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

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

1,2,* , 1
 and 1
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
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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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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