Optical waveguide based surface profiling apparatus

Details Optical waveguide based surface profiling apparatus Optical waveguide based surface profiling apparatus

A - Human Necessities

61

B

A61B 5/103 (2006.01) A61B 5/113 (2006.01) G01N 21/47 (2006.01) G02B 6/34 (2006.01)

Patent

CA 2493152

Surface profiling apparatus (10) according to one embodiment comprises three long period gratings (LPGs) (12, 14, 16) fabricated in progressive three layered (PTL) fibre (18) and embedded within a deformable carrier member (40) comprising a skeleton (42) provided between two sheets of flexible rubber skin (44, 46). The LPGs (12, 14, 16) are illuminated by three wavelength modulated, narrow bandwidth optical signals, each having a different wavelength and modulation frequency. A photodetector (26) connected to three lock-in amplifiers (28, 30, 32) measures the amplitudes of the first and second harmonic frequency components of the photodetector output signal corresponding to each LPG (12, 14, 16). Similar surface profiling apparatus (10) 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 (40a-d) attached to a garment (114) to be worn by a subject.

L'invention concerne, selon un mode de réalisation, un appareil de profilage de surface (10) comprenant trois réseaux de période longue (LPG) (12, 14, 16) fabriqués dans une fibre à trois couches progressives (PTL) (18) intégrée dans un élément support déformable (40) constitué d'un squelette (42) formé par deux feuilles de caoutchouc souple (44, 46). Les LPG (12, 14, 16) sont éclairés par trois signaux optiques, modulés en longueur d'onde, à largeurs de bandes étroites, chacun de longueur d'onde et de fréquence de modulation différentes. Un photodétecteur (26) connecté aux trois amplificateurs synchrones (28, 30, 32) mesure les amplitudes des première et seconde composantes de fréquence harmonique du signal de sortie du photodétecteur correspondant à chaque LPG (12, 14, 16). Un appareil de profilage de surface similaire (10) forme la base d'un appareil de surveillance de fonction respiratoire (100) dans lequel cinq LPG sont mis en oeuvre dans chacune de quatre fibres PTL (104, 106, 108, 110) intégrées dans quatre éléments support (40a-d) fixés à un habit (114) porté par un sujet.

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