[1] Hu B B, Nuss M C. Imaging with terahertz waves[J]. Optics Letters, 20, 1716(1995).
[2] Ferguson B, Zhang X C. Materials for terahertz science and technology[J]. Nature Materials, 1, 26-33(2002).
[3] Federici J F, Schulkin B, Huang F et al. THz imaging and sensing for security applications: explosives, weapons and drugs[J]. Semiconductor Science and Technology, 20, S266-S280(2005).
[4] Zhang Z W, Zhao Y J, Miao Y X et al. Terahertz nondestructive testing imaging technology based on linear frequency modulation mechanism[J]. Acta Optica Sinica, 42, 0411002(2022).
[5] Xie W, Hou L W, Pan M. 2-D scanning technology in passive terahertz imaging[J]. Journal of Terahertz Science and Electronic Information Technology, 12, 176-179(2014).
[6] Na H Y, Zhou D L, Jiang S L et al. An improved active terahertz imaging system[J]. Journal of Nanjing University (Natural Sciences), 52, 787-794(2016).
[7] Zhou D L, Hou L W, Xie W et al. Practical dual-band terahertz imaging system[J]. Applied Optics, 56, 3148-3154(2017).
[8] Wang H, Zhou D L, Su R F et al. Effects of diffuse and specular reflections on detecting embedded defects of foams with a bifocal active imaging system at 0.22 THz[J]. IEEE Transactions on Terahertz Science and Technology, 11, 150-158(2021).
[9] Wang H W[M]. Partial least-squares regression-method and applications, 45-46(1999).
[10] Lu Z G, He P, Zhi L J et al. Laser triangulation measurement model based on least square polynomial fitting method[J]. Journal of Applied Optics, 40, 853-858(2019).
[11] Shang D, Sun L X, Qi L F et al. Quantitative analysis of laser-induced breakdown spectroscopy iron ore slurry based on cyclic variable filtering and nonlinear partial least squares[J]. Chinese Journal of Lasers, 48, 2111001(2021).