Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1990-05-16
1991-10-22
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
359246, 359279, G01R 33032
Patent
active
050598945
ABSTRACT:
A voltage measuring system utilizes an electro-optic voltage transducer (EOVT) in which two beams of polarized light injected into one end of an electro-optic crystal parallel to its fourfold axis of rotary inversion are reflected back through the crystal by a prism so that the optical inputs and outputs, including polarizers, collimators, optic fibers, and fractional wave plates where required, are all located at one end of the crystal, which is preferably connected to the low side of the voltage to be measured. The EOVT is supported substantially only at the end with the optical inputs and outputs, with the free end on which the prism is mounted being substantially unsupported. In one embodiment of the invention, a triangular prism is used to reflect the polarized light back through the prism, in another a pyramid prism is utilized. In the latter case, the material of the prism and, if desired, a metal coating applied to the reflecting faces of the prism, can be selected so as to produce a 1/4 wave phase shift between components of the two polarized light beams parallel to the fast and slow axes, which is needed in addition to the phase shift resulting from the measured voltage for generating an unambiguous representation of voltages exceeding the halfway voltage of the electro-optic crystal, thereby eliminating the need for fractional wave plates. A partial or full metal coating on the prism can be used to electrically connect a transparent electrode located between the prism and the crystal to a conducting spring bearing against the prism for applying the voltage to be measured to the free end of the electro-optic crystal.
REFERENCES:
patent: 4629323 (1986-12-01), Matsumoto
patent: 4864222 (1989-09-01), Aoshima et al.
patent: 4904931 (1990-02-01), Miller
ABB Power T&D Company Inc.
Karlsen Ernest F.
Westerhoff Richard V.
LandOfFree
Electro-optic voltage measuring appartaus with single ended opti does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electro-optic voltage measuring appartaus with single ended opti, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electro-optic voltage measuring appartaus with single ended opti will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-111006