Browsing Reprints by Author "Jensen, Finn B."
Now showing items 1-12 of 12
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Deterministic propagation modelling: Part 1: Fundamental principles *Part 2: Numerical results
Kuperman, William A.; Jensen, Finn B. (NATO. SACLANTCEN, 1981/06)The physics of sound propagation in the ocean is briefly reviewed. The wave equation is presented and a set of solutions under a variety of approximations is discussed. The consistency among these solutions is illustrated. -
Evaluation of experimental techniques for determining the plane wave reflection coefficient at the sea floor
Schmidt, Henrik; Jensen, Finn B. (NATO. SACLANTCEN, 1986/06)One of the most commonly used techniques for determinati on of the geoacoustical properties of the sea bed is the measurement of plane wave reflection coefficients at the ocean bottom. An incident field is pr oduced by ... -
High-frequency normal-mode calculations in deep water
Ferla, Melchiorre C.; Jensen, Finn B.; Kuperman, William A. (NATO. SACLANTCEN, 1982/10)A method has been developed to perform high-frequency deep-water normal-mode calculations in the multikilohertz region in water depths of the order of 5 km. The results from this technique agree with fast field program ... -
High-speed simulation of an underwater acoustic field using an array processor
Kuperman, William A.; Jensen, Finn B.; Martinelli, Giovanna (NATO. SACLANTCEN, 1979/12)A computer model PAREQ for simulating the acoustic field of sound propagating in a complicated ocean environment has been installed on a realtime computer system (HP MX21) which includes an array processor (MAP 300). The ... -
Numerical modeling results for mode propagation in a wedge
Jensen, Finn B.; Tindle, C. T. (NATO. SACLANTCEN, 1987/11)A PE (parabolic equation) code is used to study propagation in a shallow water wedge with a penetrable bottom. Particular attention is given to "wedge modes" that have wave fronts that are arcs of circles centered on the ... -
Review of numerical models in underwater acoustics including recently developed fast-field program
Jensen, Finn B.; Schmidt, Henrik (NATO. SACLANTCEN, 1984/12)Two papers given by SACLANTCEN personnel at the NATO Advanced Research Workshop on Hybrid Formulation of Wave Propagation and Scattering at Castel Gandolfo, Rome, Italy on 30 August to 3 September 1983 are published as a ... -
Review of target strength information for waterside security applications
Zampolli, Mario; Jensen, Finn B.; Tesei, Alessandra (NURC, 2008)Estimates of the target strength of objects, such as for example scuba tanks and swimmer delivery vehicles, are parameters of interest in all phases of the design of waterside security systems. Results of numerical target ... -
Shear properties of ocean sediments determined from numerical modelling of Scholte wave data
Jensen, Finn B.; Schmidt, Henrik (NATO. SACLANTCEN, 1986/06)Recently it has become apparent that shear properties of ocean sediments are most easily determined from measured propagation characteristics of seismic interface waves. We use a newly developed numeri ca l model of wave ... -
Sound propagation in a wedge-shaped ocean with a penetrable bottom
Jensen, Finn B.; Kuperman, William A. (NATO. SACLANTCEN, 1980/07)Modal cutoff during up-slope propagation in a wedge-shaped ocean is studied using the parabolic equation model; theoretical results are compared with some model tank experiments. -
Sound propagation in shallow water: a detailed description of the acoustic field close to surface and bottom
Jensen, Finn B. (NATO. SACLANTCEN, 1982/02)Experimental data are compared with normal-mode predictions for an isovelocity shallow-water propagation channel overlying a complicated layered bottom. Measurements were made close to both the sea surface and the sea floor ... -
Subcritical penetration of narrow Gaussian beams into sediments
Jensen, Finn B.; Schmidt, Henrik (NATO. SACLANTCEN, 1988/03)Complete wave-theory solutions have been obtained numerically for both the reflected and the transmitted fields associated with a narrow Gaussian beam incident on a water-sediment interface near the critical grazing angle. ... -
The optimum frequency of propagation in shallow-water environments
Jensen, Finn B.; Kuperman, William A. (NATO. SACLANTCEN, 1983/04)The optimum frequency of propagation in shallow water environments is the result of competing propagation and attenuation mechanisms at high and low frequencies. It is shown that the optimum frequency is strongly dependent ...