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).
Highlights
Optical fibres have been widely used across a multitude of sensing applications [1]
The sensor was placed in a standard water column and the response for the varying change in pressure
The Optical Fibre Pressure and Temperature Sensor (OFPTS) sensors are based on Extrinsic Fabry-Perot interferometer (EFPI) and Fibre Bragg Grating (FBG) was tested on a small remotely operated underwater vehicle (ROV) in a lab based water tank for repeatability, resolution and accuracy against electrical commercial sensors mounted on the ROV
Summary
Optical fibres have been widely used across a multitude of sensing applications [1]. Typical measurands of optical fibres include pressure and temperature [2,3,4,5,6] with significant benefits in the form of small size, immunity to electromagnetic interference, high sensitivity and low cost [7]. Many application areas have emerged, including biomedical, aerospace and marine [8,9,10,11], where pressure/temperature sensors are required at a specific location. A miniature sensor, based optical fibre technology, is described for high resolution measurement of pressure (depth) with temperature compensation for the ocean environment. The sensor, based on an optical fibre Fabry Perot interferometer (EFPI) approach, often used in a number of sensing applications such as temperature, acoustic wave sensing, pressure and liquid level sensing [15,16] will be used to measure pressure underwater. The combined pressure and temperature sensor system was tested in its desired operating environment by mounting it on-board a miniature remotely operated vehicle (ROV) and recording data whilst transitioning through varying water depths. The reflected optical spectrum of the sensor was monitored online and a pressure change caused a corresponding observable shift in the spectrum
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
