Open AccessArticle by Yong Wang 1, Ningning Lu 2, Hucheng Sun 1,* and Rui Ren 3 1 Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology, Nanjing 210044, China 2 Beijing R&D Center, The 54th Research Institute, China Electronics Technology Group Corporation, Beijing 100041, China 3 College of Science, Hohai University, Nanjing 210044, China * Author to whom correspondence should be addressed.