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Author :
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (653 download)
Download or read book Beheers de groei written by and published by . This book was released on 1973 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : ShiXi Joe Qiu
Publisher :
ISBN 13 :
Total Pages : 175 pages
Book Rating : 4.:/5 (42 download)
Download or read book Acoustic Land Mine Detection written by ShiXi Joe Qiu and published by . This book was released on 1999 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jacqueline MacDonald Gibson
Publisher : Rand Corporation
ISBN 13 : 9780833033017
Total Pages : 336 pages
Book Rating : 4.0/5 (33 download)
Download or read book Alternatives for Landmine Detection written by Jacqueline MacDonald Gibson and published by Rand Corporation. This book was released on 2003 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: At the rate that government and nongovernmental organizations are clearing existing landmines, it will take 450-500 years to rid the world of them. Concerned about the slow pace of demining, the Office of Science and Technology asked RAND to assess potential innovative technologies being explored and to project what funding would be required to foster the development of the more promising ones. The authors of this report suggest that the federal government undertake a research and development effort to develop a multisensor mine detection system over the next five to eight years.
Author : Ghaith Mashhour Matalkah
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.:/5 (213 download)
Download or read book Apparatus and Algorithms for Acoustic Landmine Detection written by Ghaith Mashhour Matalkah and published by . This book was released on 2007 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John Houston Doherty
Publisher :
ISBN 13 :
Total Pages : 120 pages
Book Rating : 4.:/5 (264 download)
Download or read book Landmine Detection with a Standoff Acoustic/laser Technique written by John Houston Doherty and published by . This book was released on 2008 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Landmines and mine-like traps are effective weapons that are difficult to detect and discriminate from a safe distance. The ability to detect landmines in their host environment at a distance and to discriminate them from other objects would be valuable for countering the landmine threat. This paper explores a standoff acoustic/laser technique to discriminate landmines from other forms of man-made objects (clutter) in an urban environment. A novel approach currently under investigation by MIT Lincoln Labs, University of Mississippi, and other groups employs a non-contact acoustic/laser technique to detect landmines from a safe standoff range. This technique uses a sound source to excite vibrations in targets with an acoustic wave. These vibrations are in turn measured remotely with a Laser Doppler Vibrometer (LDV). In this thesis, the vibration responses of landmine variants are measured, analyzed, and compared to those of common urban objects likely to be found on a landmine field or roadside. The Fourier Transform of the vibration of the target as measured by the LDV is used to generate a target vibration spectrum. Target vibration spectra in response to a sound source were experimentally measured for 59 trials, 28 of which were of simulated landmine variants and the remaining trials were of urban clutter objects. Using an algorithm adapted from a methodology for mass spectral analysis, parameters of the target signatures are estimated; then individual target signatures are classified using a Support Vector Machine (SVM) with a training set composed of parameters from the remaining members of the total population. The best results obtained from this methodology had a 71% probability of detection and a 3% false alarm rate corresponding to 20 of 28 of the simulated landmine variants correctly identified and a single clutter object misidentified as a landmine variant.
Author : United States. General Accounting Office
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.F/5 ( download)
Download or read book Land Mine Detection written by United States. General Accounting Office and published by . This book was released on 2001 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 29 pages
Book Rating : 4.:/5 (318 download)
Download or read book False Indicators to Acoustic-To-Seismic Buried Landmine Detection written by and published by . This book was released on 2007 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proliferation of relatively cheap landmines in many of the world's conflicts has led to a critical situation. Most methods of locating landmines trigger on too many false alarms must each be investigated before declaring an area to be clear of mines. This led to the need for an accurate means of detection coupled with a low false alarm rate. The University of Mississippi has developed an acoustic/seismic technique to meet this need. In 2002, the Office of Naval Research issued Grant N00014-02-1-0878 to conduct research to better understand the causes of false alarms using this method and to develop methods to significantly reduce them. This report discusses the significant research advances including a clearer understanding of the phenomenology underlying the technology, development of models, and signal processing techniques to reduce false alarms.
