Nine wave-length THz spectrum for identification using backward wave oscillator

Mo Lv; Hua Zhong; Xin-hao Ge; Ting He; Kaijun Mu; Cun-lin Zhang

doi:10.1117/12.837753

18 November 2009 Nine wave-length THz spectrum for identification using backward wave oscillator

Mo Lv, Hua Zhong, Xin-hao Ge, Ting He, Kaijun Mu, Cun-lin Zhang

Proceedings Volume 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security; 75120J (2009) https://doi.org/10.1117/12.837753
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

The sensing of the explosive is very important for homeland security and defense. We present a nine-wavelength continuous wave (CW) Terahertz (THz) spectroscopy for identification of explosive compounds (2,4-DNT, RDX and TNT) using three Backward Wave Oscillator (BWO) sources, which emit radiations from 0.2 THz to 0.38THz, 0.18THz to 0.26THz and 0.6THz to 0.7THz, respectively. To identify the target materials, only the transmitted THz power through the explosive pellets are measured at the nine discrete wavelengths. A hole, which is the same size as these pellets, is used as references to normalize the transmitted THz power. The measured discrete spectra was successfully identified and classified by using self-organizing map (SOM). These results prove that the backward wave oscillator is a convenient and powerful solution in future development of a standoff THz sensing and identification unit.

Citation Download Citation

Mo Lv, Hua Zhong, Xin-hao Ge, Ting He, Kaijun Mu, and Cun-lin Zhang "Nine wave-length THz spectrum for identification using backward wave oscillator", Proc. SPIE 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security, 75120J (18 November 2009); https://doi.org/10.1117/12.837753

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