Apparatus and method for detecting and locating raman...

Details Apparatus and method for detecting and locating raman... Apparatus and method for detecting and locating raman...

G - Physics

08

C

340/136

G08C 21/00 (2006.01) G01N 21/65 (2006.01)

Patent

CA 2017557

ABSTRACT Sensing apparatus based on the use of Raman spectroscopy for detecting the presence and location of a species of interest in a medium comprises a light transmissive optical fibre with an elongate sensing length along at least a portion thereof, a light source means for transmitting pulses of light along the fibre, and a detector for detecting at the same end of the fibre as the light source Raman signals resulting from species of interest at the interface of the sensing length and a medium in which it is located. The time difference between the transmission of an excitation pulse and detection of a Raman emission signal caused by that pulse is determined, and is used to determine the position of the species along the fibre.

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