The present invention is relative to a method to measure an alternating electric field, wherein said method includes: Realizing a first diffraction grating (1) in a first location, in a core of a silica-based optical fiber (2); Measuring the peak reflection wavelength of said first diffraction grating (1); positioning said optical fiber (2) 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 (2) 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 (2) and said diffracting grating are realized due to the alternating electric field to which the material itself in which the optical fiber and diffraction grating are realized is subjected to; and Calculating a value of the electric field causing such a measured deformation or refractive index change.
High Voltage Fiber Optic Sensor for the Measurement of an Alternating Electric Field
MARIGNETTI, Fabrizio
2014-01-01
Abstract
The present invention is relative to a method to measure an alternating electric field, wherein said method includes: Realizing a first diffraction grating (1) in a first location, in a core of a silica-based optical fiber (2); Measuring the peak reflection wavelength of said first diffraction grating (1); positioning said optical fiber (2) 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 (2) 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 (2) and said diffracting grating are realized due to the alternating electric field to which the material itself in which the optical fiber and diffraction grating are realized is subjected to; and Calculating a value of the electric field causing such a measured deformation or refractive index change.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
