Browsing by Author "James, Stephen W."

Browsing by Author "James, Stephen W."

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  • 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 ...
  • A long period grating based directional flow sensor 
    Buggy, Stephen J.; James, Stephen W.; Tatam, Ralph P. (International Society for Optical Engineering; 1999, 2008-12-31)
    A chirped long period grating (LPG) is used as a directional flow sensor by monitoring the change in the transmission spectrum upon immersion in an oil of refractive index higher than that of the fibre cladding. The ...
  • Long Period Grating Based Fibre Optic Chemical Sensors 
    Korposh, Sergiy; Lee, Seung-Woo; James, Stephen W. (Springer, 2016-11-03)
    The principle of operation of optical fibre long period grating (LPG) sensors is described. In particular, the chapter explores the use of LPGs as a chemical sensing platform, discussing the fabrication of LPGs and the ...
  • Long period grating based toluene sensor for use with water contamination 
    Partridge, Matthew; Wong, Rebecca; James, Stephen W.; Davis, Frank; Higson, Seamus P. J.; Tatam, Ralph P. (Elsevier Science B.V., Amsterdam., 2014-11-01)
    A demonstration of the use of a calix[4]resorcinarene coated optical fibre long period grating sensor for the detection of toluene in water is presented. Monitoring water quality both for domestic use and around industrial ...
  • A long period grating optical fiber sensor with nano-assembled porphyrin layers for detecting ammonia gas 
    Wang, Tao; Yasukochi, Wataru; Korposh, Sergiy; James, Stephen W.; Tatam, Ralph P.; Lee, Seung-Woo (Elsevier, 2016-01-19)
    In this study, the ability of a long period grating (LPG) optical fiber sensor coated with a multilayer film of poly(diallyldimethyammonium chloride) (PDDA) and tetrakis(4-sulfophenyl)porphine (TSPP) to detect ammonia gas ...
  • A long period grating-based chemical sensor insensitive to the influence of interfering parameters 
    James, Stephen W.; Korposh, Sergiy; Lee, Seung-Woo; Tatam, Ralph P. (Optical Society of America (OSA), 2014-04-07)
    An optical fibre chemical sensor that is insensitive to interfering parameters including temperature and surrounding refractive index is described. The sensor is based upon a Mach-Zehnder interferometer formed by a pair ...
  • Metal-organic framework thin films on a surface of optical fibre long period grating for chemical sensing 
    Hromadka, J.; Tokay, B.; James, Stephen W.; Korposh, Sergiy (SPIE, 2017-04-23)
    An optical fibre long period grating (LPG) modified with a thin film of HKUST-1, a material from metal organic framework (MOF) family, was employed for the detection of carbon dioxide. The sensing mechanism is based on the ...
  • Modification of the refractive index response of long period gratings using thin film overlays. 
    Ishaq Imran, M; Quintela, Antonio; James, Stephen W.; Ashwell, Geoffrey J.; Tatam, Ralph P. (Elsevier Science B.V., Amsterdam., 2005-06-01)
    The response of a fibre optic long period grating (LPG) to the surrounding refractive index is shown to be modified by the deposition of a thin film of thickness of order 100 nm onto the cladding. The LPG becomes sensitive ...
  • Modifying monolayer behaviour by incorporating subphase additives and improving Langmuir–Blodgett thin film deposition on optical fibres 
    Partridge, Matthew; Wong, Rebecca; Collins, Mike; James, Stephen W.; Davis, Frank; Tatam, Ralph P.; Higson, Seamus P. J. (Elsevier, 2014-01-17)
    Experiments showing the possibility of modifying the behaviour of calix[4]resorcinarene monolayers at the air–water interface and optimising the deposition of multilayer coatings onto optical fibres are presented. The ...
  • Monitoring techniques for the manufacture of tapered optical fibers 
    Mullaney, Kevin; Goncalves Correia, Ricardo; Staines, Stephen E.; James, Stephen W.; Tatam, Ralph P. (OSA Publishing, 2015-10-01)
    The use of a range of optical techniques to monitor the process of fabricating optical fiber tapers is investigated. Thermal imaging was used to optimize the alignment of the optical system; the transmission spectrum of ...
  • Monitoring the fabrication of tapered optical fibres 
    Mullaney, Kevin; Correia, Ricardo; Staines, Stephen; James, Stephen W.; Tatam, Ralph P. (SPIE, 2017-04-23)
    A variety of optical methods to enhance the process of making optical fibre tapers are explored. A thermal camera was used to both refine the alignment of the optical components and optimize the laser power profile during ...
