Optical waveguide based surface profiling apparatus

a-dSurface profiling apparatus according to one embodiment comprises three long period gratings (LPGs) fabricated in progressive three layered (PTL) fibre (18) and embedded within a deformable carrier member comprising a skeleton provided between two sheets of flexible rubber skin. The LPGs are illu...

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Bibliographic Details
Main Authors Allsop, Thomas David Paul, Earthrowl-Gould, Timothy, Bennion, Ian
Format Patent
LanguageEnglish
Published 22.05.2007
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Summary:a-dSurface profiling apparatus according to one embodiment comprises three long period gratings (LPGs) fabricated in progressive three layered (PTL) fibre (18) and embedded within a deformable carrier member comprising a skeleton provided between two sheets of flexible rubber skin. The LPGs are illuminated by three wavelength modulated, narrow bandwidth optical signals, each having a different wavelength and modulation frequency. A photodetector connected to three lock-in amplifiers measures the amplitudes of the first and second harmonic frequency components of the photodetector output signal corresponding to each LPG. Similar surface profiling apparatus forms the basis for respiratory function monitoring apparatus (100) in which five LPGs are provided within each of four PTL fibres (104, 106, 108, 110) and embedded in four carrier members (40) attached to a garment (114) to be worn by a subject.