FUEHLEREINRICHTUNG MIT OPTISCHEN FASERN.

摘要

There is provoded a sensing system using optical fibers having loss characteristics subject to variations for a signal light wave as a pumping light wave with a wavelength different from that of a pumping light wave is coupled into said optical fiber. Unlike conventional OTDRs that utilizes a light back scattering in an optical fiber, a sensing system using optical fibers according to the invention utilizes the light passing through an optical fiber as a detected signal in order to enhance the efficiency and effectiveness of the system and therefore it has a significantly improved S/N ratio and a dynamic range of measurement as compared with those of conventional OTDRs. Moreover, continuous light may be used for the signal light wave (detected signal) to increase the rate of light emission for detection and to reduce the time required for measurement providing remarkable advantages of the system when used for industrial applications.