太赫兹技术在烟尘与风沙探测中的应用  

Application of THz technology for detection in soot and wind-blown sand

作　　者：陆益敏[1,2] 汪家春[1,2] 时家明[1,2] 林志丹[1,2] 

机构地区：[1]脉冲功率激光技术国家重点实验室,安徽合肥230037 [2]电子工程学院安徽省红外与低温等离子重点研究所,安徽合肥230037

出　　处：《红外与激光工程》2010年第3期487-490,共4页Infrared and Laser Engineering

基　　金：新世纪优秀人才支持计划(NCET-06-0935);安徽省重点实验室基金资助项目(2007A002002F)

摘　　要：提出了利用波长更长的太赫兹波进行低能见度条件下的探测。从理论上计算对比了石墨材料对1.06μm、3～5μm、8～12μm以及337μm波长或波段的消光性能(以质量消光系数(MEC)为例),发现石墨对337μm波长的质量消光系数比前三者的低1～3个数量级;进行了实验测量,获得了337μm太赫兹波对一定浓度条件下石墨(模拟烟尘)和尘土的透过率,并以此计算得到其质量消光系数,发现石墨对337μm波长的质量消光系数比对1.06μm、10.6μm波长的测量值低2个数量级。实验对比表明:337μm太赫兹波具有较强的穿透烟尘和风沙的能力,能够弥补传统红外探测系统的不足,对生活生产、安全检查以及反恐等方面均具有潜在的应用价值。The detection in low-visibility by THz wave, whose wavelength was longer than visible light and infrared,was bought forward. The properties of extinction （e.g. mass extinction coefficient, MEC） of black lead in the wavebands or wavelength of 1.06 μm, 3-5 μm, 8-12 μm, 10.6 μm and 337 μm, were calculated theoretically and compared. It shows that the mass extinction coefficient of black lead at 337 μm is smaller by 1-3 orders of magnitude than that of the former three wavebands. Experimental measurement demonstrates that the MEC of black lead （simulating soot） and dust at wavelength of 337 μm is smaller by 2 orders than the actual measurement value of 1.06 μm and 10.6 μm. It is indicated that the THz wave of wavelength 337 μm has stronger penetration capability through soot and wind-blown sand. Thus, THz wave can make up the lack of conventional IR detection system, and has many potential application in fields, such as daily life, industrial production, safety inspection,antiterrorism, and so on.

关 键 词：太赫兹探测 烟尘 风沙 质量消光系数 

分 类 号：TN911.4[电子电信—通信与信息系统]