Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"explosive detection"”.
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Standoff Laser Interferometric Photoacoustic Spectroscopy for the Detection of Explosives
… always be a pressing need to detect and identify explosive materials. Performing detection at a standoff distance is much safer and this is the impetus for this work. Photoacoustic spectroscopy is well suited to the task of explosive detection at a standoff distance. A detailed theory of the …
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Indirect Detection of Explosive Vapours by Thermal Dissociation Cavity Ring-Down Spectroscopy
This thesis describes two explosive detection methods capable of detecting explosives indirectly in ambient air. The first of the explosive detection methods utilizes a platinum catalyst heated to 350 °C to catalyze the thermal dissociation of nitroaromatic explosives, such as 2,4,6 trinitrotolune …
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Towards terahertz dual-comb spectroscopy based on quantum cascade lasers
… THz QCL frequency combs and the multiheterodyne detection method, a prototype of the THz dual-comb spectrometer is demonstrated. This thesis work provides an important step towards realizing laser-based broadband THz spectroscopy system for chemical identification and explosive detection.
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Detection of explosive materials
Explosive materials are increasingly being exploited by criminal organisations,with harmful, devastating and destructive effects on targeted societies; highlighting the demand for sensitive, reliable and quick explosive detection methods that can be used in a range of environments. Immunoassays are …
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Automatic Detection of Elongated Objects in X-Ray Images of Luggage
… a prototype automatic luggage scanner for explosive detection, and it deals with the automatic detection of elongated objects (detonators) in x-ray images using matched filtering, the Hough transform, and information fusion techniques. A sophisticated algorithm has been developed for …
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Wire detection using ground penetrating radar using image processing techniques
This thesis investigates wire detection using various techniques applied to Ground Penetrating Radar (GPR) images. In this study, a step-frequency GPR with a co-pole configuration was used to collect data. The first approach proposes the use of Hough Transform (HT) to detect surface wires. The …
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Functionalization and fabrication of single-walled carbon nanotube-based chemiresistors for sensory applications
… it binds to cyclohexanone (a target analyte for explosive detection) via hydrogen bond, and it improves the overall robustness of SWCNT-based chemiresistors (e.g., humidity and heat). In our other studies, we fabricated sensors by drawing. Abrasion is a safe, simple, solvent-free, and low cost …
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Improving Sample Collection Of Trace Particles Of Mock Explosive On Nano Coated Sensor
In protection against explosive-based terrorism, development and mass deployment of miniature sensors can play a tremendous role. In trace explosive detection, one of the challenges is bringing explosive vapor samples from the environment to the sensor element. Such collection of a selective and …
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Intense laser matter interactions for explosives detection and tunable spectral blueshift
This dissertation investigates explosives detection and spectral shifts induced in metal surfaces by ultrafast laser pulses at intensities ranging from 1013 to 1014 W/cm2. These ~100 femtosecond (fs) pulses facilitate non-resonant vaporization of explosives, enabling non-contact sampling and …
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Improving Detection and Identification Methods for Volatile Organic Explosives
Although numerous chemical detection methods have been posited and tested for portability and detection of explosives, to date no method has solved the simultaneous issue of speed, reliability, selectivity and sensitivity. In order to advance the chemical and biological detection of explosives as …
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Energy transfer and localization in molecular crystals
… the aim of developing new technologies for the detection and defeat of energetic materials, this collection of work was focused on using simulations to characterize materials at extremes of temperature, pressure and radiation. Each branch of the work here is collected by which material response …
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Simulation of X-ray imaging systems for luggage inspection
… scanners, particularly those designed to detect explosives in luggage.
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The Utility of X-Ray Dual-Energy Transmission and Scatter Technologies for Illicit Material Detection
… is particularly important for detecting plastic explosives, where object shape information cannot be used. X-ray devices are relatively inexpensive compared to many other detection technologies. X-ray technology is considered as the technology for detecting illicit materials. Using x-ray …
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Ion Mobility Spectrometry : Optimization of Parameters in Collision Cross Sections and Trace Detection of Explosives
… interested topic in the research for substances detection in micro scale. No reliable analytical approach to calculate the collision cross section has been established to date. Different approaches rely on different mechanism will provide different results in significant extent. This work …
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Improving Object Classification in X-ray Luggage Inspection
X-ray detection methods have increasingly been used as an effective means for the automatic detection of explosives. While a number of devices are now commercially available, most of these technologies are not yet mature. The purpose of this research has been to investigate methods for using x-ray …
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Effects of Tomographic Image Reconstruction Parameters on Explosives Detection System Performance
Made available in DSpace on 2017-07-06T18:48:43Z (GMT). No. of bitstreams: 3 Humm_Paul_G_MS.pdf: 34070228 bytes, checksum: 084e7a2e24c30d8b43aa4516cb3ee7ab (MD5) Humm_Paul_G_MS_ABS.pdf: 527604 bytes, checksum: cbb92c87a7fda510847333f867d45322 (MD5) license.txt: 4813 bytes, checksum: …
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Novel XYZ scanner-based radiation and scattering measurement techniques for antena diagnostics and imaging applications
… fields such as security (personnel screening, explosive detection), non-invasive inspection and structure analysis (fatigue and crack analysis, hide objects profile reconstruction, through the wall imaging) medicine, civil engineering (Ground penetrating radar, GBSAR, SAR, etc.). Recent …