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An optical fibre depth (pressure) sensor for remote operated vehicles in underwater applications
Date
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 similar to 0.020 m).
Supervisor
Description
peer-reviewed
Publisher
MDPI
Citation
Sensors;17, 406
Files
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Toal_2017_optical.pdf
Adobe PDF, 4.29 MB
Keywords
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Funding code
Funding Information
Irish Research Council (IRC), Science Foundation Ireland (SFI), Marine Institute Ireland