Bottom Reverberation Measured With Explosive Charges Fired Deep In The Ocean PDF Download
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Author | : H. M. Merklinger |
Publisher | : |
Total Pages | : 8 |
Release | : 1967 |
Genre | : |
ISBN | : |
Download Bottom Reverberation Measured With Explosive Charges Fired Deep in the Ocean Book in PDF, ePub and Kindle
Bottom reverberation was measured at five locations in the North Atlantic using a hydrophone and explosive charges suspended near the ocean floor. Measured backscattering strengths in the frequency range from 800 Hz to 12.8 kHz show a tendency to rise moderately with frequency. The dependence on grazing angle was found to vary between a sine to the one-half and a sine-squared relation. Measurements made at several depths indicate that a portion of the reverberation originates in the subbottom layer structure directly beneath the point of measurement. At frequencies above 400 Hz, this reverberation from the subbottom appears to contribute significantly only at the steeper grazing angles. (Author).
Author | : Dale D. Ellis |
Publisher | : Springer Science & Business Media |
Total Pages | : 399 |
Release | : 2012-12-06 |
Genre | : Technology & Engineering |
ISBN | : 9401120781 |
Download Ocean Reverberation Book in PDF, ePub and Kindle
During the past decade there has been a renewed interest in active sonar systems at both low and medium frequencies. More recently this interest has been extended to very high frequencies in shallow water. Reverberation often limits the detection performance of these systems, and there is a need to understand the underlying mechanisms that cause the scattering. With more emphasis being given to reverberation phenomena in the Scientific Program of Work at the SACLANT Undersea Research Centre, it was considered an opportune time to host a meeting, bringing together scientists from NATO countries to foster cross-disciplinary dialogue and generate ideas for new research directions. Consequently the Ocean Reverberation Symposium was held 25-29 May 1992 in La Spezia, Italy. Over 60 presentations were made on a diverse selection of topics, of which ten papers will be published as a SACLANTCEN Conference Proceedings. The papers in this volume are grouped into 8 sections, usually in the same order as presented at the corresponding session of the Symposium: Section 1 - Scattering Mechanisms Section 2 - High Frequency Measurements and Mechanisms Section 3 - Reverberation Modelling Section 4 - ARSRP Mid-Atlantic Ridge Experiment Section 5 - Low Frequency Measurements Section 6 - Volume Scattering Section 7 - Signal Processing Issues Section 8 - Applications Taken together the papers show some emerging trends in the research.
Author | : T. Akal |
Publisher | : Springer Science & Business Media |
Total Pages | : 898 |
Release | : 2013-03-09 |
Genre | : Science |
ISBN | : 1461322014 |
Download Ocean Seismo-Acoustics Book in PDF, ePub and Kindle
Seafloor investigation has long been a feature of not only seismology but also of acoustics. Indeed it was acoustics that produced depth sounders, giving us the first capability of producing both global and local maps of the seafloor. Subsequently, better instrumentation and techniques led to a clearer, more quantitative picture of the seabed itself, which stimulated new hypotheses such as seafloor spreading through the availability of more reliable data on sediment thickness over ocean basins and other bottom features. Geologists and geophysicists have used both acoustic and seismic methods to study the seabed by considering the propagation of signals arising from both natural seismic events and man-made impulsive sources. Although significant advances have been made in instrumentation, such as long towed geophysical arrays, ai r guns and ocean bot tom seismometers, the pic ture of the seafloor is still far from complete. Underwater acoustics concerns itself today with the phenomena of propagation and noise at frequencies and ranges that require an understanding of acoustic interaction at both of its boundaries, the sea surface and seafloor, over depths ranging from tens to thousands of meters. Much of the earlier higher frequency (>1 kHz) work included the characterization of the seafloor in regimes of reflection coefficients which were empirically derived from surveys. The results of these studies met with only limited success, confined as they were to those areas where survey data existed and lacking a physical understanding of the processes of reflection and scattering.
