Terahertz Frequency Continuous-Wave Spectroscopy and Imaging of Explosive Substances

Table 2

Lorentz fit algorithm peak values and FWHM values for each explosive compared to the spectral peaks obtained by determining the local maximum spectral peak values.

Explosive; compound	Local maximum spectral peaks (THz)	Lorentz function fit of spectral peaks (THz)	FWHM (THz)	Coefficient of determination (𝑅^2)
	0.83	0.84	0.13	0.98
	1.04	1.05	0.05	0.94
RDX		1.36	0.20	0.99
	1.51	1.52	0.29	0.99
		1.81	0.58	0.99
HMX	1.45	1.43	0.83	0.98
Icing sugar	1.40	1.44	0.67	0.99
PETN	1.78	1.78	0.80	0.99
	0.85	0.85	0.17
C-4	1.02	1.02	0.17	0.98
	1.37	1.38	0.38