1. School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, People’s Republic of China
2. Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, School of Instrument Science and Opto-Electronics Engineering, Hefei University of Technology, Hefei, People’s Republic of China
3. Academy of Opto-Electric Technology, Hefei University of Technology, Hefei, People’s Republic of China