Author | : Harold Merklinger |
Publisher | : Springer Science & Business Media |
Total Pages | : 815 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 1461318718 |
Download Progress in Underwater Acoustics Book in PDF, ePub and Kindle
IMAGE TRACKS AT HALIFAX by L.B. Felsen All living kind much effort spend Some model modes, some model rays, To cope with their environment Some feel that spectra all portrays. Some use their eyes, some use their nose Then there are those who with despatch, To sense where other things repose. Take refuge in the ocean wedge. For one group, nothing's more profound Than to explore the world with sound. If things get messy, randomize. These audio diagnosticians What's partly smooth, determinize. You ponder, is it this or that? Go by the name of acousticians. And wish you were a lowly bat They regularly meet to check Whether their sonogram's on track. The meeting's hosts did treat us well. With images stored in their packs, They let the climate cast its spell. This year they came to Halifax. No weath'ry hope was placed in vain. There they combined with ocean types We were exposed to wind and rain, And each could hear the other's gripes. We glimpsed blue sky through clouds dispersed. A meeting naturally does start But rainy sequence was reversed: Reviewing present state of art. The ocean types would like it wet What we found out is where it's at: Yet they got stuck with sun instead. We cannot hope to match the bat Each confrence has the same refrain: Computer printouts by the reams It has been fun to meet again.
Author | : Nicholas G. Pace |
Publisher | : Springer Science & Business Media |
Total Pages | : 592 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 9401006261 |
Download Impact of Littoral Environmental Variability on Acoustic Predictions and Sonar Performance Book in PDF, ePub and Kindle
The limiting influence of the environment on sonar has long been recognised as a major challenge to science and technology. As the area of interest shifts towards the lit toral, environmental influences become dominant both in time and space. The manyfold challenges encompass prediction, measurement, assessment and adaptive responses to maximize the effectiveness of systems. Although MCM and ASW activities are dom inated in different ways and scales by the environment, both warfare areas have had to consider the significantly changing requirements posed by operations in the littoraL The fundamental scientific issues involved in developing models relating acoustics to the environment are matched in difficulty by the need for data for their validation and eventual practical use for prediction. In many instances the need is for on-line adaptation of systems to changing circumstances whilst other needs are for the Ionger term planning activities. This book and the attached full-color CD are the proceedings of a conference organ ised by the SACLANT Undersea Research Centre, held at Villa Marigola, Lerici, Italy, on 16-20 September 2002. The fundamental problems associated with environmental 1 variability and sonar were explored at a previous SACLANTCEN conference in 1990. These problems have not gone away but, on the one hand are exaggerated by the move to the littoral and on the other hand, are open to treatrnent in new ways that advances in technology and computer power allow.
Author | : |
Publisher | : |
Total Pages | : 1090 |
Release | : 1969 |
Genre | : Mechanics, Applied |
ISBN | : |
Download Applied Mechanics Reviews Book in PDF, ePub and Kindle
Author | : Robert J. Urick |
Publisher | : McGraw-Hill Companies |
Total Pages | : 448 |
Release | : 1983 |
Genre | : Science |
ISBN | : |
Download Principles of Underwater Sound Book in PDF, ePub and Kindle
Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.
Author | : Nolan R. Davis |
Publisher | : |
Total Pages | : 64 |
Release | : 1993 |
Genre | : Ocean bottom |
ISBN | : |
Download Measurement of Ocean Surface and Bottom Backscattering Strengths in the Northwestern Atlantic Ocean Book in PDF, ePub and Kindle
Author | : Acoustical Society of America |
Publisher | : |
Total Pages | : 1384 |
Release | : 2005 |
Genre | : Acoustical engineering |
ISBN | : |
Download The Journal of the Acoustical Society of America Book in PDF, ePub and Kindle
Author | : Institute of Electrical and Electronics Engineers |
Publisher | : |
Total Pages | : 904 |
Release | : 1977 |
Genre | : Acoustical engineering |
ISBN | : |
Download 1977 IEEE International Conference on Acoustics, Speech, & Signal Processing, Held at the Sheraton-Hartford Hotel, Hartford, Connecticut, May 9-11, 1977 Book in PDF, ePub and Kindle