Fiber-optic current sensor

Details Fiber-optic current sensor Fiber-optic current sensor

2006-07-11

2006-07-11

Nguyen, Vinh (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Using radiant energy

C324S244100, C356S477000, C356S483000, C250S227190, C385S012000, C385S014000

Reexamination Certificate

active

07075286

ABSTRACT:
An optical current sensor having a reflection interferometer (1, 10) has, in its fiber-optic lead (2), a polarization-maintaining first fiber branch (20) for two forward-traveling orthogonally polarized waves and a polarization-maintaining second fiber branch (20′) for two backward-traveling orthogonally polarized waves. In this case, the two fiber branches (20, 20′) are connected to one another via a coupler (8) on the sensor side. The first fiber branch (20) is connected to a light source (4) and the second fiber branch (20′) is connected to the detector (5). A means for phase shifting (7) is funcionally connected to at least one of the fiber branches (20, 20′). It is thus possible to achieve a quasi-static control of the phase shift of the waves, so that less stringent requirements can be made of the means for phase shifting than of the phase modulators that are usually used in current sensors of this type.

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Guido Frosio and René Dändliker, “Reciprocal Reflection Interferometer for a Fiber-Optic Faraday Current Sensor”, Applied Optics, vol. 33, No. 25, Sep. 1, 1994, pp. 6111-6122.

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