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Applied Optics

Applied Optics


  • Vol. 41, Iss. 25 — Sep. 1, 2002
  • pp: 5391–5397

Simultaneous measurement of current and voltage by use of one bismuth germanate crystal

Changsheng Li and Toshihiko Yoshino  »View Author Affiliations

Applied Optics, Vol. 41, Issue 25, pp. 5391-5397 (2002)

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An optical fiber sensor is presented that allows current and voltage to be measured simultaneously by use of only one block of bismuth germanate crystal. The polarized light from the sensing crystal is split into two light beams: One beam is utilized for current measurement based on the Faraday effect, and the other one is utilized for voltage measurement based on the Pockels effect. Compared with the existing optical sensors that can measure current and voltage simultaneously, this sensor is simple and inexpensive and allows measurement of electric power. The simultaneous measurements of ac electric current from 0.05 to 10 A, voltage from 1 to 235 V, and power from 2 to 1000 W have been achieved with good linear-response characteristics. The input characteristics and measurement uncertainties that are due to the nonlinear error of the sensing system are also discussed.

© 2002 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.4820) Instrumentation, measurement, and metrology : Optical systems
(230.2090) Optical devices : Electro-optical devices
(230.2240) Optical devices : Faraday effect
(260.5430) Physical optics : Polarization

Original Manuscript: January 17, 2002
Revised Manuscript: May 15, 2002
Published: September 1, 2002

Changsheng Li and Toshihiko Yoshino, "Simultaneous measurement of current and voltage by use of one bismuth germanate crystal," Appl. Opt. 41, 5391-5397 (2002)

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