1. School of Instrument Science and Opto-Electronics Engineering, Hefei University of Technology, Hefei, Anhui 230009, China
2. Anhui Institute of Quality and Standardization, Hefei, Anhui 230051, China
3. Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230026, China
4. School of Mechanical Engineering, Hefei University of Technology, Hefei, Anhui 230009, China