1. Hubei Engineering Research Center of Weak Magnetic-Field Detection, College of Science, China Three Gorges University, Yichang, China
2. School of Physical Science and Technology, Lanzhou University, Lanzhou, China
3. National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan, China
4. College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China