1. Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education, Beijing, China
2. Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education, Taiyuan University of Technology, Taiyuan, China
3. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, China
4. Accelink Technologies Company Ltd., Wuhan, China