Apparatus for reducing magnetic field-induced bias errors in a f

Details Apparatus for reducing magnetic field-induced bias errors in a f Apparatus for reducing magnetic field-induced bias errors in a f

1993-02-12

1994-07-26

Bovernick, Rodney B.

Optical waveguides

Optical waveguide sensor

385 13, 385123, 3242441, 356350, G01B 902

Patent

active

053332148

ABSTRACT:
Apparatus for suppressing the bias errors induced by the Faraday effect in the output of a sensor coil exposed to a magnetic field. Arrangements are formed at two leads of the sensor coil for compensating the bias shifts. One of such arrangements comprises at least one loop of optical fiber for compensating the effect induced by the magnetic field component oriented transverse to the axis of the sensor coil while the other comprises at least one loop oriented at a predetermined pitch angle for compensating the effect induced by a magnetic field component along the axis. In each case, a predetermined degree of twist of a preselected fiber twist mode is imposed upon the compensator loop for creating a counteracting, corrective Faraday effect. Cross-coupling does not occur between the two compensators as their twist rate perodicities are unequal.

REFERENCES:
patent: 4743115 (1988-05-01), Arditty et al.
patent: 4793708 (1988-12-01), Bednarz
patent: 5168539 (1992-12-01), Negishi et al.
"Drift of an Optical Fiber Gyroscope Caused by the Faraday Effect and Its Reduction by Use of a Polarizing Fiber", Hotate et al, Optica Acta, 1986, vol. 33, No. 12, pp. 1553-1561.
"Drift of an Optical Fiber Gyroscope Caused by the Faraday Effect: Experiment", Hotate et al, Journal of Lightwave Technology, vol. LT-5, No. 7, Jul. 1987, pp. 997-1001.

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