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Sensors 2013, 13(11), 14466-14483; doi:10.3390/s131114466

Plastic Optical Fibre Sensor for Spine Bending Monitoring with Power Fluctuation Compensation

1
Department of Electronic and Computer Engineering, University of Limerick, Plassey Rd., Limerick, Ireland
2
Faculty of Electrical and Electronics Engineering, Universiti Malaysia Pahang, Pekan, Pahang 26600, Malaysia
*
Author to whom correspondence should be addressed.
Received: 21 August 2013 / Revised: 14 October 2013 / Accepted: 18 October 2013 / Published: 25 October 2013
(This article belongs to the Special Issue Photonic Sensors for Industrial, Environmental and Health Monitoring)
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Abstract

This paper presents the implementation of power fluctuation compensation for an intensity-based optical fibre bending sensor aimed at monitoring human spine bending in a clinical environment. To compensate for the light intensity changes from the sensor light source, a reference signal was provided via the light reflection from an aluminum foil surface fixed at a certain distance from the source fibre end tips. From the results, it was found that the investigated sensor compensation technique was capable of achieving a 2° resolution for a bending angle working range between 0° and 20°. The study also suggested that the output voltage ratio has a 0.55% diversion due to input voltage variation between 2.9 V and 3.4 V and a 0.25% output drift for a 2 h measurement. With the achieved sensor properties, human spine monitoring in a clinical environment can potentially be implemented using this approach with power fluctuation compensation.
Keywords: plastic optical fibre sensor; spine monitoring; power fluctuation compensation; intensity modulation technique plastic optical fibre sensor; spine monitoring; power fluctuation compensation; intensity modulation technique
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Zawawi, M.A.; O'Keeffe, S.; Lewis, E. Plastic Optical Fibre Sensor for Spine Bending Monitoring with Power Fluctuation Compensation. Sensors 2013, 13, 14466-14483.

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