1. School of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin, China
2. Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems, Tianjin Polytechnic University, Tianjin, China
3. School of Environmental Science and Engineering, Tianjin Polytechnic University, Tianjin, China
4. School of Electrical Engineering and Automation, Tianjin Polytechnic University, Tianjin, China