HIGH VOLTAGE FIBER OPTIC SENSOR FOR THE MEASUREMENT OF AN ALTERNATING ELECTRIC FIELD

摘要

A method for measuring an alternating electric field is disclosed. The method includes realizing a first diffraction grating in a first location, in a core of a silica-based optical fiber, and measuring a peak reflection wavelength of the first diffraction grating. The method also includes positioning the optical fiber along a direction having a non-zero component of an electrical field generated by an alternating voltage to be measured, and coupling a substantially monochromatic light to said optical fiber surrounded by the electric field. The method further includes measuring a parameter dependent on a shift of the peak reflection wavelength due to intrinsic mechanical deformation or refractive index change of the material in which the optical fiber and the diffracting grating are realized due to the alternating electric field, and calculating a value of the electric field causing such a measured deformation or refractive index change.

主权项

1. A method of measuring an alternating electric field, wherein said method includes:
realizing a first diffraction grating in a first location, in a core of a silica-based optical fiber; measuring a peak reflection wavelength of said first diffraction grating; positioning said optical fiber along a direction having a non-zero component of an electrical field generated by an alternating voltage to be measured; coupling a substantially monochromatic light to said optical fiber surrounded by said electric field; measuring a parameter dependent on the shift of said peak reflection wavelength due to intrinsic mechanical deformation or refractive index change of the material in which said optical fiber and said first diffracting grating are realized due to the alternating electric field to which the material itself in which the optical fiber and first diffraction grating are realized is subjected to; and calculating a value of the electric field causing such a measured deformation or refractive index change.