Fiberoptic apparatus for measuring electromagnetic field intensi

Details Fiberoptic apparatus for measuring electromagnetic field intensi Fiberoptic apparatus for measuring electromagnetic field intensi

1991-11-04

1994-01-11

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

25022714, 356351, G01R 3302, G02B 514, H01J 516, G01D 534

Patent

active

052784991

ABSTRACT:
An electromagnetic field intensity measuring apparatus comprises a sensor located in the electromagnetic field measuring place for receiving the measuring light from the optical fiber, the sensor being adapted to modulate the measuring light entering the sensor depending on the intensity of the electromagnetic field, the modulated light being then re-applied to the optical fiber; a polarization rotating device located between the measuring light generating device and the optical fiber, the polarization rotation device being operative to cause the polarized wavefront of the measuring light passed therethrough to rotate a given angle in the direction of passage; and a polarization beam splitter disposed between the measuring light generating device and the polarization rotating device, the polarization beam splitter being operative to permit only the measuring light from said measuring light generating device to pass through said polarization beam splitter and also to reflect the modulated measuring light inputted through the polarization rotating device in a predetermined direction. The electromagnetic field intensity in the measuring place can be calculated, based on the amplitude of the measuring light reflected by the polarization beam splitter.

REFERENCES:
patent: H371 (1987-11-01), Bobb
patent: 4533829 (1985-08-01), Miceli et al.
patent: 4560867 (1985-12-01), Papuchan et al.

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