Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1990-12-21
1991-10-01
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
324 72, 324 725, 3242441, 25022714, G01R 3102
Patent
active
050536931
ABSTRACT:
In an interferometric fiberoptic sensor with homodyne detection for measuring electrical fields or voltages, the measurement signal is compensated separately from operating point control. The measurement signal originating from the electrical field is compensated in a piezoelectric modulator (5) which consists of modulator elements which are identical with the at least one sensor element (3) with respect to material, geometric shape and crystal orientation. Additional separate apparatus (4) with a sufficiently large phase swing are provided for operating point control. Modulator element and sensor element (3) are essentially at the same temperature so that the temperature-dependence of the matter constants of the sensor element and the temperature-dependence of the fiber interferometer are eliminated. The sensor preferably operates in accordance with the principle of a fiberoptic two-mode interferometer.
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Applied Optics, vol. 19, No. 17, Sep. 1, 1980, pp. 2926-2929, D. A. Jackson, et al., "Elimination of Drift in a Single-Mode Optical Fiber Interferometer Using a Piezoelectrically Stretched Coiled Fiber".
IEEE Journal of Quantum Electronics, vol. QE-18, No. 4, Apr. 4, 1982, pp. 626-665, T. G. Giallorenzi, et al., "Optical Fiber Sensor Technology".
Bohnert Klaus
Buser Werner
Asea Brown Boveri Ltd.
Burns William J.
Wieder Kenneth A.
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