Current measurement method and device based on a fiber optic...

Details Current measurement method and device based on a fiber optic... Current measurement method and device based on a fiber optic...

2006-09-05

2006-09-05

Lee, Hwa (Andrew) (Department: 2877)

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

C356S491000

Reexamination Certificate

active

07102757

ABSTRACT:
A device for current measurement based on a fiber-optic in-line Sagnac interferometer includes a birefringence phase modulator for non-reciprocal phase modulation of two orthogonal polarization modes of a light beam passing through the interferometer. The phase modulator is a digital phase modulator that is directly digitally drivable to permit simplification of the corresponding signal processing or driving electronics unit.

REFERENCES:
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patent: 5644397 (1997-07-01), Blake
patent: 6301400 (2001-10-01), Sanders
patent: 19808517 (1999-09-01), None
patent: 9803895 (1998-01-01), None
J. Blake et al., “In-Line Sagnac Interferometer for Magnetic Field Sensing”,Proc. SPIE, vol. 2360 (1994), pp. 419-422.
G. Frosio et al., “Reciprocal Reflection Interferometer For a Fiber-Optic Faraday Current Sensor”,Applied Optics/1., vol. 33, No. 25 (Sep. 1994), pp. 6111-6122.
S. Short et al., “Elimination of Birefringence Induced Scale Factor Errors in the In-Line Sagnac Sensor”,Journal of Lightwave Technology, vol. 16, No. 10 (Oct. 1998), pp. 1844-1850.
K. Bohnert et al., “Field Test of Interferometric Optical Fiber High-Voltage and Current Sensors”,Tenth International Conference on Optical Fiber Sensors(Oct. 11-13, 1994)Glasgow, Scotland/SPIE-The International Society for Optical Engineering, vol. 2360, pp. 16-19.
K. Bohnert et al., “Field Test of Interferometric Optical Fiber High-Voltage and Current Sensors”,Tenth International Conference on Optical Fiber Sensors(Oct. 11-13, 1994)Glasgow, Scotland/SPIE-The International Society for Optical Engineering, vol. 2360, pp. 16-19.

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