Browsing by Subject "Underwater Acoustics"
Now showing items 1-20 of 22
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Acoustic ambient noise recorder
(New Delhi: Publications and Information Directorate, 1994)The present-day practices of measurement and continuous monitoring of environmental parameters in oceanography utilise compact and low powered devices suitable for long periods of operation. These devices deployed in the ... -
An Acoustic Wave Gauge
(Cochin: NPOL, 1980) -
Canonical sound speed profile for the central Bay of Bengal
(Indian Academy of Sciences, Bangalore, 1989)Following Munk's canonical theory, an algorithm has been presented for computing sound channel parameters in the western and southern Bay of Bengal. The estimated canonical sound speed profile using these parameters has ... -
Chemical absorption of acoustic energy due to an eddy in the western Bay of Bengal
(Ultrasonics Society of India, 1994)Acoustic energy losses due to chemical absorption, within the western Bay of Bengal, in the presence of a subsurface meso-scale cold core eddy has been analysed. These estimates, for two different frequencies - 400 Hz and ... -
Coaxial circular array for underwater transducer application - a critical appraisal of its effectiveness
(American Association of Physics Teachers, 1988) -
Coaxial circular array: Study of farfield pattern and field frequency responses
(Acoustical Society of America, 1986) -
Effect of scattering due to seafloor microrelief on a multifrequency-sonar seabed profiler
(Acoustical Society of America, 1989) -
Mutual interaction effects between array elements at different wavelengths in a coaxial circular array
(Acoustical Society of America, 1988) -
Observations on the scattering layers over the continental shelf off Konkan coast (India)
(National Institute of Sciences of India, 1968)The echograms obtained by R.V. "varuna" using asdic during the September, 1963 cruise are analysed. Scattering layers observed over the shelf area, off Ratnagiri, are examined and studied in relation to the thermocline ... -
Ocean acoustic tomography - a modern tool for ocean measurements
(Hyderabad: AEG, 1984) -
Performance appraisal of multibeam system - Hydrosweep at different seabed provinces
(New Delhi: Publications and Information Directorate, 1994)The performance of the multibeam sounding system (hydrosweep system) has been assessed at three varying zones of the seabed-continental shelf, continental slope, and deepsea seamount areas. Statistical studies were performed ... -
Reference sound speed profile and related ray acoustics of Bay of Bengal for tomographic studies
(European Acoustics Association, 1994)Using the archived hydrographic data, a climatological mean sound speed profile has been developed for the Bay of Bengal which will serve as an input (reference profile) to acoustic models. This profile is depth limited ... -
Research vessels
(New Delhi: Department of Ocean Development, 1988)The role of the research vessels as a tool for marine research and exploration is very important. Technical requirements of a suitable vessel and the laboratories needed on board are discussed. The history and the research ... -
Seafloor micro-roughness, benthic macro-fauna, and sediment substrate: A study of their interrelationship using high-frequency echo-sounding systems
(CSIR-NISCAIR, 2015)The spatial variability of sediment geoacoustic inversion results, derived from dual-frequency single-beam (SBES) and multi-beam echosounder system (MBES) operable at 33/210 kHz and 95 kHz, respectively, have been analyzed ... -
Sidelobe supressed beam-patterns of a coaxial circular array at operating wavelengths useful to underwater transducer applications
(Parjon Information Services, 1987) -
Small Scale features of sound Velocity structure in the Northern Arabian Sea during February - May 1974
(CSIR-NISCAIR, 1980)Microstructure of sound velocity in the upper 500 m of the northern Arabian Sea based on STD (salinity-temperature-depth profiler) data is presented. Relatively warm and saline waters of the Persian Gulf intruding into the ... -
Sound-speed prediction as a function of temperature at discrete depths in the Bay of Bengal
(Defence Research and Development Organisation, 1988) -
Studies on coaxial circular array for underwater transducer applications
(1989)This thesis presents analytical methods to study important aspects of a coaxial circular array for wideband underwater transducer application. It begins with detailed theoretical study of a coaxial circular array of three ...