  • Multi-component shearography using optical fibre imaging-bundles 
    Groves, Roger M.; James, Stephen W.; Tatam, Ralph P. (International Society for Optical Engineering; 1999, 2003-12-31)
    Shearography is a full-field non-contact optical technique usually used for the investigation of defects in nondestructive testing. In shearography interferometric speckle patterns recorded before and after object ...
  • Multi-component strain development in superconducting magnet coils monitored using fibre Bragg grating sensors fabricated in highly linearly birefringent fibre 
    Chehura, Edmon; Buggy, Stephen J.; James, Stephen W.; Johnstone, Adam; Lakrimi, M’hamed; Domptail, Fred; Twin, Andrew; Tatam, Ralph P. (Institute of Physics, 2011-12-31)
    The commissioning of superconducting magnet coils was monitored using embedded optical fibre Bragg grating sensors (FBG) fabricated in highly linearly birefringent (HiBi) fibre. The HiBi FBG sensors monitored the internal ...
  • Multi-parameter measurements using optical fibre long period gratings for indoor air quality monitoring 
    Hromadka, J.; Korposh, Sergiy; Partridge, Matthew; James, Stephen W.; Crump, Derrick; Davis, Frank; Tatam, Ralph P. (Elsevier, 2016-12-11)
    An array of three long period gratings (LPGs) fabricated in a single optical fibre and multiplexed in the wavelength domain was used to measure simultaneously temperature, relative humidity (RH) and volatile organic compounds ...
  • Multiplexing a serial array of tapered optical fibre sensors using coherent optical frequency domain reflectometry 
    Jarzebinska, Renata; Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (Iop Publishing Ltd, 2012-08-01)
    The use of high spatial resolution optical frequency domain reflectometry (OFDR) to facilitate the multiplexing of a serial array of tapered optical fibre sensors is presented. Changes in the attenuation of the Rayleigh ...
  • Multiplexing curvature sensors using fibre segment interferometry for lateral vibration measurements 
    Kissinger, Thomas; Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (SPIE - International Society for Optics and Photonics, 2017-04-23)
    Dynamic fibre-optic curvature sensing is demonstrated by interrogating chains of fibre segments, separated by broadband Bragg grating reflectors, using range-resolved interferometry (RRI). Four fibre strings, containing ...
  • Multiplexing of Fibre optic long period Grating based interferometric sensors 
    Murphy, Richard P.; James, Stephen W.; Tatam, Ralph P. (IEEE Institute of Electrical and Electronics, 2007-03-01)
    Two long-period gratings (LPGs) fabricated in series in an optical fiber form a Mach-Zehnder interferometer, producing a sinusoidal channelled spectrum within the characteristic LPG attenuation bands, which has the ...
  • Nested long period grating interferometers 
    Murphy, Richard P.; James, Stephen W.; Tatam, Ralph P. (International Society for Optical Engineering; 1999, 2007-12-31)
    The concept of nested fibre optic long period grating (LPG) based interferometers is introduced. A number of in-series, identical LPGs may be used to form a set of nested, multiplexed Mach-Zehnder interferometers that ...
  • Novel highly sensitive protein sensors based on tapered optical fibres modified with Au-based nanocoatings 
    Urrutia, Aitor; Bojan, Kartheka; Marques, L.; Mullaney, Kevin; Goicoechea, Javier; James, Stephen W.; Clark, M.; Tatam, Ralph P.; Korposh, Sergiy (Hindawi Publishing Corporation, 2016-08-08)
    In this work, novel protein sensors based on tapered optical fibres modified with Au coatings deposited using two different procedures are proposed. Au based coatings are deposited onto a non-adiabatic tapered optical fibre ...
  • On-line monitoring of multi-component strain development in a tufting needle using optical fibre Bragg grating sensors 
    Chehura, Edmon; Dell'Anno, Giuseppe; Huet, Tristan; Staines, Stephen E.; James, Stephen W.; Partridge, Ivana K.; Tatam, Ralph P. (Institute of Physics, 2014-05-20)
    Dynamic loadings induced on a tufting needle during the tufting of dry carbon fibre preform via a commercial robot-controlled tufting head were investigated in situ and in real-time using optical fibre Bragg grating (FBG) ...