Browsing by Author "James, Stephen W."

Browsing by Author "James, Stephen W."

Sort by: Order: Results:

  • Fibre-optic measurement of strain and shape on a helicopter rotor blade during a ground run: 2. Measurement of shape 
    Kissinger, Thomas; James, Stephen W.; Weber, Simone; Mullaney, Kevin; Chehura, Edmond; Pekmezci, Huseyin H.; Barrington, James; Staines, Stephen E.; Charrett, Thomas O. H.; Lawson, Nicholas J.; Lone, Mudassir; Atack, Richard; Tatam, Ralph P. (IOP Publishing, 2022-06-08)
    Optical fibre strain and shape measurement sensors were deployed on a rotor blade during a full-speed helicopter ground run, with real-time data wirelessly streamed from rotor hub-mounted sensor interrogators. In part 2 ...
  • Fibre-optic sensors with molecular coatings 
    Partridge, Matthew (Cranfield University, 2012-12)
    The intrinsic stability of fibre optic based sensing systems offer a platform that is suited to hazardous waste detection in a wide range of environments. Over the last few years Cranfield University has been working on ...
  • Frequency division multiplexing for interferometric planar Doppler velocimetry 
    Charrett, Thomas O. H.; Bledowski, Ian A.; James, Stephen W.; Tatam, Ralph P. (Optical Society of America, 2014-05-30)
    A new method of acquiring simultaneously the signal and reference channels used for interferometric planar Doppler velocimetry is proposed and demonstrated. The technique uses frequency division multiplexing (FDM) to ...
  • Frequency-division multiplexing for multicomponent shearography 
    Bledowski, Ian A.; Charrett, Thomas O. H.; Francis, Daniel; James, Stephen W.; Tatam, Ralph P. (Osa Optical Society of America, 2013-01-20)
    A new method of multiplexing the speckle patterns needed in multicomponent digital shearography systems is presented. Frequency-division multiplexing (FDM) of the measurement channels is achieved by recording speckle ...
  • Frequency-division-multiplexing technique for imaging metrology 
    Bledowski, Ian A. (Cranfield University, 2014)
    An algorithm to multiplex multiple image captures simultaneously onto a single image sensor at full frame resolution was developed for imaging metrology. Parseval’s theorem was used to obtain the image intensity from image ...
  • Full surface strain measurement using shearography 
    Groves, Roger M.; James, Stephen W.; Tatam, Ralph P. (International Society for Optical Engineering; 1999, 2001-12-31)
    Shearography is a full-field optical technique usually used for the determination of surface strain. Correlation of interferometric speckle patterns recorded before and after the object deformation yields fringes sensitive ...
  • High sensitivity pressure measurement using optical fibre sensors mounted on a composite diaphragm 
    Aime, Laura F. J.; Kissinger, Thomas; James, Stephen W.; Chehura, Edmon; Verzeletti, Alberto; Tatam, Ralph P. (Optical Society of America, 2021-01-25)
    A pressure sensor specified for aerodynamic applications and based on optical fibre strain sensors mounted on a circular glass fibre reinforced polymer membrane is presented. The use of two fibre optic strain sensing ...
  • 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 ...
  • Highly sensitive optical fibre long period grating biosensor anchored with silica core gold shell nanoparticles 
    Marques, L.; Hernandez, F. U.; James, Stephen W.; Morgan, S. P.; Clark, M.; Tatam, Ralph P.; Korposh, Sergiy (Elsevier, 2015-08-22)
    An optical fibre long period grating (LPG), modified with a coating of silica core gold shell (SiO2:Au) nanoparticles (NPs) deposited using the layer-by-layer method, was employed for the development of a biosensor. The ...
  • The influence of hydrogen loading and the fabrication process on the mechanical strength of optical fibre Bragg gratings. 
    Wei, C. Y.; Ye, Chen-Chun; James, Stephen W.; Tatam, Ralph P.; Irving, Phil E. (Elsevier Science B.V., Amsterdam., 2002-11-01)
    This paper investigates the influence of hydrogen loading and other stages of the fabrication process on the mechanical strength of fibre Bragg gratings. Following UV irradiation, tensile tests were carried out on Ge–B ...
  • Interferometric fibre optic sensors incorporating photonic crystal fibre, for the measurement of strain and load 
    Manders, Mark (Cranfield University, 2016-03)
    Strain sensing is important in numerous fields such as: structural health monitoring [1], manufacture of composites [2], and civil engineering [3]. For many of these fields fibre optic based sensors have been utilised ...
  • Interferometric fibre-optic curvature sensing for structural, directional vibration measurements 
    Kissinger, Thomas; Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (SPIE, 2017-06-26)
    Dynamic fibre-optic curvature sensing using fibre segment interferometry is demonstrated using a cost-effective rangeresolved interferometry interrogation system. Differential strain measurements from four fibre strings, ...
  • 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 ...
  • An investigation of chirped fibre Bragg gratings Fabry-Perot interferometer for sensing applications 
    Cheung, Chi Shing (Cranfield UniversityCentre for Photonics and Optical Engineering; Optical Sensors Group, 2005-03)
    Fibre interferometer configurations such as the Michelson and Fabry-Perot (FP) have been formed using uniformed and chirped Fibre Bragg Gratings (FBG) acting as partial reflectors. As well as increasing the dynamic range ...
  • 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 ...