Research On Orthoconjugate Reflector Current Sensor

Optical Current Sensor, OCS for short, is the kind of equipment measuring current directly or indirectly by utilizing optical technology. And the research on it has good achievement in recent years.One of the predominant hinders for the practical applications of bulk glass optical current transformers is the harmful influences of the reflection-induced retardance and linear birefringence existing inside the glass current sensing elements. Up till now, there are not suitable solutions, which can be practically used. To solve this problem, a new design of optical current sensor without bulk glass current sensing head, using a Faraday Mirror directly as the primary current sensing element, is proposed, the theoretical analysis of the working principle, the simulation results of the polarization state of the output light are presented, the optical setup is shown, the mathematical expression of the working principle is derived, the experimental result is given. A linear system is proved by experiments. It is also shown that our new design is reasonable and feasible. The advantages and shortcomings of the design are discussed in this paper. The results reported here might be a reference on the performance improvement of the present bulk glass OCT and the development of practically applicable optical current transformers.