Distributed optical fibre sensor

摘要

There is disclosed a distributed optical fiber sensor arranged to deliver probe light pulses of different wavelengths into corresponding different sensing optical fibers, and to determine one or more parameters as functions of position along each of the sensing fibers from detected backscattered light of each corresponding wavelength. In another arrangement, the different wavelengths are directed in different corresponding directions around a loop of sensing optical fiber.

主权项

1. A distributed optical fibre sensor for determining one or more parameters as functions of position along a plurality of sensing optical fibres from properties of probe light backscattered within the sensing optical fibres, the sensor comprising:
a probe light source arranged to generate probe light pulses each at one of a plurality of optical wavelengths; a wavelength multiplexer/demultiplexer component arranged to receive the probe light pulses from the probe light source and to direct pulses of each wavelength into a different corresponding one of said sensing optical fibres, and to collect probe light backscattered within the sensing optical fibres; a detector arranged to receive the collected backscattered light and to separately detect light of each of said different wavelengths in said collected backscattered light; and an analyser arranged to determine said one or more parameters as functions of position along each of the sensing optical fibres from said detected backscattered light of each corresponding wavelength.