Method and apparatus for detecting embedded rebar within an...

B - Operations – Transporting – 23 – K

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B23K 26/03 (2006.01) G01N 21/31 (2006.01) G01N 33/38 (2006.01)

Patent

CA 2519632

A detection system (600) is used during irradiation of an interaction region of a structure including embedded material with laser light. The detection system (600) includes a collimating lens (610) positioned to receive light emitted from the interaction region. The detection system (600) further includes an optical fiber (620) optically coupled to the collimating lens (610) and a spectrometer (630) optically coupled to the optical fiber (620). The spectrometer (630) is adapted for analysis of the light for indications of the embedded material within the interaction region. The spectrometer (630) includes an input slit (631) adapted to receive light from the optical fiber (620). The input slit (631) has a width selected to provide sufficient light transmittance and sufficient resolution. The spectrometer (630) further includes an optical grating (632) adapted to receive light from the input slit (631) and to separate the light into a spectrum of wavelengths. The spectrometer (630) further includes a collection lens (633) adapted to receive a selected range of wavelengths of the separated light from the optical grating (632). The spectrometer (630) further includes a light sensor (634) adapted to receive the selected range of wavelengths and to generate a signal corresponding to an intensity of the received light.

L'invention porte sur un système de détection (600) utilisé pendant l'irradiation par un laser d'une zone d'interaction d'une structure comportant des matériaux enfouis. Ledit système comprend: un objectif collimateur (610) recevant la lumière émise par la zone d'interaction; une fibre optique (620) reliée à l'objectif (610), et un spectromètre (630) relié à la fibre optique (620). Le spectromètre (630), qui analyse la lumière pour trouver des indices de la présence de matériau enfouis dans la zone d'interaction comporte: une fente d'entrée (631) recevant la lumière de la fibre optique (620) et dont la largeur est choisie pour assurer une transmittance suffisante de la lumière et une résolution suffisante, un réseau optique (632) recevant la lumière de la fente (631) et la décomposant en un spectre de différentes longueurs d'onde, une lentille collectrice (633) recevant la plage sélectionnée de longueurs d'onde de la lumière séparée par le réseau optique (632), ainsi qu'un photodétecteur (634) recevant la plage sélectionnée de longueurs d'onde et émettant un signal correspondant à l'intensité de la lumière reçue.

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