Abstract

We report on the design, construction and test of a generic form of sensor for making distributed measurements of a range of chemical parameters. The technique combines optical time-domain reflectometry with chemically sensitive water-swellable polymers (hydrogels). Initial experiments have concentrated on demonstrating a distributed water detector; however, gels have been developed that enable this sensor to be readily adapted to distributed pH measurements.

© 1995 Optical Society of America

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References

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  1. Product Data, Optoelectronics, Inc., Unit 9, 2538 Speers Road, Oakville, Ontario, Canada.
  2. N. A. Peppas, Polymers, Vol. II of Hydrogels in Medicine and Pharmacy (CRC, Boca Raton, Fla., 1987).
  3. R. Griffiths, G. W. Nelson, Proc. Soc. Photo-Opt. Instrum. Eng. 985, 12 (1988).
  4. J. N. Fields, Appl. Phys. Lett. 36, 799 (1979).
    [CrossRef]
  5. W. C. Michie, B. Culshaw, N. B. Graham, C. Moran, P. T. Gardiner, UK patent application PCT/GB94/00202.
  6. C. Moran, N. B. Graham, “Random block copolymers,” UK patent application 9306887.2.

1988 (1)

R. Griffiths, G. W. Nelson, Proc. Soc. Photo-Opt. Instrum. Eng. 985, 12 (1988).

1979 (1)

J. N. Fields, Appl. Phys. Lett. 36, 799 (1979).
[CrossRef]

Culshaw, B.

W. C. Michie, B. Culshaw, N. B. Graham, C. Moran, P. T. Gardiner, UK patent application PCT/GB94/00202.

Fields, J. N.

J. N. Fields, Appl. Phys. Lett. 36, 799 (1979).
[CrossRef]

Gardiner, P. T.

W. C. Michie, B. Culshaw, N. B. Graham, C. Moran, P. T. Gardiner, UK patent application PCT/GB94/00202.

Graham, N. B.

W. C. Michie, B. Culshaw, N. B. Graham, C. Moran, P. T. Gardiner, UK patent application PCT/GB94/00202.

C. Moran, N. B. Graham, “Random block copolymers,” UK patent application 9306887.2.

Griffiths, R.

R. Griffiths, G. W. Nelson, Proc. Soc. Photo-Opt. Instrum. Eng. 985, 12 (1988).

Michie, W. C.

W. C. Michie, B. Culshaw, N. B. Graham, C. Moran, P. T. Gardiner, UK patent application PCT/GB94/00202.

Moran, C.

W. C. Michie, B. Culshaw, N. B. Graham, C. Moran, P. T. Gardiner, UK patent application PCT/GB94/00202.

C. Moran, N. B. Graham, “Random block copolymers,” UK patent application 9306887.2.

Nelson, G. W.

R. Griffiths, G. W. Nelson, Proc. Soc. Photo-Opt. Instrum. Eng. 985, 12 (1988).

Peppas, N. A.

N. A. Peppas, Polymers, Vol. II of Hydrogels in Medicine and Pharmacy (CRC, Boca Raton, Fla., 1987).

Appl. Phys. Lett. (1)

J. N. Fields, Appl. Phys. Lett. 36, 799 (1979).
[CrossRef]

Proc. Soc. Photo-Opt. Instrum. Eng. (1)

R. Griffiths, G. W. Nelson, Proc. Soc. Photo-Opt. Instrum. Eng. 985, 12 (1988).

Other (4)

W. C. Michie, B. Culshaw, N. B. Graham, C. Moran, P. T. Gardiner, UK patent application PCT/GB94/00202.

C. Moran, N. B. Graham, “Random block copolymers,” UK patent application 9306887.2.

Product Data, Optoelectronics, Inc., Unit 9, 2538 Speers Road, Oakville, Ontario, Canada.

N. A. Peppas, Polymers, Vol. II of Hydrogels in Medicine and Pharmacy (CRC, Boca Raton, Fla., 1987).

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Figures (4)

Fig. 1
Fig. 1

Schematic of a hydrogel/fiber-optic water detector.

Fig. 2
Fig. 2

Attenuation response of the hydrogel sensor in water.

Fig. 3
Fig. 3

OTDR trace of a hydrogel sensor wet in two locations [vertical axis, loss (arbitrary units)].

Fig. 4
Fig. 4

Swelling response of pH-sensitive hydrogel.

Equations (1)

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Δ m = 2 π a / ( 2 δ ) ,

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