基于λ/4波片的标度因数稳定性分析  

Analysis of Scale Factor Stability Based on λ/4 Waveplate

作　　者：李绪友[1] 魏义涛[1] 洪伟[1] 何周[1] 郝金会[1] 

机构地区：[1]哈尔滨工程大学自动化学院,哈尔滨150001

出　　处：《光电工程》2011年第11期1-5,共5页Opto-Electronic Engineering

基　　金：国家自然科学基金资助项目(60604019)

摘　　要：针对实际应用中由于光纤电流互感器λ/4波片误差容限较小导致标度因数不稳定的问题,提出了一种标度因数补偿的新方法,该补偿方法大大提高了波片的误差容限,从而有效地提高了光纤电流互感器的标度因数稳定性。通过理论分析,给出了λ/4 波片的理论模型,分析了要得到 0.2%及 0.01%的标度因数精度所要求的波片的对轴角度误差和相位延迟误差容限。应用峰值分割法对波片误差容限进行了补偿,结果表明,同补偿前的数据相比,当标度因数精度分别为0.2%和0.01%时,补偿后的对轴角度误差和相位延迟误差容限分别提高了约4.7倍和11倍,因此对于这两个不同的精度,光纤电流互感器的标度因数稳定性也同时分别提高了约4.7倍和 11倍。并且从数值上可以看出,所需的标度因数精度越高,补偿效果越明显。通过应用峰值分割法进行补偿,有效地减少了光纤电流互感器的标度因数不稳定性带来的测量精度误差。For the problem of small waveplate’s error tolerance in practical applications, which leads to instability of scale factor, a novel way of compensating scale factor is presented, which increases the error tolerances, thus efficiently increases stability of scale factor of fiber optic current transducer. Through theoretical analysis, the paper presents the theoretical model of λ/4 waveplate, and analyzes the accuracies of 0.2% and 0.01% of scale factor, which requires the tolerances of orientation error and retardation error. After peak -divide way applied to compensate, the results show that, compared with uncompensated system, for the accuracy of 0.2% and 0.01% of scale factor, the tolerances of orientation error and retardation error increase about 4.7 times and 11 times respectively. Thus, stability of scale factor also increases 4.7 times and 11 times respectively for the two different accuracies, and those also show that the higher accuracy, the more obvious compensation effect. Applied peak-divide way efficiently decreases the instability of scale factor which brings in measured error.

关 键 词：光纤电流互感器 λ/4波片 标度因数稳定性 峰值分割法 

分 类 号：TM452.94[电气工程—电器]