Arusi-Parpar T, Heflinger D, Lavi R
Non-Linear Optics Group, Electro-Optics Division, Soreq Nuclear Research Center, Yavne 81800, Israel.
Appl Opt. 2001 Dec 20;40(36):6677-81. doi: 10.1364/ao.40.006677.
A unique scheme has been applied for sensitive remote detection of 2,4,6-trinitrotoluene (TNT) vapor trace amounts at atmospheric pressure and 24 degrees C. The detection concept is based on a single laser beam inducing a tandem process: photodissociation of TNT vapor followed by highly selective detection of its photofragments vibrationally excited NO, utilizing laser-induced fluorescence with the A2Sigma+(v' = 0) <-- X2Pi(v'' = 2) transition. A detection sensitivity of at least 8 parts in 10(9) of TNT vapor with a signal-to-noise ratio of approximately 10 has been experimentally verified for an unfocused approximately 5-mJ laser beam, measured at a distance of approximately 15 cm from the TNT sample.
一种独特的方案已被应用于在大气压力和24摄氏度下对痕量2,4,6-三硝基甲苯（TNT）蒸汽进行灵敏的远程检测。该检测概念基于单束激光引发的串联过程：TNT蒸汽的光解离，随后利用A2Σ⁺(v' = 0) ← X2Π(v'' = 2)跃迁的激光诱导荧光对其光解离碎片振动激发的NO进行高选择性检测。对于一束未聚焦的约5 mJ激光束，在距离TNT样品约15 cm处测量，实验验证了TNT蒸汽的检测灵敏度至少为10⁹分之8，信噪比约为10。
