Abstract

We present a novel distributed sensor that utilizes the temperature and strain dependence of the frequency at which the Brillouin loss is maximized in the interaction between a cw laser and a pulsed laser. With a 22-km sensing length, a strain resolution of 20 μ and a temperature resolution of 2 °C have been achieved with a spatial resolution of 5 m.

© 1994 Optical Society of America

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References

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  1. J. P. Dakin, D. J. Partt, G. W. Bibby, J. N. Ross, Electron. Lett. 21, 569 (1985).
    [CrossRef]
  2. T. Kurashima, T. Horiguchi, M. Tateda, Opt. Lett. 15, 1038 (1990).
    [CrossRef] [PubMed]
  3. X. Bao, D. J. Webb, D. A. Jackson, Opt. Lett. 18, 552 (1993).
    [CrossRef] [PubMed]
  4. X. Bao, D. J. Webb, D. A. Jackson, in Proceedings of the Ninth International Conference on Optical Fiber Sensors (Associazione Elettrotecnica ed Elettronica Italiana, Firenze, Italy, 1993), postdeadline paper 3.
  5. T. Kurashima, T. Horiguchi, M. Tateda, IEEE Photon. Technol. Lett. 2, 352 (1990).
    [CrossRef]

1993 (1)

1990 (2)

T. Kurashima, T. Horiguchi, M. Tateda, IEEE Photon. Technol. Lett. 2, 352 (1990).
[CrossRef]

T. Kurashima, T. Horiguchi, M. Tateda, Opt. Lett. 15, 1038 (1990).
[CrossRef] [PubMed]

1985 (1)

J. P. Dakin, D. J. Partt, G. W. Bibby, J. N. Ross, Electron. Lett. 21, 569 (1985).
[CrossRef]

Bao, X.

X. Bao, D. J. Webb, D. A. Jackson, Opt. Lett. 18, 552 (1993).
[CrossRef] [PubMed]

X. Bao, D. J. Webb, D. A. Jackson, in Proceedings of the Ninth International Conference on Optical Fiber Sensors (Associazione Elettrotecnica ed Elettronica Italiana, Firenze, Italy, 1993), postdeadline paper 3.

Bibby, G. W.

J. P. Dakin, D. J. Partt, G. W. Bibby, J. N. Ross, Electron. Lett. 21, 569 (1985).
[CrossRef]

Dakin, J. P.

J. P. Dakin, D. J. Partt, G. W. Bibby, J. N. Ross, Electron. Lett. 21, 569 (1985).
[CrossRef]

Horiguchi, T.

T. Kurashima, T. Horiguchi, M. Tateda, Opt. Lett. 15, 1038 (1990).
[CrossRef] [PubMed]

T. Kurashima, T. Horiguchi, M. Tateda, IEEE Photon. Technol. Lett. 2, 352 (1990).
[CrossRef]

Jackson, D. A.

X. Bao, D. J. Webb, D. A. Jackson, Opt. Lett. 18, 552 (1993).
[CrossRef] [PubMed]

X. Bao, D. J. Webb, D. A. Jackson, in Proceedings of the Ninth International Conference on Optical Fiber Sensors (Associazione Elettrotecnica ed Elettronica Italiana, Firenze, Italy, 1993), postdeadline paper 3.

Kurashima, T.

T. Kurashima, T. Horiguchi, M. Tateda, Opt. Lett. 15, 1038 (1990).
[CrossRef] [PubMed]

T. Kurashima, T. Horiguchi, M. Tateda, IEEE Photon. Technol. Lett. 2, 352 (1990).
[CrossRef]

Partt, D. J.

J. P. Dakin, D. J. Partt, G. W. Bibby, J. N. Ross, Electron. Lett. 21, 569 (1985).
[CrossRef]

Ross, J. N.

J. P. Dakin, D. J. Partt, G. W. Bibby, J. N. Ross, Electron. Lett. 21, 569 (1985).
[CrossRef]

Tateda, M.

T. Kurashima, T. Horiguchi, M. Tateda, IEEE Photon. Technol. Lett. 2, 352 (1990).
[CrossRef]

T. Kurashima, T. Horiguchi, M. Tateda, Opt. Lett. 15, 1038 (1990).
[CrossRef] [PubMed]

Webb, D. J.

X. Bao, D. J. Webb, D. A. Jackson, Opt. Lett. 18, 552 (1993).
[CrossRef] [PubMed]

X. Bao, D. J. Webb, D. A. Jackson, in Proceedings of the Ninth International Conference on Optical Fiber Sensors (Associazione Elettrotecnica ed Elettronica Italiana, Firenze, Italy, 1993), postdeadline paper 3.

Electron. Lett. (1)

J. P. Dakin, D. J. Partt, G. W. Bibby, J. N. Ross, Electron. Lett. 21, 569 (1985).
[CrossRef]

IEEE Photon. Technol. Lett. (1)

T. Kurashima, T. Horiguchi, M. Tateda, IEEE Photon. Technol. Lett. 2, 352 (1990).
[CrossRef]

Opt. Lett. (2)

Other (1)

X. Bao, D. J. Webb, D. A. Jackson, in Proceedings of the Ninth International Conference on Optical Fiber Sensors (Associazione Elettrotecnica ed Elettronica Italiana, Firenze, Italy, 1993), postdeadline paper 3.

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Figures (4)

Fig. 1
Fig. 1

Experimental arrangement: D’s, photodetectors; AOM, acousto-optic modulator; DC’s, directional couplers. T denotes temperature sensing, and S denotes strain sensing. Experimental details of the unit used to impose temperature and strain variations on the fibers is described in the text.

Fig. 2
Fig. 2

Oscilloscope traces showing cw beam intensity monitored at photodetector D2, with the cw frequency set to maximize the Brillouin loss in various sections of the fiber in chamber 1 for different environmental conditions: (a) temperature 40 °C, time scale 50 μs/division; (b) fiber section 3–4 at a temperature of 40 °C; time scale 2 μs/division; (c) fiber section 1–2 at strain of 100 μ at 40 °C; time scale 2 μs/division; (d) fiber section 1–2 strain of 50 μ at 40 °C; time scale 0.5 μs/division.

Fig. 3
Fig. 3

Laser beat frequency giving maximum Brillouin loss for the fibers: (a) in fiber stretching unit 1 as a function of additional strain at a temperature of 18 °C, (b) in chamber 1 as a function of different temperatures at very low strain.

Fig. 4
Fig. 4

Laser beat frequency giving maximum Brillouin loss for the fibers in fiber stretching unit 1 as a function of additional strain at different chamber 1 temperatures.

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