Theoretical Prediction Of The Effect Of Linear Birefringence Temperature Features Upon The Performance Of An Optic-glass Current

The temperature characteristics of linear birefringence and its effect upon the output of an optic-glass current sensor is theoretically analyzed and simulated with a computer. The outcomes show that the system sensitivity can be changed by one percent when the ambient temperature varies in the range from negative 40 degrees to positive 40 degrees. When temperature field distributes evenly, and the temperature characteristics of residual stress are ignored, then the linear birefringence induced by mutual pressure between sensing head and surrounding material is the main factor, which affects the system sensitivity. When fabricating the sensing head, rational sealing method and appropriate buffer material should be used to reduce the linear birefringence inside the current sensing head to improve temperature stabilization of the measuring system. These research results might provide a useful reference for those studying the temperature characteristics of optic-glass current sensor.