Analysis of the Light Propagation Model of the Optical Voltage Sensor for Suppressing Unreciprocal Errors

Abstract

An improved temperature-insensitive optical voltage sensor (OVS) with a reciprocal dual-crystal sensing method is proposed. The inducing principle of OVS reciprocity degradation is expounded by taking the different temperature fields of two crystals and the axis-errors of optical components into consideration. The key parameters pertaining to the system reciprocity degeneration in the dual-crystal sensing unit are investigated in order to optimize the optical sensing model based on the Maxwell's electromagnetic theory. The influencing principle of axis-angle errors on the system nonlinearity in the Pockels phase transfer unit is analyzed. Moreover, a novel axis-angle compensation method is proposed to improve the OVS measurement precision according to the simulation results. The experiment results show that the measurement precision of OVS is superior to ±0.2% in the temperature range from −40 °C to +60 °C, which demonstrates the excellent temperature stability of the designed voltage sensing system.

Optimization of Detection Accuracy of Closed-Loop Optical Voltage Sensors Based on Pockels Effect

“…A quasi-reciprocal reflective optical circuit adopting the Faraday rotator was presented to promote the reciprocity of polarized light in the transmission path of OVSs [8], and the voltage sensing scheme with dual-crystal structure was proposed to eliminate the additional birefringence of Bi 4 Ge 3 O 12 (BGO) crystal for guaranteeing the reciprocity of the voltage sensing process [9]. Then, the optimization methods of a reciprocal dual-crystal sensing system were researched for optimizing the temperature performance of OVSs in an engineering environment [10]. Xia et al introduced the thermodynamic model including an electric field, stress and temperature field, and analyzed the impact of optical properties such as temperature and sulfur hexafluoride (SF6) for suppressing the environmental factors [11].…”