CAJ | 학술논문

介绍了一种基于石英晶体逆压电效应的光纤电压互感器(FOVT)。传感头由两段分别缠绕在石英晶体上的等长保偏光纤构成，两段光纤之间90°熔接实现两正交偏振模式互补，采用非互易的法拉第旋光器实现In-line Sagnac反射式干涉仪结构。阐述了其工作原理，借助琼斯矩阵得到其干涉表达式，并推导出检测相位与待测电压成线性关系，结合数字闭环模型计算出互感器变比，并以此为标准衡量互感器测量精度及稳定性。实验结果表明：待测电压大于3000 V时，变比的非线性误差小于0.2%。
개소료일충기우석영정체역압전효응적광섬전압호감기(FOVT)。전감두유량단분별전요재석영정체상적등장보편광섬구성，량단광섬지간90°용접실현량정교편진모식호보，채용비호역적법랍제선광기실현In-line Sagnac반사식간섭의결구。천술료기공작원리，차조경사구진득도기간섭표체식，병추도출검측상위여대측전압성선성관계，결합수자폐배모형계산출호감기변비，병이차위표준형량호감기측량정도급은정성。실험결과표명：대측전압대우3000 V시，변비적비선성오차소우0.2%。
A reflective Sagnac interferometer-type fiber optical voltage sensor based on the converse piezoelectric effect of quartz crystal was demonstrated. The sensor head consisted of two polarization-maintaining fiber sections with equal length bonded to the circumferential surface of each quartz transducer. The two fiber sections were spliced by 90°to balance differential group delay induced by the intrinsic birefringence. A non-reciprocal faraday rotator was utilized to interrogate the quasi-in-line Sagnac-type reflective interferometer. The principle of the sensor was investigated and the expression of the interference was deduced by using Jones Matrix. The linear relationship between the detectable phase and the voltage to be measured was confirmed by analyzing the mathematic model of sensor head and the scale factor of the sensor was calculated associated with the digital closed-loop model. The experiment shows that the nonlinear error of the scale factor is less than 0.2% when the measured voltage is more than 3 000 V.