Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1987-07-22
1990-01-16
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
324158R, 250214R, G01R 3100, G02F 131
Patent
active
048946087
ABSTRACT:
An electric current detector has a light source for generating light having substantially linear polarization and a predetermined polarization direction, a material substantially transparent to the light, the material having at least one characteristic direction, and the material exhibiting the Faraday effect in response to a magnetic field generated by the electric current. Also the light is launched into the material, and a predetermined angle established between the polarization direction and the characteristic direction, the predetermined angle chosen to permit separation of a rotation of the polarization of the light by the Faraday effect from polarization effects on the light by a birefringence of the material. A value of 22.5.degree. for the magnitude of the predetermined angle permits a separation of the rotation of the polarization due to the Faraday effect from polarization effects due to a birefringence of the material.
REFERENCES:
patent: 4348587 (1982-09-01), Tangonan et al.
patent: 4498348 (1985-02-01), Wesson
patent: 4540937 (1985-09-01), Asars
patent: 4563639 (1986-01-01), Langeac
patent: 4563646 (1986-01-01), Desormiere
patent: 4564754 (1986-01-01), Sata et al.
patent: 4598996 (1986-07-01), Tanuchi
patent: 4612500 (1986-09-01), Chen et al.
patent: 4613811 (1986-09-01), Vaerewyck et al.
patent: 4615582 (1986-10-01), Lefevre et al.
patent: 4683421 (1987-07-01), Miller et al.
patent: 4698497 (1987-10-01), Miller et al.
patent: 4755665 (1988-07-01), Ulmer, Jr. et al.
Midwinter; "Optical Fibers for Transmission"; John Wiley & Sons; 1979; pp. V, 309 and 333.
EIA Standard RS-455-5; Electronic Industires Association; Sep. 1982; pp. 1, 19 and 20.
ANSI/EIA--RS-455-XX; American National Standards Inst.; pp. 3 and 4.
Rogers; "Method for Simultaneous Measurement of Current and Voltage on High Voltage Lines Using Optical Techniques"; PROC. IEEE, vol. 123, No. 10, Oct. 1976; pp. 957-960.
Chandler and Jahoda, Current Measurements by Faraday Rotation in Single--Mode OPtical Fibers, Rev. Sci. Instrum. 56(5), May, 1985, pp. 852-854.
Aben, Characteristic Directions in Optics of Twisted Birefringent Media, J. Opt. Soc. Am. A/vol. 3, No. 9, Sep. 1986, pp. 1414-1421.
Ulrich et al., Bending--Induced Birefrigence in Single--Mode Fibers, Optics Letters, vol. 5, No. 6, Jun. 1980, pp. 273-275.
Tabor and Chen, Electromagnetic Propagation through Materials Possessing Both Faraday Rotation and Birefringence: Experiments with Ytterbium Orthoferrite, Journal of Applied Physics, vol. 40, No. 7, Jun. 1969, pp. 2760-2765.
Day, et al., Design and Performance of Tuned Fiber Coil Isolators, Journal of Light Wave Technology, vol. LT-2, No. 1, Feb. 1984, pp. 56-60.
Malewski, Erickson, Measurement Applications, IEEE Tutorial Course, Fiber Optic Application in Electrical Power Systems, 1985.
Chandler, Forman, Jahoda, Klare, Fiber--Optic Heterodyne Phase--Shift Measurement of Plasma Current, Applied Optics, vol. 25, No. 11, Jun. 1986, pp. 1770-1774.
Kanoi, Takahashi, Sato, Higaki, Mori, Okumura, Optical Voltage and Current Measuring System for Electric Power Systems, IEEE Transactions on Power Delivery, vol. PWRD-1, No. 1, Jan. 1986, pp. 91-97.
Balteau Applies Fibre Optic Sensors to Instrument Transformers, Electrical Review International, Nov. 1986, p. 50.
Optics of Crystals, Chapter 14, "Optics of Crystals", from Principles of Optics, Third Edition, M. Born and E. Wolf, Pergamon Press, 1965.
Eisenzopf Reinhard J.
Johnston A. Sidney
Lowe, Jr. James E.
Nguyen Vinh P.
Square D Company
LandOfFree
Electric current sensor using the faraday effect does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric current sensor using the faraday effect, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric current sensor using the faraday effect will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1337163