Abstract
We separated the component spatial patterns of frequency-dependent absorption in chemicals and frequency-independent components such as plastic, paper, and measurement noise in terahertz (THz) spectroscopic images, using known spectral curves. Our measurement system, which uses a widely tunable coherent THz-wave parametric oscillator source, can image at a specific frequency in the range 1–2 THz. The component patterns of chemicals can easily be extracted by use of the frequency-independent components. This method could be successfully used for nondestructive inspection for the detection of illegal drugs and devices of bioterrorism concealed, e.g., inside mail and packages.
© 2003 Optical Society of America
Full Article | PDF ArticleMore Like This
Kodo Kawase, Yuichi Ogawa, Yuuki Watanabe, and Hiroyuki Inoue
Opt. Express 11(20) 2549-2554 (2003)
Masatsugu Yamashita, Mamoru Usami, Kazushiro Fukushima, Ryoichi Fukasawa, Chiko Otani, and Kodo Kawase
Appl. Opt. 44(25) 5198-5201 (2005)
S. Kawata, K. Sasaki, and S. Minami
J. Opt. Soc. Am. A 4(11) 2101-2106 (1987)