International Journal of Computer Applications (0975 – 8887) Volume 130 – No.10, November2015 16 Hidden Explosive Detection Systems for Vehicle Yashwant Kurmi Department of ECE, Maulana Azad National Institute of Technology Bhopal, India Vijayshri Chaurasia Department of ECE, Maulana Azad National Institute of Technology Bhopal, India ABSTRACT The hidden explosive material detection is a non-destructive investigation practice to identify explosive substances. It is widely deployed at airports, harbours, and sensitive areas of country specially the border areas. The basic detection arrangements are improving at their own pace but unauthorized movement of arms and illegal imports still happens. It is very common through vehicles by making false voids in their fuel tank or inside door panels. The hidden voids detection is a difficult task inside the compartments of vehicle. It is also unreliable, time consuming, and expensive. In conventional detection systems, canines and x-rays are the most common methods. Many advancements in the mentioned field have been proposed. This paper gives a comparative analysis of most significant explosive detection systems for identifying vehicle voids and compartments that may have explosives or illegal imports.. Keywords Laser Vibrometer, Hide Explosive Detection, Tetra Hertz Detection system, Spectrum based IED. 1. INTRODUCTION In present era, anti-social elements are using explosive materials for mass destruction. Control of such activities is very big issue for authorities. To stop the misuse of the explosive it is extremely essential to intensely inspect the corporeal belongings. Fig.1 A U.S. Customs and Border Protection officer with an explosive-detection dog [5] The investigation must be done to scrutinize and define the procedural experiment in identifying the Improvised Explosive Devices (IEDs). The most movable equipments of detection have been intended for security at airport and are attentive on finding recent plastic made explosives that create the significant destruction, even in trivial quantities. The most the present explosive ingredient mainly comprises of solid, nitrogenous compounds. As enumerated in table 1. A conventional method of an explosive detection with the help of canine is as shown in fig. 1. This system is very expensive and not an automated. To make it automatic the researchers are working the different possible options. The accessibility and reliability of canine procedure is limited. The detection process through employment of x-rays is reliable but it is expensive and not easily available. Moreover, these systems do not permit the user to augment or reduce search efforts according to threat levels for keeping the balance between thorough search capabilities and lengthy examine times. Table 1. Common Explosive Material NAME CHEMACAL NAME RDX Cyclotrimethylenetrinitramine TNT Trinitrotoluene PETN Pentaerythritol Tetranitrate ANAL Ammonium Nitrate and Aluminum Powder Dynamite Mixture of nitroglycerine and nitrocellulose ANFO Ammonium Nitrate and Fuel Oil Black Powder Gun powder or grain powder HMX Hexamethylene Triperoxide Diamine TATP Triacetone Triperoxide C4 90% RDX+ Plasticizer There exist numeral Hide Explosive recognition schemes based on vapor and trace adulteration. Krausa [13] said in his research that the materials that are volatile in nature with high vapor pressure are easily detectable [13]. But most of the current explosive composite exhibits very low pressure of vapor which makes vapor-based finding difficult. The materials of low pressure and high explosive capacity are considered the greatest threat to aviation security. However, there are a number of other materials that are used in IEDs. Cottrell has introduced the Contra band Detection System based on laser vibrometer [3]. That is more efficient for vehicle void detection with high range. Various explosive detectors technologies are used in present time. Some significant of them are considered here for this study. In rest of the paper, the section II represents Ion Mobility Spectrometry system. The part III covers the pulsed Tetra Hertz (THz) detection method, section IV give the description of Acoustic Wave’s Explosive Detection, and sector V covers the Laser Vibrometer for explosive detection. Finally section VI concludes the paper. 2. ION MOBILITY SPECTROMETRY The Explosive substance recognition through Ion Mobility Spectrometry (IMS) is based on the ion velocities in an