Sensing system using optical fibers

Details Sensing system using optical fibers Sensing system using optical fibers

1989-12-01

1991-03-19

Healy, Brian

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

350 9630, 350 9634, 25022714, 25022719, G02B 602, H01J 516

Patent

active

050005405

ABSTRACT:
A sensing system using optical fibers having loss characteristics subject to variations of 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 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.

REFERENCES:
patent: 4778238 (1988-10-01), Hicks
patent: 4790619 (1988-12-01), Lines et al.
patent: 4834497 (1989-05-01), Angel
patent: 4893894 (1990-01-01), Caimi
patent: 4910737 (1990-03-01), Payne et al.

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