Author :
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (318 download)
Download or read book Nonlinear Acoustic Techniques for Land Mine Detection written by and published by . This book was released on 2002 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: When airborne sound couples into the ground seismic waves can interact with a target buried in the soil and effect the vibration velocity of the surface. Acoustic-to-seismic coupling (using linear acoustic techniques) has proven to be an extremely accurate technology for locating buried land mines [J.M. Sabatier and N. Xiang, IEEE Trans. Geoscience and Remote Sensing 39, 1146-1154 (2001)] . Donskoy [SPIE Proceedings 3392, 211-217 (1998); 3710, 239-246 (1999)] has suggested a nonlinear technique that can detect an acoustically compliant buried mine that is insensitive to relatively noncompliant targets. (Utilizing both techniques could eliminate certain types of false alarms.) Airborne sound at two primary frequencies f1 and f2 undergo acoustic-to-seismic coupling and a superimposed seismic wave interacts with the compliant mine and soil to generate a difference frequency component that can effect the vibration velocity at the surface. Geophone measurements scanning the soil's surface at the difference frequency (chosen at a resonance) profile the mine with more relative sensitivity than the linear profiles - but off the mine some nonlinearity exists. Amplitude dependent frequency response curves for a harmonically driven mass-soil oscillator are used to find the nonlinearity of the soil acting as a "soft" spring. Donskoy's nonlinear mechanism (over the mine) involves a simple model of the top surface of the mine-soil planar surface separating two elastic surfaces. During the compression phase of the wave, the surfaces stay together and then separate under the tensile phase due to a relatively high compliance of the mine. This "bouncing" soil-mine interface is thought to be a bi-modular oscillator that is inherently nonlinear.
Author :
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (318 download)
Download or read book Advances in Acoustic Landmine Detection written by and published by . This book was released on 2006 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The phenomenon of the acoustic-to-seismic (A/S) coupling of airborne sound into the ground for buried anti-personnel and anti-tank landmine detection is well established [J.M. Sabatier and N. Xiang, IEEE Trans. on Geoscience & Remote Sensing, 39, pp 1146-1154 (2001); N. Xiang and J.M. Sabatier, J. Acoust. Soc. Am, 113, pp. 1333-1341 (2003)]. A sound source is used to insonify the ground surface. The airborne sound couples into the soil and excites the vibrational energy of the soil matrix. An anomaly in the vibrational energy occurs on the ground surface in a region very near a buried landmine. This anomaly can be detected with a vibration sensor. This paper will discuss vibration sensors that are currently being used to measure the vibrations due to the presence of a buried landmine. These instruments include a geophone, laser, ultrasonic and radar Doppler vibrometers, and a whole field optical sensor. The detection ability of fused sensors comprised of the A/S laser Doppler vibrometer based sensor and a ground penetrating synthetic aperture radar is also being investigated. Researchers at the University of Mississippi, Planning Systems Incorporated, and MetroLaser, Inc. are investigating all of the vibration sensors described above. This paper will present results of this research.
Author : Michelle Beatrice Mattingly
Publisher :
ISBN 13 :
Total Pages : 202 pages
Book Rating : 4.:/5 (747 download)
Download or read book A Mathematical Model for the Acoustic and Seismic Properties of the Landmine Detection Problem written by Michelle Beatrice Mattingly and published by . This book was released on 2008 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (946 download)
Download or read book Enhanced Equipment for Acoustic Detection of Buried Landmines written by and published by . This book was released on 2001 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using funds provided by the Office of Naval Research, the University of Mississippi purchased three new laser Doppler vibrometers (LDVs) and upgraded an existing LDV for use in acoustic landmine detection research.
