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Acoustic Resonance For Nonmetallic Mine Detection
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Book Synopsis Acoustic Resonance for Nonmetallic Mine Detection by :
Download or read book Acoustic Resonance for Nonmetallic Mine Detection written by and published by . This book was released on 1998 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility of acoustic resonance for detection of plastic mines was investigated by researchers at the Oak Ridge National Laboratory's Instrumentation and Controls Division under an internally funded program. The data reported in this paper suggest that acoustic resonance is not a practical method for mine detection. Representative small plastic anti-personnel mines were tested, and were found to not exhibit detectable acoustic resonances. Also, non-metal objects known to have strong acoustic resonances were tested with a variety of excitation techniques, and no practical non-contact method of exciting a consistently detectable resonance in a buried object was discovered. Some of the experimental data developed in this work may be useful to other researchers seeking a method to detect buried plastic mines. A number of excitation methods and their pitfalls are discussed. Excitation methods that were investigated include swept acoustic, chopped acoustic, wavelet acoustic, and mechanical shaking. Under very contrived conditions, a weak response that could be attributed to acoustic resonance was observed, but it does not appear to be practical as a mine detection feature. Transfer properties of soil were investigated. Impulse responses of several representative plastic mines were investigated. Acoustic leakage coupling, and its implications as a disruptive mechanism were investigated.
Book Synopsis Humanitarian Mine Detection by Acoustic Resonance by :
Download or read book Humanitarian Mine Detection by Acoustic Resonance written by and published by . This book was released on 1998 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The JASON Committee at MITRE Corp. was tasked by DARPA to inquire into suitable technologies for humanitarian mine detection. Acoustic resonance was one of the very few technologies that the JASONs determined might be promising for the task, but was as yet unexplored at the time that they conducted their inquiry. The objective of this Seed Money investigation into acoustic resonance was to determine if it would be feasible to use acoustic resonance to provide an improvement to present methods for humanitarian mine detection. As detailed in this report, acoustic resonance methods do not appear to be feasible for this task. Although acoustic resonant responses are relatively easy to detect when they exist, they are very difficult to excite by the non-contact means that must be used for buried objects. Despite many different attempts, this research did not discover any practical means of using sound to excite resonant responses in objects known to have strong resonances. The shaker table experiments did see an effect that might be attributable to the resonance of the object under test, but the effect was weak, and exploited the a priori knowledge of the resonant frequency of the object under test to distinguish it from the background. If experiments that used objects known to have strong acoustic resonances produced such marginal results, this does not seem to be a practical method to detect objects with weak resonances or non-existent resonances. The results of this work contribute to the ORNL countermine initiative. ORNL is exploring several unconventional mine detection technologies, and is proposed to explore others. Since this research has discovered some major pitfalls in non-metallic mine detection, this experience will add realism to other strategies proposed for mine detection technologies. The experiment provided hands-on experience with inert plastic mines under field conditions, and gives ORNL additional insight into the problems of developing practical field-deployable methods of mine detection.
Book Synopsis Detection and Remediation Technologies for Mines and Minelike Targets by :
Download or read book Detection and Remediation Technologies for Mines and Minelike Targets written by and published by . This book was released on 2000 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nonlinear Acoustic Techniques for Land Mine Detection by :
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.
Book Synopsis Nonlinear Acoustic Landmine Detection by : Sean Andrew Genis
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.
Book Synopsis Adaptive Model-Based Mine Detection by :
Download or read book Adaptive Model-Based Mine Detection written by and published by . This book was released on 2009 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The acoustic detection of buried mines is hampered by the fact that at the frequencies required for obtaining useful penetration, the energy is quickly absorbed by the ground. A recent approach which avoids this problem, is to excite the ground with a high-level low frequency sound, which excites low frequency resonances in the mine. These resonances cause a low-level vibration on the surface which can be detected by a Laser Doppler Vibrometer. This paper presents a method of quickly and efficiently detecting these vibrations by sensing a change in the statistics of the signal when the mine is present. Results based on real data are shown.
