Browsing by Author "Tatam, Ralph P."

Browsing by Author "Tatam, Ralph P."

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  • Fabrication of wavelength division multiplexed in-fibre Bragg grating arrays for structural monitoring applications 
    Dockney, Michael Lee (1997-04)
    Wavelength division multiplexed arrays of in-fibre Bragg gratings (IFBGs) are fabricated in hydrogen loaded optical fibres. The IFBG arrays are embedded into a carbon fibre composite test beam for the purpose of quantitative ...
  • Fiber optic long period grating sensors with a nanoassembled mesoporous film of SiO2 nanoparticles 
    Korposh, Sergiy; James, Stephen W.; Lee, Seung-Woo; Topliss, Stephen M.; Cheung, Sammy C.; Batty, William J.; Tatam, Ralph P. (Optical Society of America (OSA), 2010-06-07)
    A novel approach to chemical application of long period grating (LPG) optical fibers was demonstrated, which were modified with a film nanoassembled by the alternate deposition of SiO2 nanoparticles (SiO2 NPs) and ...
  • Fiber-optic chemical sensing with Langmuir-Blodgett overlay waveguides 
    Flannery, D.; James, Stephen W.; Tatam, Ralph P.; Ashwell, Geoffrey J. (Osa Optical Society of America, 1999-12-20)
    Fiber-optic chemical sensing has been demonstrated with a side-polished single- mode optical fiber, evanescently coupled to chemically sensitive Langmuir- Blodgett (LB) overlay waveguides. The sensors exhibit a ...
  • 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 grating refractometer sensors for composite process monitoring 
    Buggy, Stephen J.; Chehura, Edmon; Skordos, Alexandros A.; Dimopoulos, A.; James, Stephen W.; Partridge, Ivana K.; Tatam, Ralph P. (2007-06-17)
    Optimum performance from advanced composites requires careful control of the resin matrix during cure. This is to ensure there are no cure induced voids and to minimise the build up of internal stresses. Careful control ...
  • Fibre imaging bundles for full-field optical coherence tomography 
    Ford, Helen D.; Tatam, Ralph P. (Iop Publishing Ltd, 2007-01-01)
    An imaging fibre bundle is incorporated into a full-field imaging OCT system, with the aim of eliminating the mechanical scanning currently required at the probe tip in endoscopic systems. Each fibre within the imaging ...
  • A fibre optic angle sensing tape for applications in robotics and automation 
    Pillai, Sivaji; Charrett, Thomas O. H.; Kissinger, Thomas; James, Stephen W.; Tatam, Ralph P. (SPIE, 2023-08-15)
    A dual-fibre single-plane angle-sensing tape that utilizes optical Fibre Segment Interferometry and Range- Resolved Interferometry (RRI) for angle sensing is presented. The sensing tape facilitates the multiplexing of an ...
  • Fibre optic fizeau intererometer for optical coherence tomography 
    Casaubieilh, P. (Cranfield University, 2006)
    The aim of the project was to develop the Fizeau interferometer configuration to take advantage of the benefits derived from its “downlead insensitivity” to temperature and polarisation fading. This sensing interferometer ...
  • Fibre optic hydrogen sensing for long term use in explosive environments 
    Chowdhury, S. A. (Cranfield University, 2015-09)
    Hydrogen is an explosive and flammable gas with a lower explosive limit of just 4% volume in air. It is important to monitor the concentration of hydrogen in a potentially hazardous environment where hydrogen may be ...
  • Fibre optic sensors with biologically active coatings for the detection of cells. 
    Rendon Romero, Antonio (Cranfield UniversitySATM, 2019-05)
    The purpose of this thesis is to develop a rapid, sensitive and selective optical sensor for Campylobacter jejuni detection as it is the most common cause of foodborne illness in humans. The optical sensor platform was ...
  • Fibre Optic Sensors with Nano-Structured Coatings. 
    James, Stephen W.; Tatam, Ralph P. (Institute of Physics, 2006-07-01)
    A review of optical fibre devices employing nano-structured coatings is presented. Active and passive coatings, deposited using the Langmuirâ  Blodgett and electro-static self-assembly techniques, have been utilised ...
  • 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 ...
  • Fibre segment interferometry using code-division multiplexed optical signal processing for strain sensing applications 
    Kissinger, Thomas; Charrett, Thomas O. H.; Tatam, Ralph P. (Iop Publishing Ltd, 2013-09-30)
    A novel optical signal processing scheme for multiplexing fibre segment interferometers is proposed. The continuous-wave, homodyne technique combines code-division multiplexing with single-sideband modulation. It uses only ...
  • Fibre-coupled, multiplexed methane detection using range-resolved interferometry 
    Bremner, James; Kissinger, Thomas; Hodgkinson, Jane; Tatam, Ralph P. (Institute of Physics, 2021-02-08)
    We describe the first use of range-resolved interferometric signal processing for measurement of spectral transmission. This was applied to gas sensing using tunable diode laser spectroscopy, allowing the simultaneous and ...
  • Fibre-optic long period gratings for sensing applications 
    Khaliq, Sarfraz (Cranfield University, 2003-03)
    Long period gratings (LPGs) are formed by inducing a permanent periodic modulation of the refractive index (RI) of the core of an optical fibre. The transmission spectrum of the LPG contains a series of attenuation bands ...
  • 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 ...
  • Finding minimum spanning trees more efficiently for tile-based phase unwrapping. 
    Al-Sawaf, Firas; Tatam, Ralph P. (Iop Publishing Ltd, 2006-06-06)
    The tile-based phase unwrapping method employs an algorithm for finding the minimum spanning tree (MST) in each tile. We first examine the properties of a tile's representation from a graph theory viewpoint, observing that ...
  • Formaldehyde sensor using non-dispersive UV spectroscopy at 340nm 
    Davenport, John; Hodgkinson, Jane; Saffell, John R.; Tatam, Ralph P. (International Society for Optical Engineering; 1999, 2014-05-22)
    Formaldehyde is a volatile organic compound that exists as a gas at room temperature. It is hazardous to human health causing irritation of the eyes, nose and throat, headaches, limited pulmonary function and is a potential ...