Evaluation Of One Sided Nuclear Magnetic Resonance For Remote Detection Of Explosives PDF Download
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Author | : L. J. Burnett |
Publisher | : |
Total Pages | : 111 |
Release | : 1987 |
Genre | : |
ISBN | : |
Download Evaluation of One-Sided Nuclear Magnetic Resonance for Remote Detection of Explosives Book in PDF, ePub and Kindle
This study defines the problem of nuclear magnetic resonance (NMR) remote detection of explosives gathers available data on the materials of interest, defines a figure of merit suitable for comparing alternative instrument configuration, and uses the figure-of-merit to identify one or more remote detection NMR systems with the potential is contribute to the solution of the decision problem. Keywords: Nuclear magnetic resonance, Explosive detection.
Author | : Tomaž Apih |
Publisher | : Springer |
Total Pages | : 168 |
Release | : 2013-10-02 |
Genre | : Technology & Engineering |
ISBN | : 9400772653 |
Download Magnetic Resonance Detection of Explosives and Illicit Materials Book in PDF, ePub and Kindle
Detection of concealed explosives is a notoriously difficult problem, and many different approaches have been proposed to solve this problem. Nuclear quadrupole resonance (NQR) is unique in many ways. It operates in a safe AM radio frequency range, and it can remotely detect unique “fingerprint” (NQR spectrum) of many explosives, such as TNT or RDX. As such, the detection of target does not depend on the shape or material of the container, or the presence of metallic object such as triggers etc. Spectra of chemically similar compounds differ enough that their presence never causes interference or false alarms. Unfortunately, widespread use is prevented due to low sensitivity, radiofrequency interference from the noisy environment, and inability to detect liquid explosives. This book presents current state of the art of the attempts to overcome NQR sensitivity problem, either by increasing the strengths of signals generated, or by increasing the specificity of the technique through a better understanding of the factors that affect the quadrupolar parameters of specific explosives. The use of these specific quadrupolar parameters is demonstrated on signal processing techniques that can detect weak signals, which are hidden in a noisy background. The problem of differentiation of liquid explosives and benign liquids in closed containers is approached by measurements of different nuclear magnetic resonance (NMR) parameters. As shown, a couple of solutions has reached a prototype stage and could find their use in a near future.
Author | : Jacques Fraissard |
Publisher | : Springer Science & Business Media |
Total Pages | : 292 |
Release | : 2009-07-06 |
Genre | : Technology & Engineering |
ISBN | : 904813062X |
Download Explosives Detection using Magnetic and Nuclear Resonance Techniques Book in PDF, ePub and Kindle
Nuclear quadrupole resonance (NQR) a highly promising new technique for bulk explosives detection: relatively inexpensive, more compact than NMR, but with considerable selectivity. Since the NQR frequency is insensitive to long-range variations in composition, mixing explosives with other materials, such as the plasticizers in plastic explosives, makes no difference. The NQR signal strength varies linearly with the amount of explosive, and is independent of its distribution within the volume monitored. NQR spots explosive types in configurations missed by the X-ray imaging method. But if NQR is so good, why it is not used everywhere? Its main limitation is the low signal-to-noise ratio, particularly with the radio-frequency interference that exists in a field environment, NQR polarization being much weaker than that from an external magnetic field. The distinctive signatures are there, but are difficult to extract from the noise. In addition, the high selectivity is partly a disadvantage, as it is hard to build a multichannel system necessary to cover a wide range of target substances. Moreover, substances fully screened by metallic enclosures, etc. are difficult to detect. A workshop was held at St Petersburg in July 2008 in an attempt to solve these problems and make NQR the universal technique for the detection of bombs regardless of type. This book presents the essentials of the papers given there.
Author | : |
Publisher | : |
Total Pages | : 728 |
Release | : 1994 |
Genre | : Aeronautics |
ISBN | : |
Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 588 |
Release | : 1987-11 |
Genre | : Science |
ISBN | : |
Download Technical Reports Awareness Circular : TRAC. Book in PDF, ePub and Kindle
Author | : Steve Loud |
Publisher | : Taylor & Francis |
Total Pages | : 2381 |
Release | : 2000 |
Genre | : Technology & Engineering |
ISBN | : 0938994867 |
Download Bridging the Centuries with SAMPE's Materials and Processes Technology Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 1010 |
Release | : 1988 |
Genre | : Research |
ISBN | : |
Download Government Reports Annual Index Book in PDF, ePub and Kindle
Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Author | : |
Publisher | : |
Total Pages | : 1016 |
Release | : 1988 |
Genre | : Government reports announcements & index |
ISBN | : |
Download Government Reports Annual Index: Keyword A-L Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 622 |
Release | : 1988 |
Genre | : Science |
ISBN | : |
Download Government Reports Announcements & Index Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 1010 |
Release | : 1992 |
Genre | : Aeronautics |
ISBN | : |
Download Proceedings of the First International Symposium on Explosive Detection Technology, November 13-15, 1991 Book in PDF, ePub and Kindle