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Sensors 2017, 17(8), 1723; doi:10.3390/s17081723

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

School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China
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Received: 19 May 2017 / Revised: 19 July 2017 / Accepted: 25 July 2017 / Published: 27 July 2017
(This article belongs to the Section Physical Sensors)
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Abstract

The influence of optical parameters on the performance of closed-loop optical voltage sensors (OVSs) based on Pockels effect is analyzed and a control algorithm is proposed to suppress the nonlinearity caused by the unideal parameters of optical devices for optimizing the detection precision of OVSs. First, a quantified model of the feedback phase demonstrates how the optical parameters of optical devices (including light source, polarizer, 45° fusion point, Faraday rotator and half-wave plate) result in the nonlinearity of closed-loop OVSs. Then, the parameter indexes of different optical devices are put forward to instruct the manufacturing process of the optical system. Furthermore, a closed-loop control algorithm is investigated to improve the measurement accuracy of nonlinear OVSs considering the unideal parameters. The experiment results indicate that additional bias caused by undesirable optical parameters is obviously decreased so that the measurement accuracy of OVSs satisfies the demand of IEC60044-3 for 0.1 level measurement accuracy, which verifies the effectiveness and correctness of the methods for suppressing the impact of unideal optical parameters on OVSs. View Full-Text
Keywords: optical voltage sensor; detection accuracy; closed-loop detection optical voltage sensor; detection accuracy; closed-loop detection
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Deng, W.; Li, H.; Zhang, C.; Wang, P. Optimization of Detection Accuracy of Closed-Loop Optical Voltage Sensors Based on Pockels Effect. Sensors 2017, 17, 1723.

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