In recent years, as a whole the international situation is stable, whereas local war still going on. Since the terrible incident taking place in America on September 11, 2001, necessary measures have been taken in various countries, in order to cope with the terrorism. Bag gages should be checked in the frontier inspection station and the airport, so as to make sure whether there are explosives or not. Anyway, explosives are dangerous and their usage ought to be restricted. Therefore, the job of detecting explosives is important and necessary during the security inspection [1]. The terrorist attacks around the world have brought a new focus onto the identification and quantization of explosive residues in crime scene investigation and homeland security.Recently, Explosive-based terrorism has grown enormously, because explosive-based weapons are deploy, and can cause enormous damage [2]. Attack on commercial aviation was regarded as unthinkable until the 1960s. One of the front liness of homeland security, airport departure gates, uses sophisticated screening devices such as Ion mobility spectrometers that have become prominent trace detectors of explosives and can be seen in airports worldwide at security check points where hand bags, and other small articles, to be carried onboard aircraft are screened for explosives[3]. Surfaces of such articles are wiped using a cloth strip to collect residues or particulates of explosives For the detection of traces of explosive substances in the air, issues related to the low vapor pressures of many explosives are only exacerbated further when these explosives are wrapped or packaged to avoid detection[4].We have within this reviewdifferent technique for achieving security inspection and illicit substance screening additional.We discussed many of the applications that require explosive detection and the capabilities of some of the current commercial systems.

Keywords