测量光学玻璃电流传感头线性双折射的新方法

线性双折射是光学(含光纤)电流传感头的重要光学参量之一,会明显影响光学电流传感器的性能,因此测量光学传感头内线性双折射的大小对于提高光学电流传感器的性能有重要意义.本文报道了一种测量光学玻璃电流传感头线性双折射的新方法,以琼斯矩阵为数学工具给出了对该方法的理论分析及测量不确定度分析,并用实验方法给出了应用实例.此方法的主要优点是弥补了以前报道过的两种测量方法暴露出的无法唯一地确定光学玻璃电流传感头线性双折射的大小,或虽然能测定双折射大小,但测量不确定度较大的不足.实验结果表明:本方法可明显地提高测量准确度.

Novel Method to Measure the Linear Birefringence Inside Bulk Glass Current Sensing Heads

Linear birefringence is one of the most important parameters of optical (fiber-optic) current sensing heads,which can obviously affect the performance of the optical current sensors. Therefore,it is of great importance to measure the linear birefringence inside the optical current sensing head for the property enhancement of the optical current sensors. A novel method to measure the linear birefringence inside the bulk glass current sensing head is reported in this paper,which gives the theoretical analyses of the principle,the measurement uncertainty using the Jones Matrix as a mathematical tool,and an applied example. This method overcomes the shortcomings of the two methods reported before which can not uniquely determine the value of the linear birefringence or introduces large measurement uncertainty. The experimental result shows that this method can certainly enhance the measurement precision.