1. Chongqing Key Laboratory of modern photoelectric detection technology and instruments, Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection, Chongqing Engineering Research Center of Intelligent Optical Fiber Sensing Technology, Chongqing University of Technology, Chongqing 400054, China
2. Key Laboratory of Low-grade Energy Utilization Technologies and Systems and School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
3. School of Resources and Environment, University of Electronic Science and Technology, Chengdu 611731 Sichuan, China
4. School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China