Title :
Optical voltage sensor using a pulse-controlled electrooptic quarter waveplate
Author :
Li, Changsheng ; Cui, Xiang ; Yamaguchi, Ichirou ; Yokota, Masayuki ; Yoshino, Toshihiko
Author_Institution :
Dept. of Electr. Eng., North China Electr. Power Univ., Baoding, China
Abstract :
An optical voltage sensor is presented which can be used for the measurement of dc voltage by use of a Pockels crystal associated with a pulse-controlled electrooptic quarter waveplate. The measurand dc voltage signal is converted into the amplitude of an ac pulse-modulated voltage-sensing signal. Therefore, the output sensing signal is immune to electromagnetic interference owing to the applications of pulse modulation and lock-in amplifying techniques. In addition, the voltage-sensing signal is obtained from a single light path and free from light intensity fluctuations. The dc voltage of ±0.4 to ±180 V has been measured with 1.8% nonlinear error.
Keywords :
Pockels effect; electro-optical devices; optical sensors; voltage measurement; 0.4 to 180 V; AC pulse-modulated voltage-sensing signal; DC voltage measurement; DC voltage signal; Pockels crystal; Pockels effect; electromagnetic interference; light intensity fluctuations; lock-in amplifying techniques; nonlinear error; optical voltage sensor; output sensing signal; polarization converter; pulse modulation; pulse-controlled electrooptic quarter waveplate; single light path; Electromagnetic interference; Electromagnetic measurements; Electrooptic devices; Nonlinear optics; Optical pulses; Optical retarders; Optical sensors; Pulse amplifiers; Pulse measurements; Voltage measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2004.838128
