Browsing by Author "Correia, Ricardo N."

Browsing by Author "Correia, Ricardo N."

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  • Development and application of optical fibre strain and pressure sensors for in-flight measurements 
    Lawson, Nicholas J.; Correia, Ricardo N.; James, Stephen W.; Partridge, Matthew; Staines, Stephen E.; Gautrey, James E.; Garry, Kevin; Holt, Jennifer C.; Tatam, Ralph P. (IOP Publishing, 2016-09-16)
    Fibre optic based sensors are becoming increasingly viable as replacements for traditional flight test sensors. Here we present laboratory, wind tunnel and flight test results of fibre Bragg gratings (FBG) used to measure ...
  • Evaluation of the optical switching characteristics of erbium-doped fibres for the development of a fibre Bragg grating sensor interrogator 
    Rigas, E.; Correia, Ricardo N.; Stathopoulos, N. A.; Savaidis, S. P.; James, Stephen W.; Bhattacharyya, Debabrata; Kirby, Paul B.; Tatam, Ralph P. (SPIE, 2014-06-02)
    A polling topology that employs optical switching based on the properties of erbium-doped fibres (EDFs) is used to interrogate an array of FBGs. The properties of the EDF are investigated in its pumped and un-pumped states ...
  • Fibre Bragg grating based effective soil pressure sensor for geotechnical applications 
    Correia, Ricardo N.; Li, Jin; Staines, Stephen E.; Chehura, Edmon; James, Stephen W.; Tatam, Ralph P.; Kutner, Joel; Dewhurst, Paul; Ferreira, Pedro (International Society for Optical Engineering; 1999, 2009-12-31)
    An effective-soil-pressure sensor for geotechnical applications based on Fibre Bragg Gratings is presented. The sensor simultaneous measures total soil pressure and pore pressure, allowing the calculation of the effective ...
  • A fibre Bragg grating based inclinometer system for ground movement measurement 
    Li, Jin; Correia, Ricardo N.; Chehura, Edmon; Staines, Stephen E.; James, Stephen W.; Tatam, Ralph P. (International Society for Optical Engineering; 1999, 2010-12-31)
    The measurement of ground movement is an essential part of many geotechnical engineering operations. For decades, inclinometer systems have traditionally been used for this purpose to provide crucial information to ...
  • Fibre segment interferometry for dynamic strain measurements 
    Kissinger, Thomas; Correia, Ricardo N.; Charrett, Thomas O. H.; James, Stephen W.; Tatam, Ralph P. (Institute of Electrical and Electronics Engineers, 2016-02-18)
    Using a novel range-resolved interferometric signal processing technique based on the sinusoidal optical frequency modulation of a cost-effective laser diode, a fibre sensing approach termed fibre segment interferometry ...
  • Highly sensitive contact pressure measurements using FBG patch in endotracheal tube cuff 
    Correia, Ricardo N.; Blackman, O. R.; Hernandez, F. U.; Korposh, Sergiy; Morgan, S. P.; Hayes-Gill, R.; James, Stephen W.; Evans, D.; Norris, A. (SPIE, 2016-05-31)
    A method for measuring the contact pressure between an endotracheal tube cuff and the trachea was designed and developed by using a fibre Bragg grating (FBG) based optical fibre sensor. The FBG sensor is encased in an epoxy ...
  • Interrogation of fibre Bragg gratings through a fibre optic rotary joint on a geotechnical centrifuge 
    Correia, Ricardo N.; James, Stephen W.; Marshall, Alec; Heron, Charles; Korposh, Sergiy (SPIE, 2016-05-31)
    The monitoring of an array of fibre Bragg gratings (FBGs) strain sensors was performed through a single channel, single mode fibre optic rotary joint (FORJ) mounted on a geotechnical centrifuge. The array of three FBGs was ...
  • Locally pressed fibre Bragg grating pressure sensor 
    Correia, Ricardo N.; Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (2006-12-31)
    A spectral-hole created by locally pressing a fibre Bragg grating exhibited a wavelength-shift within the FBG bandwidth. A sensitivity of 74.3pm/(N/mm) was obtained for pressure applied along the slow axis of a high ...
  • An optical fiber hydrogen sensor using a palladium-coated ball lens 
    Chowdhury, Sahar A.; Correia, Ricardo N.; Francis, Daniel; Brooks, Simon J.; Jones, Benjamin J. S.; Thompson, Alexander W. J.; Hodgkinson, Jane; Tatam, Ralph P. (Institute of Electrical and Electronics Engineers, 2015-06-15)
    A self-referenced optical fiber refractometer using a ball lens as a sensor head has been developed and characterized. A 350-μm ball lens created at the tip of a single mode fiber has been coated with a 40-nm optically ...
  • Range-resolved signal processing for fibre segment interferometry applied to dynamic long-gauge length strain sensing 
    Kissinger, Thomas; Correia, Ricardo N.; Charrett, Thomas O. H.; James, Stephen W.; Tatam, Ralph P. (SPIE, 2015-11)
    A range-resolved interferometric signal processing technique using sinusoidal optical frequency modulation is applied to fibre segment interferometry. Here, six optical fibre segments of gauge length 12.5 cm are used as ...
  • A transverse loading technique to enhance the pressure measurement capability of fibre Bragg gratings 
    Correia, Ricardo N.; Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (International Society for Optical Engineering; 1999, 2008-12-31)
    A fibre optic pressure sensor based on the application of a transverse load onto an epoxy-resin material embedded over a sub-section of a fibre Bragg grating (FBG) is presented. When a transverse load is applied to the ...