gED – Network based explosive detection system - IJETAE

International Journal of Emerging Technology and Advanced Engineering Website: www.ijetae.com (ISSN 2250-2459, Volume 2, Issue 9, September 2012)

gED – Network based explosive detection system M.B. Muthukumaresan1, S. Jagadishkumar2 1

Capgemini India Private Limited, Chennai GNTS Technologies Private Limited, Chennai

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Abstract — In this detection system, it is focused to detect the explosive material approximately over a range of 500meters and above with an neutral network, which should be cost effective, low power consuming, harmless to the public and efficiently detect the explosives with standoff distance and to overcome the drawbacks of the existing traditional detecting systems and can be used in government buildings, airports and commercial buildings for security purposes. Our proposed detector consists of multiple ultrasonic transducers combined to form a node. Multiple number of nodes placed in all directions within the specified boundary allotted combined to form a neutral network to locate the hotspot by using the DASH7 technology.

This makes the system less efficient. But we cannot fully discard these traditional systems. We can use these systems as a secondary detection mechanism which needs more accurate decision. Hand held explosive detector. We can see this hand held metal detector in most of the police men’s. This is a compactable device with highest accuracy in explosive detection, but still requires manual operation for proper working. Our Proposed Wireless Explosive Detection System can be used as the Preliminary detection mechanism and for more accurate decisions we can use traditional systems. II. OBJECTIVES

Keywords — DASH technology, Explosive detection system, Network explosive detection, Ultrasonic transducers, Wireless explosive detection.

I.

a. Expanded operational area and capacity to detect explosives approximately over a range of 500meters and above with an neutral network, which should be cost effective, low power consuming, harmless to the public and efficiently detect the explosives with standoff distance and to overcome the drawbacks of the existing traditional detecting systems and can be used in government buildings, airports and commercial buildings for security purposes.. b. We used only commercially available sensors and also ultrasonic sensors are harmless to public. c. Using the DASH7 technology to interconnect with the other nodes. d. Real time monitoring without human help. e. Does not require any skilled person. f. Tracking of the target can be done in an easier and faster way because all the nodes are synchronized.

INTRODUCTION

The detection of explosive materials is a complex task that demands responsibility. Explosives are widely used in military science and practice, and also for civilian purposes. This requires the development and implementation of sensors and devices that can quickly generate precise and objective information on the type of explosive material. The development of such devices is difficult in view of the nature of the objects being classified –substances with high fire and explosion hazard. Moreover, the classification has to be conducted with sufficient speed and precision. Although there is sufficient technology to detect metal weapons, detection of plastic explosives, such as C-4, with methods that are harmless to humans still remains to be a challenge. Metal detectors or X-ray facilities commonly used at airports and custom houses cannot find plastic explosives. In the case of a metal detector door, we cannot determine the explosive unless and until explosive material pass through the door, Because of the short operational area.

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International Journal of Emerging Technology and Advanced Engineering Website: www.ijetae.com (ISSN 2250-2459, Volume 2, Issue 9, September 2012) III. ARCHITECTURE

IV. METHODOLOGY Our proposed detector system consists of multiple number of nodes which contains many number of ultrasonic transducers in all directions within the specified boundary allotted combined to form a neutral network and the nodes to locate the hotspot by using the DASH7 technology. A wireless sensor network consists of many number of nodes distributed in a random nature. The nodes have the ability to communicate with each other and can take decisions based on the sensor data. We are also focusing on the same technique here. Our system consists of several no of nodes depending upon the geographical area we are going to cover. Each node should be able to communicate with the other node and update the information if necessary. Tracking of the target can be done in an easier and faster way because all the nodes are synchronized. Our system consists of the DASH7 technology hence it is a power efficient explosive detection system. Most of the times nodes will be in the idle state, unless and until positive presence of an explosive is found. Which take less power or rather no power at all. This akes our system more power efficient. Each node consists of the microcontroller it gives the necessary information about the tracking data once explosive or related object is detected it send the information to the other nodes and all the nodes communicate and the shortest path is chosen by the other nodes and sends the information to the security server room by using the broadband network.

V. WORKING PLAN

1. Node : First in the node the ultrasonic transmitter will send the sound waves after the signal generated by the 40khz signal generator .When ultra-sonic waves fall on an explosive material some frequency changes occurs both in explosives & ultra-sonic waves and receiver receives the resultant signal from the many receivers and combined to form a multiplexed output then it amplifies the signal and then send to the frequency comparator .If the very low signal and very high signal can be filtered by the band pass filter and then The frequency comparator compares the frequency and the desired frequency alone send to the microcontroller and the microcontroller checks the attenuation changes in the resultant wave. With the help of the attenuation and frequency of the resultant wave the microcontroller defines the type of explosive material with already feed information about the explosive as already tested samples. The nodes are communicate with each other and send the information to the other nodes by the dash7 technology and the all other nodes starts track the target with the shortest path taken by them.

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International Journal of Emerging Technology and Advanced Engineering Website: www.ijetae.com (ISSN 2250-2459, Volume 2, Issue 9, September 2012) Block diagram

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2. Dash7 technology Dash7 technology is used to interconnect the nodes and form a neutral network. Dash7 operates at around 433 megahertz, a globally available frequency also used, for example, in many keyless entry systems for automobiles. The corresponding wavelength is about 70 centimeters, which makes it difficult to design efficient antennas that are conveniently compact. Dash7 supporters say that the advantage of using a wavelength this long is that it can penetrate such obstacles as concrete walls and work in environments with large amounts of metallic clutter. DASH7 is the most advanced sensor network platform on the market. As with all mainstream computing platforms (PCs, Smartphone’s), security and privacy are critical elements for mass adoption. The DASH7 Security Working Group has authored this first-in a-series paper to energize the community on this topic with the ultimate goal of ensuring DASH7 technology is the most secure, private and efficient sensor network platform on the planet. Features     

Real-Time Locating Precision: within 4 meters Latency: Configurable, but worst case is less than two seconds  P2P Messaging: Yes  IPv6 Support: Yes  Security: 128-bit AES, public key  Standard: ISO/IEC 18000-7 3. Server room The security server room receives the real time data s of the node. The dash7 passes the resultant signal to the server room by means of the wireless network controller through the broadband connection attached to it. If any node traces the explosives then the location of the node can be displayed in the server room. With the node allotted ip the target trace can be easy. And with the help of the graph plotted the type of the explosive also be determined. VI. CONCLUSION In this work we have proposed an efficient autonomous system for standoff explosive detection. While comparing with traditional systems our gED have lot of advantages. The main advantages are its miniature size, Network based detection, low power consumption, distributed operation, and easy implementation. gED is organized in such a manner that only security officials know about the presence of the system. By using our proposed system we can detect the explosive materials in car, bus, government buildings, railway stations & airports.

Range: Dynamically adjustable from 10 meters to 10 kilometers Power: