[1] Zhou Y, Mu K J, Zhang Y D et al. Nondestructive testing of fuel tank foam with continuous wave terahertz[J]. Nondestructive Testing, 29, 266-267,271(2007).

[2] Li H T, Wang X K, Mu K J et al. Experimental studies on terahertz continuous wave related to security inspection[J]. Laser & Infrared, 37, 876-878(2007).

[3] Jepsen P U, Cooke D G, Koch M. Terahertz spectroscopy and imaging-modern techniques and applications[J]. Laser & Photonics Reviews, 5, 124-166(2011).

[4] Shen J L, Zhang C L. Terahertz nondestructive imaging technology and its application[J]. Nondestructive Testing, 27, 146-147(2005).

[5] Li Q, Ding S H, Yao R et al. Experiments on continuous-wave terahertz reflection-mode imaging for concealed objects[J]. Chinese Journal of Lasers, 39, 0811001(2012).

[6] Zhao B Q, Wei X L, Yang Z G et al. Terahertz nondestructive inspection of heat shield[J]. Laser Technology, 39, 185-189(2015).

[7] Yang Z G, Liu J S, Wang K J. Experimental research on nondestructive inspection for multilayer cellular samples using continuous terahertz waves imaging system[J]. Journal of Optoelectronics·laser, 24, 1158-1162(2013).

[8] Li W J, Wang T Y, Zhou Y et al. Terahertz non-destructive inspection of air defect within adhesive layers of multi-layer bonded structure[J]. Acta Optica Sinica, 37, 0111002(2017).

[9] Ji Z J, Zheng Q S, Liu Y et al. Experimental research on pulsed terahertz scanning imaging[J]. Journal of Hubei University of Education, 35, 15-19(2018).

[10] Qiao X L, Ren J J, Zhang D D et al. Terahertz spectrum multi characteristic parameters imaging method[J]. Journal of Changchun University of Science and Technology, 40, 25-31(2017).

[11] Sun J Z, Zhang L, Gao F et al. Quality improvement and noise reduction of terahertz continuous wave imaging[J]. Spectroscopy and Spectral Analysis, 37, 3343-3346(2017).

[12] Wu W B, Sun J Y, Wang X K. Summerize of terahertz (THz) imaging technology in dimension characterization[J]. Aeronautical Science and Technology, 26, 98-102(2015).