Book Synopsis The Journal of the Acoustical Society of America by : Acoustical Society of America
Download or read book The Journal of the Acoustical Society of America written by Acoustical Society of America and published by . This book was released on 2007 with total page 1552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Acoustic Land Mine Detection by : ShiXi Joe Qiu
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:
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:
Book Synopsis 2003 Assessment of the Office of Naval Research's Marine Corps Science and Technology Program by : National Research Council
Download or read book 2003 Assessment of the Office of Naval Research's Marine Corps Science and Technology Program written by National Research Council and published by National Academies Press. This book was released on 2004-04-01 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Office of Naval Research (ONR) funds research across a broad range of scientific and engineering disciplines in support of the Navy and Marine Corps. To ensure that its investments are serving those ends and are of high quality, ONR requires each of its departments to undergo annual review. Since 1999, the Naval Expeditionary Warfare Department of ONR has requested that the NRC conduct these reviews. This report presents the results of the second review of the Marine Corps Science and Technology program. The first review was conducted in 2000. The 2003 assessment examines the overall Marine Corps S&T program, the littoral combat future naval capability, the core thrusts of the program, and basic research activities.
Download or read book Army Research and Development written by and published by . This book was released on 1971 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. Senate. Committee on Appropriations. Subcommittee on the Department of the Interior and Related Agencies Publisher : ISBN 13 : Total Pages :1014 pages Book Rating :4.0/5 (1 download)
Book Synopsis Department of the Interior and Related Agencies Appropriations for Fiscal Year 1986: Department of Agricultural by : United States. Congress. Senate. Committee on Appropriations. Subcommittee on the Department of the Interior and Related Agencies
Download or read book Department of the Interior and Related Agencies Appropriations for Fiscal Year 1986: Department of Agricultural written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on the Department of the Interior and Related Agencies and published by . This book was released on 1985 with total page 1014 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. Senate. Committee on Appropriations. Subcommittee on the Department of the Interior and Related Agencies Publisher : ISBN 13 : Total Pages :1356 pages Book Rating :4.:/5 (319 download)
Book Synopsis Department of the Interior and related agencies appropriations for fiscal year 1985 by : United States. Congress. Senate. Committee on Appropriations. Subcommittee on the Department of the Interior and Related Agencies
Download or read book Department of the Interior and related agencies appropriations for fiscal year 1985 written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on the Department of the Interior and Related Agencies and published by . This book was released on 1984 with total page 1356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. Senate. Committee on Appropriations. Subcommittee on the Department of the Interior and Related Agencies Publisher : ISBN 13 : Total Pages :1018 pages Book Rating :4.F/5 ( download)
Book Synopsis Department of the Interior and related agencies appropriations for fiscal year 1986 by : United States. Congress. Senate. Committee on Appropriations. Subcommittee on the Department of the Interior and Related Agencies
Download or read book Department of the Interior and related agencies appropriations for fiscal year 1986 written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on the Department of the Interior and Related Agencies and published by . This book was released on 1985 with total page 1018 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Army RD & A. written by and published by . This book was released on 1970 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Continued Development of Unique Mathematical and Statistical Signal Processing Algorithms for Detecting and Classifing Mines in Acoustic Backscatter by : Christopher F. Barnes
Download or read book Continued Development of Unique Mathematical and Statistical Signal Processing Algorithms for Detecting and Classifing Mines in Acoustic Backscatter written by Christopher F. Barnes and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physics of Buried Mine Detection and Classification by :
Download or read book Physics of Buried Mine Detection and Classification written by and published by . This book was released on 1995 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physics of buried mine detection in offshore sediments and in the surf zone was investigated. Optical techniques are useless because they cannot penetrate sediments while magnetic techniques are of low value because of low resolution, short range, and the introduction of non-magnetic mines. For buried mine detection in the off-shore sediment acoustic penetration at shallow grazing angles was explored. An experiment was conducted jointly with SACLANTCEN to measure sound propagation into a sediment in the 500 Hz to 2 kHz band, and a theoretical fast field model was developed to model the penetration. In the surf zone, where bubble clouds are expected to render acoustic methods unreliable, seismic sonar methods were explored as a means to echo range off buried targets. Tests with controlled pulses revealed that the far-field response was dominated by two interface waves. The results have been very encouraging.
