Patent ID: 6297625
Filing Date: 2001-10-02
Classification: G01R

Abstract:
A method for measuring a magnetic field, said method comprising the steps of:transmitting a first light signal having a first polarization and a first wavelength through an optical sensor in a first direction, said optical sensor exhibiting a Faraday effect and being arranged in a region of said magnetic field;passing said transmitted first light signal through a first analyzer set to a second polarization;sending said passed first light signal to a first optical detector for detecting said first light signal, said first optical detector responding only to said first wavelength and at least not significantly to a second wavelength;generating a first intensity signal corresponding to a light intensity of said detected first light signal;transmitting a second light signal having a third polarization and said second wavelength different from said first wavelength through said optical sensor in a second direction opposite said first direction;passing said transmitted second light signal through a second analyzer set to a fourth polarization;sending said passed second light signal to a second optical detector for detecting said second light signal, said second optical detector responding only to said second wavelength and at least not significantly to said first wavelength;generating a second intensity signal corresponding to a light intensity of said detected second light signal; andderiving a measuring signal containing information about said magnetic field from said first intensity signal and said second intensity signal.