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Explosives terahertz spectroscopy

Author: MuKaiJun
Tutor: ZhangCunLin
School: Capital Normal University
Course: Optics
Keywords: Terahertz Dynamite Absorption peak Theoretical simulation Vibration
CLC: O431.1
Type: Master's thesis
Year: 2008
Downloads: 257
Quote: 3
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Abstract


Terahertz (THz, 1THz = 1012Hz) the band frequency from 0.1-10THz electromagnetic spectrum , between the millimeter wave and infrared imaging and spectroscopy can provide and not by the traditional microwave and X-ray . With the rapid development of ultrafast laser technology in recent years , to provide a stable THz pulse generation , the excitation source , and to promote the application and research of THz wave . THz time domain spectroscopy as a THz detection technology , compared to the Fourier transform infrared spectroscopy , it is not sensitive to the thermal background and high signal-to-noise ratio advantage . Among THz spectroscopy and imaging techniques has been widely applied. The first chapter introduces the research background , summarizes the existing security technology , cited progress at home and abroad to take advantage of THz science and technology research explosives , brief introduction to the purpose and significance of the THz generation and detection technology as well as the topics . Do a brief introduction to the second chapter of THz time-domain spectroscopy optical system , and a detailed explanation of the principle of THz absorption spectra parameters extracted . The third chapter is related explosives THz time-domain spectroscopy measurement results . This paper lists the the 4 monomers explosives and seven kinds of mixed explosives . The results showed that of TNPG, PETN, HMX, RDX explosives in at 0.2 ~ 2.5THz band there are obvious characteristic absorption peak . Among them , the results reported as PETN , HMX , RDX, and the absorption peak with similar literature consistent. The group mixed explosives RDX and HMX THz spectroscopy Further THz spectroscopy and their respective main body of explosive having a very similar spectra . It showed THz time-domain spectroscopy technology has potential applications in the identification of explosives and security field . Chapter theoretical analysis section of the of TNPG explosives and PETN explosives spectra . The brief THz spectral frequency calculation steps , the theoretical basis of quantum chemical calculations and the Gauss , DMol3 software . Given TNPG and PETN theoretical calculation results , and the comparison of their experimental results , the results show that the well of the experimental and theoretical found . In addition, we also discussed the method of calculation of the lattice vibration of the THz intensity PETN . Chapter V summarizes the experimental and theoretical simulation work , to discuss the prospects for THz science and technology in explosives detection and security applications .

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CLC: > Mathematical sciences and chemical > Physics > Optics > The light nature of the theory > Electromagnetic theory of light
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