Author :
Publisher :
ISBN 13 :
Total Pages : 760 pages
Book Rating : 4.3/5 (91 download)
Download or read book Detection and Remediation Technologies for Mines and Minelike Targets written by and published by . This book was released on 1999 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sean Andrew Genis
Publisher :
ISBN 13 :
Total Pages : 120 pages
Book Rating : 4.:/5 (271 download)
Download or read book Nonlinear Acoustic Landmine Detection written by Sean Andrew Genis and published by . This book was released on 2007 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic-to-seismic (A/S) coupling involving airborne sound is used to generate soil vibrations that interact with the top plate of a buried landmine. Due to scattering, the interaction at the soil-mine interface produces an enhanced and strongly nonlinear soil surface vibration directly over the buried landmine. Resonant tuning curves of the soil-mine system show that the nonlinear behavior observed near resonance for "on the mine" locations is considerably stronger that that seen "off the mine." This suggests that some false alarms due to the resonant effects of the ground's natural layering may be eliminated by comparing the frequency softening in resonant tuning curves between "off" and "on target" locations. Experiments with the soil-mass oscillator (SMO) apparatus show that the nonlinear acoustic landmine detection problem involves mesoscopic nanoscale nonlinear elastic behavior. Resonant tuning curves have linear backbones, a behavior also characteristic of certain geomaterials (sandstone). Elasto-slip (Iwan 1966) and LISA (Scalerandi et al 2002) models of hysteresis are used to explain this phenomenon. The soil-mine interface, which is modeled using a soil-plate oscillator (SPO) apparatus, is extremely nonlinear. The SPO is excited using both acoustic and electromagnetic means. A/S coupling experiments are employed to simultaneously measure vibrations at the underside of a buried clamped plate and the soil surface. Electrodynamic experiments determine the motional impedance of a combined soil-plate system. At large drive amplitudes, the backbone curves obtained from the SPO exhibit more complicated behavior, which is described using a bilinear hysteresis model (Caughey 1966). Nonlinear acoustic landmine detection experiments are performed in the anechoic chamber facility using both a buried acrylic drum-like mine simulant and a VS 1.6 plastic anti-tank landmine. Using an automated laser Doppler vibrometer, soil surface vibraions are profiled as a function of scan position. Elements of both the elasto-slip and bilinear hysteresis models appear in these experiments.
Author :
Publisher : DIANE Publishing
ISBN 13 : 1428948406
Total Pages : 44 pages
Book Rating : 4.4/5 (289 download)
Download or read book Land mine detection DOD's research program needs a comprehensive evaluation strategy : report to the Chairman, Subcommittee on Military Research and Development, Committee on Armed Services, House of Representatives written by and published by DIANE Publishing. This book was released on with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Allen M. Morita
Publisher :
ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.:/5 (227 download)
Download or read book Land Mine Detection System written by Allen M. Morita and published by . This book was released on 1973 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this contract was to determine the feasibility of using acoustic waves for the detection of metallic and nonmetallic land mines. It was found that a 3 KHz pulse burst could detect all of the simulated mines at burial depths exceeding 12 inches. The mine reflected signals exhibited a signature significantly different from those obtained with no mine present and with small soil inhomogeneities present. Rock reflected signals generally exhibited irregular axes of reflection. Mine reflected acoustic signals can be detected and imaged from both nonmetallic and metallic mines at the burial depths most likely occurring in a field situation. (Author).
Author :
Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.:/5 (15 download)
Download or read book Landmine Detection Using Laser Vibrometry written by and published by . This book was released on 2006 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic Landmine Detection (ALD) using a laser vibrometry was studied using two acoustic ground excitation methods: acoustic (loudspeaker) excitation (AE) and laser excitation (LE). AE is suitable for detecting buried landmines but is a slow technique. A faster AE method based on a CMOS camera was proposed but not studied further. LE is potentially a faster technique but suffers from surface effects. An important surface effect is the relaxation of the surface after the disturbance by the laser excitation pulse. This relaxation lasts for more than 4 ms in the vicinity of the laser-excitation spot. Due to these surface effects, LE does not seem to be a viable technique in combination with laser vibrometry.
Author : Barrett Hazeltine
Publisher : Elsevier
ISBN 13 : 0080469809
Total Pages : 889 pages
Book Rating : 4.0/5 (84 download)
Download or read book Field Guide to Appropriate Technology written by Barrett Hazeltine and published by Elsevier. This book was released on 2003-04-09 with total page 889 pages. Available in PDF, EPUB and Kindle. Book excerpt: Field Guide to Appropriate Technology is an all-in-one "hands-on guide" for nontechnical and technical people working in less developed communities. It has been developed and designed with a prestigious team of authors, each of whom has worked extensively in developing societies throughout the world. This field guide includes: - Step-by-step instructions and illustrations showing how to build and maintain a vast array of appropriate technology systems and devices - Unique coverage on healthcare, basic business and project management, principles of design, promotion, scheduling, training, microlending, and more - Teachers, doctors, construction workers, forest and agricultural specialists, scientists and healthcare workers, and religious and government representatives will find this book a first source for advice - Step-by-step instructions and illustrations showing how to build and maintain a vast array of appropriate technology systems and devices - Unique coverage on healthcare, basic business and project management, principles of design, promotion, scheduling, training, microlending, and more - Teachers, doctors, construction workers, forest and agricultural specialists, scientists and healthcare workers, and religious and government representatives will find this book a first source for advice
