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Sensors 2017, 17(2), 406; doi:10.3390/s17020406

An Optical Fibre Depth (Pressure) Sensor for Remote Operated Vehicles in Underwater Applications

1
Optical Fibre Sensors Research Centre, University of Limerick, Limerick V94 T9PX, Ireland
2
Mobile & Marine Robotics Research Centre, University of Limerick, Limerick V94 T9PX, Ireland
*
Authors to whom correspondence should be addressed.
Academic Editor: Caterina Ciminelli
Received: 14 November 2016 / Revised: 15 February 2017 / Accepted: 15 February 2017 / Published: 19 February 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [4400 KB, uploaded 20 February 2017]   |  

Abstract

A miniature sensor for accurate measurement of pressure (depth) with temperature compensation in the ocean environment is described. The sensor is based on an optical fibre Extrinsic Fabry-Perot interferometer (EFPI) combined with a Fibre Bragg Grating (FBG). The EFPI provides pressure measurements while the Fibre Bragg Grating (FBG) provides temperature measurements. The sensor is mechanically robust, corrosion-resistant and suitable for use in underwater applications. The combined pressure and temperature sensor system was mounted on-board a mini remotely operated underwater vehicle (ROV) in order to monitor the pressure changes at various depths. The reflected optical spectrum from the sensor was monitored online and a pressure or temperature change caused a corresponding observable shift in the received optical spectrum. The sensor exhibited excellent stability when measured over a 2 h period underwater and its performance is compared with a commercially available reference sensor also mounted on the ROV. The measurements illustrates that the EFPI/FBG sensor is more accurate for depth measurements (depth of ~0.020 m). View Full-Text
Keywords: ROV; OFPTS; Pressure; sensors; ROV control; Fabry-Perot; Fibre Bragg Gratings ROV; OFPTS; Pressure; sensors; ROV control; Fabry-Perot; Fibre Bragg Gratings
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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. (CC BY 4.0).

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MDPI and ACS Style

Duraibabu, D.B.; Poeggel, S.; Omerdic, E.; Capocci, R.; Lewis, E.; Newe, T.; Leen, G.; Toal, D.; Dooly, G. An Optical Fibre Depth (Pressure) Sensor for Remote Operated Vehicles in Underwater Applications. Sensors 2017, 17, 406.

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