Noninvasive Inspection of C-4 Explosive in Mails by Terahertz Time-Domain Spectroscopy
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概要
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We have measured the refractive index, extinction coefficient, and absorption coefficient of the explosive C-4 by THz time-domain spectroscopy and examined its applicability to detecting C-4 in mails. The explosive C-4, which is used in almost all mail-bomb terrorist activities, shows six THz bands in the frequency region from 5 to 90 cm-1 (150 GHz–2.7 THz). The 26.9 cm-1 band is very strong and can be used as a fingerprint of C-4. We confirmed that the THz absorption spectrum of C-4 hidden inside an envelope coincides essentially with that of C-4 itself. We also examined the applicability of the THz reflection spectroscopy to C-4 detection by calculating the reflectance spectra. Our results demonstrate that the THz techniques are very promising for counterterrorism against C-4 mail bombs.
- 2004-03-15
著者
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Koide Kenji
Forensic Science Laboratory Osaka Prefectural Police Headquarters
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MATSUSHITA Akira
Forensic Science Laboratory, Osaka Prefectural Police Headquarters
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Minami Yukio
Forensic Science Laboratory Osaka Prefectural Police Headquarters
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Tatsuno Michiaki
Forensic Science Laboratory Osaka Prefectural Police H.q.
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HANGYO Masanori
the Research Center for Superconducting Materials and Electronics, Osaka University
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Ikeda Takeshi
Forensic Science Laboratory Osaka Prefecture Police Headquarters
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Ikeda Takeshi
Forensic Science Laboratory, Osaka Prefectural Police Headquarters, Honmachi, Chuo-ku, Osaka 541-0053, Japan
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Yamamoto Kohji
The Research Center for Superconductor Photonics, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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Yamaguchi Mariko
The Research Center for Superconductor Photonics, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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Miyamaru Fumiaki
The Research Center for Superconductor Photonics, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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Tani Masahiko
The Research Center for Superconductor Photonics, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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Matsushita Akira
Forensic Science Laboratory, Osaka Prefectural Police Headquarters, Honmachi, Chuo-ku, Osaka 541-0053, Japan
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Tatsuno Michiaki
Forensic Science Laboratory, Osaka Prefectural Police Headquarters, Honmachi, Chuo-ku, Osaka 541-0053, Japan
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Koide Kenji
Forensic Science Laboratory, Osaka Prefectural Police Headquarters, Honmachi, Chuo-ku, Osaka 541-0053, Japan
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Hangyo Masanori
The Research Center for Superconductor Photonics, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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