Broadband terahertz time-domain spectroscopy of drugs-of-abuse and the use of principal component analysis
Literature Information
Andrew D. Burnett, Wenhui Fan, Prashanth C. Upadhya, John E. Cunningham, Michael D. Hargreaves, Tasnim Munshi, Howell G. M. Edwards, Edmund H. Linfield, A. Giles Davies
Terahertz frequency time-domain spectroscopy has been used to analyse a wide range of samples containing cocaine hydrochloride, heroin and ecstasy – common drugs-of-abuse. We investigated real-world samples seized by law enforcement agencies, together with pure drugs-of-abuse, and pure drugs-of-abuse systematically adulterated in the laboratory to emulate real-world samples. In order to investigate the feasibility of automatic spectral recognition of such illicit materials by terahertz spectroscopy, principal component analysis was employed to cluster spectra of similar compounds.
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