1. Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing, School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, P. R. China
2. Fujian Forecam Optics Co, Ltd., Fuzhou, P. R. China
3. School of Transportation, Fujian University of Technology, Fuzhou, P. R. China
4. The State Key Laboratory of Fluid Power & Mechatronic Systems, Zhejiang University, Hangzhou, P. R. China