Unveiling a new deep water acoustic receiver and deep water acoustic source

2003 ◽  
Author(s):  
Stephen E. Spychalski
Keyword(s):  
Deep Water ◽  
Acoustic Source ◽  
Acoustic Receiver

Directional Response of a Horizontal Linear Array to an Acoustic Source at Close Range in Deep Water

2021 ◽  
Author(s):  
Yanqun Wu ◽  
Wen Zhang ◽  
Zhengliang Hu ◽  
Weihua Zhang ◽  
Bingbing Zhang ◽  
...  
Keyword(s):  
Deep Water ◽  
Linear Array ◽  
Acoustic Source ◽  
Directional Response ◽  
Close Range

scholarly journals Fiber-optic vector acoustic receiver based on adaptive holographic interferometer

Laser Physics ◽  
2022 ◽  
Vol 32 (2) ◽  
pp. 025101
Author(s):  
R V Romashko ◽  
D V Storozhenko ◽  
M N Bezruk ◽  
D A Bobruyko ◽  
Y N Kulchin
Keyword(s):  
Acoustic Waves ◽  
Fiber Optic ◽  
Field Tests ◽  
Water Area ◽  
Acoustic Source ◽  
Acoustic Intensity ◽  
Holographic Interferometer ◽  
Intensity Vector ◽  
Fiber Optical ◽  
Acoustic Receiver

Abstract A mobile scalar–vector acoustic receiver is proposed, experimentally implemented and investigated. The key components of the receiver are (a) the six-channel fiber-optic coil-type sensor configured as to detect three projections of acoustic intensity vector, (b) the six-channel optical phase demodulator based on six-channel adaptive holographic interferometer configured with use of dynamic holograms multiplexed in a photorefractive crystal of cadmium telluride and (c) the signals recording ADC-based system combined with software package for data processing. Field tests of the developed receiver applied for obtaining scalar and vector parameters of acoustic waves generated by a stationary and moving acoustic source in open air and water area are carried out. Experimental results show perceptiveness of use of the fiber-optical adaptive interferometry system for bearing of weak acoustic sources in real conditions.

Benthic foraminiferal zonation in deep-water carbonate platform margin environments, northern Little Bahama Bank

1988 ◽  
Vol 62 (01) ◽  
pp. 1-8 ◽  
Author(s):  
Ronald E. Martin
Keyword(s):  
Deep Water ◽  
Benthic Foraminifera ◽  
Carbonate Platform ◽  
Sedimentary Facies ◽  
Depositional Environments ◽  
Near Surface ◽  
Sediment Gravity Flows ◽  
Gravity Flows ◽  
Platform Margin ◽  
Water Carbonate

The utility of benthic foraminifera in bathymetric interpretation of clastic depositional environments is well established. In contrast, bathymetric distribution of benthic foraminifera in deep-water carbonate environments has been largely neglected. Approximately 260 species and morphotypes of benthic foraminifera were identified from 12 piston core tops and grab samples collected along two traverses 25 km apart across the northern windward margin of Little Bahama Bank at depths of 275-1,135 m. Certain species and operational taxonomic groups of benthic foraminifera correspond to major near-surface sedimentary facies of the windward margin of Little Bahama Bank and serve as reliable depth indicators. Globocassidulina subglobosa, Cibicides rugosus, and Cibicides wuellerstorfi are all reliable depth indicators, being most abundant at depths >1,000 m, and are found in lower slope periplatform aprons, which are primarily comprised of sediment gravity flows. Reef-dwelling peneroplids and soritids (suborder Miliolina) and rotaliines (suborder Rotaliina) are most abundant at depths <300 m, reflecting downslope bottom transport in proximity to bank-margin reefs. Small miliolines, rosalinids, and discorbids are abundant in periplatform ooze at depths <300 m and are winnowed from the carbonate platform. Increased variation in assemblage diversity below 900 m reflects mixing of shallow- and deep-water species by sediment gravity flows.

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