Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1983-07-22
1985-09-03
Westin, Edward P.
Electricity: measuring and testing
Magnetic
Magnetometers
250225, 250231R, 350377, 324 96, 356364, G01R 3302
Patent
active
045395217
ABSTRACT:
A magnetic field measuring device comprises a laser light source delivering laser light having two components of first and second frequencies; a beam splitter for dividing the laser light into two portions; a quarter wave plate provided to receive one portion of the laser light; a Faraday rotator provided to receive the output of the quarter wave plate and rotates the polarized direction thereof by an angle corresponding to a magnetic field applied thereto; first and second optical analyzers for extracting from the other portion of the laser light and the output of the Faraday rotator, first and second components of an equal frequency corresponding to the difference of the first and second frequencies, respectively; first and second photoelectric converters for converting the outputs of the first and second optical analyzers into first and second electric signals, respectively; and circuitry for comparing the first and second electric signals thereby to produce an output directly proportional to the magnetic field applied to the Faraday rotator.
REFERENCES:
patent: 2442396 (1948-06-01), Bubb et al.
patent: 3693082 (1972-09-01), Jaecklin
Bucaro et al., "Measurement of Sensitivity of Optical Fibers for Acoustic Detection", Applied Optics, vol. 18, No. 6 (3/15/79), pp. 938-940.
Rapp et al., "Magneto Optical Current Transformer", Applied Optics, vol. 19, No. 22 (11/15/80), pp. 3729-3734.
Tokyo Shibaura Denki Kabushiki Kaisha
Westin Edward P.
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