avoid source signal power fluctuations and fiber bending losses, the rational output (RO) technique is adopted. A calibrated 1-mm linear and high sensitivity of 0.36  a.u./mm (2.1  mV/μm ) region of the displacement characteristic curve is considered for vibration measurement. The experimental results show that the sensor is capable of measuring the frequency up to 3500 Hz with ∼0.03−μm resolution of vibration amplitude over a dynamic range of 0 to 1 mm. The signal-to-noise ratio of the RO is also improved with respect to the sensing signal. In comparison with dual-fiber and bifurcated-bundle fiber, the designed sensor consists only of a single slope that makes the sensor alignment simple by eliminating the dark region and front slope. Simplicity in design, noncontact measurement, high degree of sensitivity, and economical, along with advantages of fiber optic sensors, are the attractive attributes of the designed sensor that lend support to real-time monitoring and embedded applications.

Paper Details

Date Published: 4 October 2013
PDF: 8 pages
Opt. Eng. 52(10) 107104 doi: 10.1117/1.OE.52.10.107104
Published in: Optical Engineering Volume 52, Issue 10
Show Author Affiliations
Putha Kishore, National Institute of Technology, Warangal (India)
Dantala Dinakar, National Institute of Technology, Warangal (India)
Kamineni Srimannarayana, National Institute of Technology, Warangal (India)
Pachava V. Rao, National Institute of Technology, Warangal (India)

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