Standoff Raman Spectroscopic Detection of Explosive Molecules

E-mail: soocho@add.re.krReceived February 9, 2013, Accepted March 11, 2013We developed a standoff Raman detection system for explosive molecules (EMs). Our system was composedof reflective telescope with 310 mm diameter lens, 532 nm pulse laser, and Intensified Charge-Coupled Device(ICCD) camera. In order to remove huge background noise coming from ambient light, laser pulses withnanosecond time width were fired to target sample and ICCD was gated to open only during the time when thescattered Raman signal from the sample arrived at ICCD camera. We performed standoff experiments withmilitary EMs by putting the detector at 10, 20 and 30 m away from the source. The standoff results werecompared with the confocal Raman results. Based on our standoff experiments, we were able to observe thepeaks in the range of 1200 and 1600 cm