Detection of Nitroaromatic and Peroxide Explosives in Air Using Infrared Spectroscopy: QCL and FTIR

Table 1

Validation parameters for the various models constructed.

Parameter	Modulated FTIR (model 1)		Unmodulated FTIR (model 2)		QCL scan (model 3)
	TATP	DNT	TATP	DNT	TATP	DNT
Wilks’ lambda	0.12	0.03	0.09	0.11	0.05	0.06
Canonical correlation	0.94	0.98	0.96	0.94	0.98	0.97
PCCC	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%
PCCCC	100.00%	99.94%	100.00%	99.97%	100.00%	100.00%
Sensibility	100.00%	100.00%	100.00%	99.50%	100.00%	100.00%
Specificity	100.00%	99.75%	100.00%	100.00%	100.00%	100.00%
False alarm	0.00%	0.00%	0.00%	0.50%	0.00%	0.00%
Missed detection	0.00%	0.25%	0.00%	0.00%	0.00%	0.00%
Loadings	7	7	10	10	5	5
Samples (𝑁)	3079	3079	300	300	106	106
𝑃 value	<0.0001	<0.0001	<0.0001	<0.0001	<0.0001	<0.0001