Verdet constant dispersion in annealed optical fiber current sensors

Abstract

Abstract-The Verdet constant in annealed optical fiber current sensors has been measured at wavelengths from 636 to1320 nm. The measurements are fitted to two models, one classical and the other an expansion of the classical model that includes a nonlinear term. These measurements and models are compared to previous measurements made in optical fiber and bulk SiO 2.Our measurements have an average accuracy of 60.6% and an average measurement uncertainty of 60.5% over the 636 to 1320 nm range.

Optical fiber current sensors in high electric field environments

“…(The Verdet constant at 636 nm is rad/A [32].) With 2.48 kV rms applied to the ring ( kV/m rms) is about 38 mrad.…”

“…For example, a fiber sensor, with and operating at 830 nm [11], placed in a GIS with 550 kV rms, 4.5 kA rms, operating at 60 Hz, would have a 0.5-m diameter outer conductor [31] so that m. At 830 nm, rad/A [32], so that at full current is 93 mrad. With MV/m rms, at full voltage, is 460 mrad.…”

Nonlinearity test and compensation of the passive AFOCT's scale factor

“…V is the verdet constant of the sensing fiber [6], N is the turns of the fiber coil, I pmax is the amplitude of the primary current and f is the frequency. If …”

Dispersion-shifted fiber polarization scrambler based on Faraday effect

“…This letter presents the construction and performance measures of a polarization scrambler based on Faraday rotation [3] in optical fiber. A light beam, travelling through a fiber with a magnetic field present, will have its SOP rotated an angle equal to (1) Manuscript received March 8, 1999; revised April 5, 1999.…”

“…The parameter that characterizes the performance of a scrambler is the mean degree of polarization ( ), which is defined [6] analogous to the degree of polarization for partially polarized light: (3) where are the time averages of the Stokes parameters over a full scrambling period. It is important to remark that, strictly speaking, light is not depolarized, so, its instantaneous DOP will always be near the unity.…”