METHOD AND APPARATUS FOR DETECTING EMBEDDED REBAR WITHIN AN INTERACTION REGION OF A STRUCTURE IRRADIATED WITH LASER LIGHT

摘要

A detection system (600) is used during irradiation of an interaction regionof a structure including embedded material with laser light. The detectionsystem (600) includes a collimating lens (610) positioned to receive lightemitted from the interaction region. The detection system (600) furtherincludes 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 ofthe 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 lighttransmittance and sufficient resolution. The spectrometer (630) furtherincludes an optical grating (632) adapted to receive light from the input slit(631) and to separate the light into a spectrum of wavelengths. Thespectrometer (630) further includes a collection lens (633) adapted to receivea selected range of wavelengths of the separated light from the opticalgrating (632). The spectrometer (630) further includes a light sensor (634)adapted to receive the selected range of wavelengths and to generate a signalcorresponding to an intensity of the received light.