Methods and apparatus for distributed optical fiber sensing of s

Details Methods and apparatus for distributed optical fiber sensing of s Methods and apparatus for distributed optical fiber sensing of s

1997-01-30

1998-05-26

Font, Frank G.

Optics: measuring and testing

By particle light scattering

With photocell detection

356349, G01B 902

Patent

active

057574871

ABSTRACT:
A distributed optical fiber sensor system including a patterned array of kly reflecting broadband gratings or other sensors serially disposed along a common fiber. The laser sources are multiplexed onto the fiber and are propagated through a directional coupler toward the sensors. The return signals are directed by the directional coupler to a demultiplexer that separates the signals by center frequencies and sends each to a respective detector. All reflection signals generated by a single input pulse of a given wavelength are detected prior to the input coupling of the next input pulse of that wavelength, the input pulse repetition period being T.gtoreq.Nt.sub.0, N being the number of grating sensors and t.sub.0 being their spacing or separation in optical propagation time.

REFERENCES:
patent: 4755668 (1988-07-01), Davis
patent: 5361130 (1994-11-01), Kersey et al.

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