Abstract

In this work, we used PWM sampling for demodulation of a fiber-optic interferometric current transformer. The interference signal from a fiber-optic CT is sampled with PWM triggers that produce a 90-degree phase difference between two consecutively sampled signals. The current-induced phase is extracted by applying an arctangent demodulation and a phase unwrapping algorithm to the sampled signals. From experiments using the proposed demodulation, we obtained phase measurement accuracy and a linearity error, in AC current measurements, of ~2.35 mrad and 0.18%, respectively. The accuracy of the proposed method was compared with that of a lock-in amplifier demodulation, which showed only 0.36% difference. To compare the birefringence effects of different fiber-optic sensor coils, a flint glass fiber and a standard single-mode fiber were used under the same conditions. The flint glass fiber coil with a Faraday rotator mirror showed the best performance. Because of the simple hardware structure and signal processing, the proposed demodulation would be suitable for low-cost over-current monitoring in high voltage power systems.

© 2010 Optical Society of Korea

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    [CrossRef]

2009

S. H. Jeon and S. K. Gil, “Measurement of a mirror surface topography using 2-frame phase-shifting digital interferometry,” J. Opt. Soc. Korea 13, 245-250 (2009).
[CrossRef]

2008

M. O. Jeong, N. Kim, and J. H. Park, “Elemental image synthesis for integral imaging using phase-shifting digital holography,” J. Opt. Soc. Korea 12, 275-280 (2008).
[CrossRef]

2004

J. Zhongxie and M. Song, “Fiber grating sensor array interrogation with time-delayed sampling of a wavelength-scanned fiber laser,” IEEE Photon. Technol. Lett. 16, 1924-1926 (2004).
[CrossRef]

2002

K. Bohnert, P. Gabus, J. Nehring, and H. Brandle, “Temperature and vibration insensitive fiber-optic current sensor,” IEEE J. Lightwave Technol. Lett. 20, 267-276 (2002).
[CrossRef]

2001

J. Blake, “Fiber optic current sensor calibration,” in Proc. IEEE T&D Conference (Atlanta World Congress Center, USA, Oct. 2001), pp. 127-130.

2000

1998

Y. L. Lo, “In-fiber Bragg grating sensors using interferometric interrogations for passive quadrature signal processing,” IEEE Photon. Technol. Lett. 10, 1003-1005 (1998).
[CrossRef]

1997

K. Kurosawa, “Optical current transducers using flint glass fiber as the faraday sensor element,” Opt. Rev. 4, 38-44 (1997)
[CrossRef]

1996

G. W. Day, K. B. Rochford, and A. H. Rose, “Fundamentals and problems of fiber current sensors,” in Proc. 11th OFS Conference (Sapporo, Japan, May 1996), paper We1S1.

J. Blake, P. Tantaswadi, and R. T. DeCarvalho, “In-line Sagnac interferometer current sensor,” IEEE Trans. Power Deliv. 11, 116-121 (1996).
[CrossRef]

1988

A. J. Rogers, “Optical-fiber current measurement,” Int. J. Optoelectron. 3, 391-407 (1988).

1986

J. Barlow and D. N. Payne, “Production of single mode fibers with negligible intrinsic birefringence,” Electron. Lett. 17, 725-726 (1986).
[CrossRef]

1980

Appl. Opt.

Electron. Lett.

J. Barlow and D. N. Payne, “Production of single mode fibers with negligible intrinsic birefringence,” Electron. Lett. 17, 725-726 (1986).
[CrossRef]

IEEE J. Lightwave Technol. Lett.

K. Bohnert, P. Gabus, J. Nehring, and H. Brandle, “Temperature and vibration insensitive fiber-optic current sensor,” IEEE J. Lightwave Technol. Lett. 20, 267-276 (2002).
[CrossRef]

IEEE Photon. Technol. Lett.

Y. L. Lo, “In-fiber Bragg grating sensors using interferometric interrogations for passive quadrature signal processing,” IEEE Photon. Technol. Lett. 10, 1003-1005 (1998).
[CrossRef]

J. Zhongxie and M. Song, “Fiber grating sensor array interrogation with time-delayed sampling of a wavelength-scanned fiber laser,” IEEE Photon. Technol. Lett. 16, 1924-1926 (2004).
[CrossRef]

IEEE Trans. Power Deliv.

J. Blake, P. Tantaswadi, and R. T. DeCarvalho, “In-line Sagnac interferometer current sensor,” IEEE Trans. Power Deliv. 11, 116-121 (1996).
[CrossRef]

Int. J. Optoelectron.

A. J. Rogers, “Optical-fiber current measurement,” Int. J. Optoelectron. 3, 391-407 (1988).

Journal of the Optical Society of Korea

M. O. Jeong, N. Kim, and J. H. Park, “Elemental image synthesis for integral imaging using phase-shifting digital holography,” J. Opt. Soc. Korea 12, 275-280 (2008).
[CrossRef]

S. H. Jeon and S. K. Gil, “Measurement of a mirror surface topography using 2-frame phase-shifting digital interferometry,” J. Opt. Soc. Korea 13, 245-250 (2009).
[CrossRef]

Opt. Rev.

K. Kurosawa, “Optical current transducers using flint glass fiber as the faraday sensor element,” Opt. Rev. 4, 38-44 (1997)
[CrossRef]

Proc. 11th OFS Conference

G. W. Day, K. B. Rochford, and A. H. Rose, “Fundamentals and problems of fiber current sensors,” in Proc. 11th OFS Conference (Sapporo, Japan, May 1996), paper We1S1.

Proc. IEEE T&D Conference

J. Blake, “Fiber optic current sensor calibration,” in Proc. IEEE T&D Conference (Atlanta World Congress Center, USA, Oct. 2001), pp. 127-130.

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