Patent ID: 6495999
Filing Date: 2002-12-17
Classification: G01R

Abstract:
A method of measuring a magnetic field, which comprises:coupling light having a first component with a first wavelength and a second component with a second wavelength different from the first wavelength into a transmission path leading to a Faraday element subjected to a magnetic field; simultaneously transmitting the first and second components together through a wavelength-dependent polarizing optical fiber to the Faraday element, such that the light coupled from the optical fiber into the Faraday element has a linearly polarized first light component with the first wavelength and a substantially unpolarized second component with the second wavelength, whereby the first light component is linearly polarized in the polarizing optical fiber; optically splitting a light signal coupled out of the Faraday element into a first light signal component with the first wavelength and a second light signal component with the second wavelength; deriving a first measurement signal from the first light signal component and a second measurement signal from the second light signal component, and generating from the first and second measurement signals a corrected measurement signal.