1College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, Shanxi 0 30024, China
2Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education, Taiyuan University of Technology, Taiyuan, Shanxi 0 30024, China
3Xinzhou Teachers University, Xinzhou, Shanxi 0 34000, China