Aging Explosive Devices Research By Using THz Time-domain Spectroscopy

With the development of explosive technologyt,the demand and consumption of explosive has increased dramatically,and countries will store a large amount of explosive weapons in peacetime,so that they can defend the national security in the emergency war.How,ever,the explosive is a kind of energetic material which will be easily oxidized and relatively unstable.Its physical and chemical properties will change with the influence of temperature,humidity and corrosive gas during the long storage.This result will seriously affect the reliability and stability of explosive,so it is extremely important to research new detection technology of aging explosive.Terahertz time-domain spectroscopy has become a new spectral technology to detect material with its low energy and penetration.Because the rotation and vibration information of explosive molecules mainly located in terahertz band,we can obtain the terahertz time domain spectrum,frequency spectrum and absorption spectrum information of explosive with the Terahertz time-domain spectroscopy,and we can also distinguish the aging explosive.In this paper,I have studied the Terahertz Absorption Spectrum of explosive and aging explosive by using ’Terahertz time-domain spectroscopy,and analyzed the experiment results from the change of the molecular structure of the aging explosive.The main works of this paper are as follows:(1)Introduced the working principle of THz-TDS system(frequency range of 0.1THz to 2.5THz)and ZAP-ABCD system(frequency range of 0.5THz to 6THz),and detected the THz absorption of water vapor by using the two system.(2)Measured and calculated the Terahertz absorption spectrum of the five different explosive samples(PETN,RDX,HMX,LLM-105 and TATB).By using the transmission system,the experimental results show that there are multiple absorption peaks of explosive in the THz band,and the peaks position with the unique "fingerprint" is different from each other.The absorption peaks of explosive in the frequency range of 0.5THz to 6THz are to expand the existing research results.(3)Contrasted the THz absorption spectrum of without aging and aging explosive,and analyzed the changes with the aging mechanism of explosive in theory.The research results show that the absorption spectrum of explosive changed obviously after aging,because of the breaking or recombinant among the molecular groups.The research results show that the THz time-domain spectroscopy technique has important application value in the study of aging explosive.