1. Professor, Faculty of Infrastructure Engineering, Dalian Univ. of Technology, Dalian 116023, China.
2. Formerly, Postdoctoral Resident Fellow, Smart Sensors and NDT Laboratory, Dept. of Civil and Materials Engineering, Univ. of Illinois, Chicago, IL 60607.
3. Professor, School of Physics and Optoelectronic Engineering, Dalian Univ. of Technology, Dalian 116023, China.
4. Graduate Student, Smart Sensors and NDT Laboratory, Dept. of Civil and Materials Engineering, Univ. of Illinois, Chicago, IL 60607.
5. Professor, Smart Sensors and NDT Laboratory, Dept. of Civil and Materials Engineering, Univ. of Illinois, Chicago, IL 60607 (corresponding author).