Optical fiber pH sensor

Details Optical fiber pH sensor Optical fiber pH sensor

2007-07-31

2007-07-31

Pak, Sung (Department: 2874)

Optical waveguides

Optical waveguide sensor

Including physical deformation or movement of waveguide

Reexamination Certificate

active

11137432

ABSTRACT:
An optical fiber pH sensor100, 200, 300is described, where a transducer mechanically couples a Bragg grating to a pH-sensitive hydrogel, said sensor comprising a central part110, 210, 301where are placed the optical fiber121containing a Bragg grating122, the pH-sensitive hydrogel set of discs130, and the mechanical transducer which is a spring123a beam215or still the optical fiber itself121, the mechanical transducer assuring the strain on the Bragg grating122. The change in hydrogel hydrodynamic volume resulting from a change of the pH of the medium introduces a force that is sufficient to cause a strain in the Bragg grating. The measure of the pH change is retrieved using the usual techniques for wavelength measurement. The pH sensor100, 200, 300of the invention is useful for the indirect evaluation and control of corrosion in petroleum wells and is suitable for multiplexing with other optical fiber sensors measuring the same or different parameters.

REFERENCES:
patent: 5015843 (1991-05-01), Seitz et al.
patent: 6965708 (2005-11-01), Luo et al.
patent: 7003184 (2006-02-01), Ronnekleiv et al.
patent: 2002/0041724 (2002-04-01), Ronnekleiv et al.
patent: 2004/0022475 (2004-02-01), Pennington

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