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Design and benchmark tests of a hydrophone array system for whale echolocation recordings

Starkhammar, Josefin LU ; Amundin, Mats; Nilsson, Johan LU ; Jansson, Tomas LU ; Almqvist, Monica LU and Persson, Hans W LU (2012) In Open Journal of Acoustics 2(3). p.121-130
Abstract
This paper describes in depth the design and application considerations of a computer based measurement system enabling 1 MS/s simultaneous sampling of 47 hydrophones for cross sectional recordings of echolocation beams of toothed whales (Odontocetes). An earlier prototype version of the system has previously only been presented as a brief proof of principle that did not offer a complete description of the software and hardware solution. Crucial hardware and software design considerations of the further developed system include the re-arm times of the burst mode sampling and the dual-core distributed execution of the software components. The rearm time was measured to 283 µs, using a 550 µs long sample window around each click. This... (More)
This paper describes in depth the design and application considerations of a computer based measurement system enabling 1 MS/s simultaneous sampling of 47 hydrophones for cross sectional recordings of echolocation beams of toothed whales (Odontocetes). An earlier prototype version of the system has previously only been presented as a brief proof of principle that did not offer a complete description of the software and hardware solution. Crucial hardware and software design considerations of the further developed system include the re-arm times of the burst mode sampling and the dual-core distributed execution of the software components. The rearm time was measured to 283 µs, using a 550 µs long sample window around each click. This enables burst mode sampling of clicks with an inter-click interval as short as 833 µs. It is shown through both synthetic benchmark tests of the system and through field measurements of bottlenose dolphins (Tursiops truncatus) and a beluga whale (Delphinapterus leucas) that it is capable of acquiring, analyzing and visualizing data in run-time. It operates effectively also in highly reverberant surroundings like concrete pools and shallow waters. Burst mode sampling allows the system to block reflections with 0.3 - 0.5 m longer propagation paths than the direct path. It is suggested that the system’s compliance to reverberant recording sites makes it valuable in future dolphin echolocation studies. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Open Journal of Acoustics
volume
2
issue
3
pages
121 - 130
ISSN
2162-5794
DOI
10.4236/oja.2012.23014
language
English
LU publication?
yes
id
96d06d3f-fc38-4d82-b8db-b2aa0e1c278f
alternative location
http://file.scirp.org/Html/4-1610028_22596.htm
date added to LUP
2017-05-18 14:53:10
date last changed
2017-05-18 15:06:18
@article{96d06d3f-fc38-4d82-b8db-b2aa0e1c278f,
  abstract     = {This paper describes in depth the design and application considerations of a computer based measurement system enabling 1 MS/s simultaneous sampling of 47 hydrophones for cross sectional recordings of echolocation beams of toothed whales (Odontocetes). An earlier prototype version of the system has previously only been presented as a brief proof of principle that did not offer a complete description of the software and hardware solution. Crucial hardware and software design considerations of the further developed system include the re-arm times of the burst mode sampling and the dual-core distributed execution of the software components. The rearm time was measured to 283 µs, using a 550 µs long sample window around each click. This enables burst mode sampling of clicks with an inter-click interval as short as 833 µs. It is shown through both synthetic benchmark tests of the system and through field measurements of bottlenose dolphins (Tursiops truncatus) and a beluga whale (Delphinapterus leucas) that it is capable of acquiring, analyzing and visualizing data in run-time. It operates effectively also in highly reverberant surroundings like concrete pools and shallow waters. Burst mode sampling allows the system to block reflections with 0.3 - 0.5 m longer propagation paths than the direct path. It is suggested that the system’s compliance to reverberant recording sites makes it valuable in future dolphin echolocation studies. },
  author       = {Starkhammar, Josefin and Amundin, Mats and Nilsson, Johan and Jansson, Tomas and Almqvist, Monica and Persson, Hans W},
  issn         = {2162-5794},
  language     = {eng},
  number       = {3},
  pages        = {121--130},
  series       = {Open Journal of Acoustics},
  title        = {Design and benchmark tests of a hydrophone array system for whale echolocation recordings},
  url          = {http://dx.doi.org/10.4236/oja.2012.23014},
  volume       = {2},
  year         = {2012},
}