Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1982-04-23
1985-09-03
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
324 96, 350375, G01R 3300, G01R 1900
Patent
active
045395195
ABSTRACT:
In order to measure the intensity of an electric current utilizing the Faay effect, an optical path which is exposed to a magnetic field generated by the current is marked by an optical fiber which is laid in a number of windings in the shape of a coil. In order to minimize the disruptive effect of, for instance, elliptical eigen-birefringence of the fiber, or birefringence caused by the laying of the fiber on the zero point and the calibration factor of the device, the end of the optical fiber which is away from the input point is provided with a reflection unit which reflects back into the fiber the light which arrives there with the same polarization state with which it arrived at the reflection unit. A polarization measurement unit is used to record the polarization state of light flux which, after having traversed the optical fiber a total of twice, again emerges at the input point. The current intensity can then be derived from the change in the polarization state compared to the light which was input into the optical fiber at the input point.
REFERENCES:
patent: 3495189 (1970-02-01), Le Craw
patent: 3506929 (1970-04-01), Ballman et al.
patent: 4255018 (1981-03-01), Ulrich et al.
Rashleigh Scott C.
Ulrich Reinhard
Karlsen Ernest F.
Max-Planck-Gesellschaft zur Forderung der Wissenschaften e.v.
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