Abstract

A new triangular topology for a bulk-optic Faraday current sensor is presented with a demonstrated resolution of 20mA/Hz over a measurement range of 1 to 3000 A. The sensitivity of the system is 2.35 × 10−5 rad/A. This sensor is relatively easy to fabricate and overcomes problems encountered with the use of current sensors based on bulk-optic square configurations and all-fiber systems.

© 1992 Optical Society of America

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References

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  1. G. W. Day, in Optical Fiber Sensors, Vol. 44 of Springer Series in Physics (Springer-Verlag, Berlin, 1988), p. 250.
    [CrossRef]
  2. A. J. Rogers, Int. J. Optoelectron. 3, 391 (1988).
  3. Y. N. Ning, B. C. B. Chu, D. A. Jackson, Opt. Lett. 16, 1996 (1991).
    [CrossRef] [PubMed]
  4. S. P. Bush, D. A. Jackson, Opt. Lett. 16, 995 (1991).
    [CrossRef]
  5. A. H. Rose, M. N. Deeter, G. W. Day, in Proceedings of 8th Optical Fiber Sensors Conference (Institute of Electrical and Electronics Engineers, New York, 1992), p. 394.
    [CrossRef]
  6. P. R. Former, F. C. Johoda, Appl. Opt. 27, 3088 (1988).
    [CrossRef]
  7. A. J. A. Bruinsma, T. M. J. Jongeling, in Optical Fiber Sensors: Systems and Applications (Artech, Dedham, Mass., 1989), Chap. 19, p. 747.
  8. A. M. Smith, Opt. Lasers Technol. 12, 25 (1980).
    [CrossRef]

1991

1988

P. R. Former, F. C. Johoda, Appl. Opt. 27, 3088 (1988).
[CrossRef]

A. J. Rogers, Int. J. Optoelectron. 3, 391 (1988).

1980

A. M. Smith, Opt. Lasers Technol. 12, 25 (1980).
[CrossRef]

Bruinsma, A. J. A.

A. J. A. Bruinsma, T. M. J. Jongeling, in Optical Fiber Sensors: Systems and Applications (Artech, Dedham, Mass., 1989), Chap. 19, p. 747.

Bush, S. P.

Chu, B. C. B.

Day, G. W.

G. W. Day, in Optical Fiber Sensors, Vol. 44 of Springer Series in Physics (Springer-Verlag, Berlin, 1988), p. 250.
[CrossRef]

A. H. Rose, M. N. Deeter, G. W. Day, in Proceedings of 8th Optical Fiber Sensors Conference (Institute of Electrical and Electronics Engineers, New York, 1992), p. 394.
[CrossRef]

Deeter, M. N.

A. H. Rose, M. N. Deeter, G. W. Day, in Proceedings of 8th Optical Fiber Sensors Conference (Institute of Electrical and Electronics Engineers, New York, 1992), p. 394.
[CrossRef]

Former, P. R.

Jackson, D. A.

Johoda, F. C.

Jongeling, T. M. J.

A. J. A. Bruinsma, T. M. J. Jongeling, in Optical Fiber Sensors: Systems and Applications (Artech, Dedham, Mass., 1989), Chap. 19, p. 747.

Ning, Y. N.

Rogers, A. J.

A. J. Rogers, Int. J. Optoelectron. 3, 391 (1988).

Rose, A. H.

A. H. Rose, M. N. Deeter, G. W. Day, in Proceedings of 8th Optical Fiber Sensors Conference (Institute of Electrical and Electronics Engineers, New York, 1992), p. 394.
[CrossRef]

Smith, A. M.

A. M. Smith, Opt. Lasers Technol. 12, 25 (1980).
[CrossRef]

Appl. Opt.

Int. J. Optoelectron.

A. J. Rogers, Int. J. Optoelectron. 3, 391 (1988).

Opt. Lasers Technol.

A. M. Smith, Opt. Lasers Technol. 12, 25 (1980).
[CrossRef]

Opt. Lett.

Other

A. H. Rose, M. N. Deeter, G. W. Day, in Proceedings of 8th Optical Fiber Sensors Conference (Institute of Electrical and Electronics Engineers, New York, 1992), p. 394.
[CrossRef]

A. J. A. Bruinsma, T. M. J. Jongeling, in Optical Fiber Sensors: Systems and Applications (Artech, Dedham, Mass., 1989), Chap. 19, p. 747.

G. W. Day, in Optical Fiber Sensors, Vol. 44 of Springer Series in Physics (Springer-Verlag, Berlin, 1988), p. 250.
[CrossRef]

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Figures (6)

Fig. 1
Fig. 1

Triangular sensor element. Wi and Wo are the entrance and exit windows; T1 and T2 are the two polished corners; and θ1 and θ2 are the angles of incidence of the light at T1 and T2, respectively. The optimum condition corresponds to θ1 = θ2 = θc, the critical angle.

Fig. 2
Fig. 2

Computer simulation results on the variation of sensitivity as a function of the deviation from critical angle reflection, Δθ = θcθi.

Fig. 3
Fig. 3

Optical system. GT, Glan–Thompson polarizer; λ/2, half-wave plate; WP, Wollaston prism; PD, photo-detector; I1 and I2, respective intensities of the orthogonal states; S, output signal from the signal processing unit. In a practical system fiber-optic links would be used to connect the input and output signals to the sensor to enable remote operation at high potential.

Fig. 4
Fig. 4

System response and rotation of azimuth of the output light as a function of the equivalent dc current (NC = 30).

Fig. 5
Fig. 5

Current sensitivity of the system at a frequency of 30 Hz (□), 60 Hz (+), and 90 Hz (○) (NC = 1).

Fig. 6
Fig. 6

Frequency response of the system for a fixed input current (NC = 1).

Equations (4)

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Φ F = l V H · d l ,
E out = F ( ϕ 3 ) R 2 F ( ϕ 2 ) R 1 F ( ϕ 1 ) E in ,
F ( ϕ n ) = [ cos ϕ n sin ϕ n - sin ϕ n cos ϕ n ] ,             n = 1 , 2 , 3 ; R m = [ ρ s m 0 0 ρ p m ] ,             m = 1 , 2 ;
Φ F = V N C I ,

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