1. Jiangxi Engineering Laboratory for Optoelectronics Testing Technology, Nanchang Hangkong University, Nanchang, Jiangxi 330063, P. R. China
2. National Engineering Laboratory for Non-Destructive Testing and Optoelectronic Sensing Technology and Applications, Key Laboratory of Nondestructive Testing Ministry of Education, School of the Testing and Photoelectric Engineering, Nanchang Hangkong University, Nanchang, Jiangxi 330063, P. R. China