Method for optically measuring electric field and optical voltag

Details Method for optically measuring electric field and optical voltag Method for optically measuring electric field and optical voltag

1990-07-11

1992-05-05

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Using radiant energy

324 725, 3242441, G01R 1900

Patent

active

051111357

ABSTRACT:
A method for optically measuring an AC electric field or an AC voltage is disclosed. According to the method, a light beam emitted from a light-emitting portion is transmitted through a sensing head including a Pockel's-effect element while an AC electric field to be measured is applied to the Pockel's-effect element, so that the light beam is modulated by the applied AC electric field. The transmitted light beam is then received by a light-detecting portion, while in turn produces an electric signal corresponding to the received light beam. From the electric signal are selected a first component (E.omega.) having a same angular frequency as that of the AC electric field, and a second component (E.sub.2 .omega.) having an angular frequency which is two times that of the AC electric field. Then, a ratio (E.sub.2 .omega./E.omega.) of the second component to the first component is calculated so as to determine a strength of the AC electric field or a magnitude of the AC voltage which produces the AC electric field, based on the ratio (E.sub.2 .omega.E/.omega.).

REFERENCES:
patent: 4531092 (1985-07-01), Shibano
patent: 4547729 (1985-10-01), Adolfson et al.
patent: 4563646 (1986-01-01), Desormiere
patent: 4631402 (1986-12-01), Nagatsuma
patent: 4956607 (1990-09-01), Abe et al.

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