Optical fiber sensors based on pressure-induced temporal...

Details Optical fiber sensors based on pressure-induced temporal... Optical fiber sensors based on pressure-induced temporal...

2006-11-21

2006-11-21

Epps, Georgia (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S227180, C385S028000, C385S037000

Reexamination Certificate

active

07138621

ABSTRACT:
A optical fiber sensor for measuring temperature and/or pressure employs temporally created long period gratings. The gratings may be produced by a periodic change in the refractive index of the fiber along the fiber longitudinal axis caused by periodically spaced compressive and/or expansive forces or by spaced-apart unbalanced forces that cause periodic fiber micro-bending. Pressure and temperature are determined by measuring changes in both the wavelength at which light is coupled from a mode guided by a core to a different mode and an amount of such coupling. The gratings are created intrinsically and extrinsically. Single and multiple core fibers are used.

REFERENCES:
patent: 5641956 (1997-06-01), Vengsarkar et al.
patent: 5757540 (1998-05-01), Judkins et al.
patent: 6282341 (2001-08-01), Digonnet et al.

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