A large-aperture low-cost hydrophone array for tracking whales from small boats

2009 ◽  
Vol 126 (5) ◽  
pp. 2248-2256 ◽  
Author(s):  
B. Miller ◽  
S. Dawson
Keyword(s):  
Low Cost ◽  
Large Aperture ◽  
Hydrophone Array

scholarly journals Evidences of Intra-Group Orca Call Rate Modulation Using A Small-Aperture Four Hydrophone Array

2020 ◽  
Author(s):  
Marion Poupard ◽  
Helena Symonds ◽  
Paul Spong ◽  
Hervé Glotin
Keyword(s):  
Group Communication ◽  
Low Cost ◽  
Acoustic Emissions ◽  
Research Station ◽  
Spatial Awareness ◽  
Call Rate ◽  
Communication Analysis ◽  
Small Aperture ◽  
Visual Identification ◽  
Hydrophone Array

Abstract Acoustic emissions are vital to orcas (Orcinus orca) to socialize, hunt, orient, and maintain spatial awareness. In order to better analyze their inter and intra-group communication, we propose a novel protocol that allows us to associate vocalizations with their emitter (individual/matriline). Our approach is based on a low cost small-aperture four hydrophone array fixed near the shore up to a few km away from the orcas’ path, operated in conjunction with visual identification. It was conducted in the summer of 2019 off northern Vancouver Island, Canada, at the research station OrcaLab. A total of 722 calls were extracted and localized in azimuth via the hydrophone array from 3 case studies in which different events took place.We then calculated the Call Rate (CR) for each individual/matriline in order to describe their acoustic activity. Results show that CR is modulated according to the distance of the signaler from the joint group, the presence of another group, and the anthropic pressure (nearby cruise ship). This shows evidence of intertwined calls. This protocol does not interfere with the animals and opens new perspectives towards inter and intra-group communication analysis.

Acoustic performance of a large-aperture, seabed, fiber-optic hydrophone array

2004 ◽  
Vol 115 (6) ◽  
pp. 2848-2858 ◽  
Author(s):  
G. A. Cranch ◽  
R. Crickmore ◽  
C. K. Kirkendall ◽  
A. Bautista ◽  
K. Daley ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Acoustic Performance ◽  
Large Aperture ◽  
Hydrophone Array

Low-cost method of fabricating large-aperture, high efficiency, Fresnel diffractive membrane optic using a modified moiré technique

2016 ◽  
Vol 14 (10) ◽  
pp. 100501-100505 ◽  
Author(s):  
Jian Zhang Jian Zhang ◽  
Mengjuan Li Mengjuan Li ◽  
Ganghua Yin Ganghua Yin ◽  
Jianchao Jiao Jianchao Jiao ◽  
Zhengkun Liu Zhengkun Liu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Large Aperture

Large aperture at low cost three-dimensional time-of-flight range sensor using scanning micromirrors and synchronous detector switching

2014 ◽  
Vol 53 (8) ◽  
pp. 1570 ◽  
Author(s):  
Siegwart Bogatscher ◽  
Andreas Streck ◽  
Maik Fox ◽  
Sebastian Meinzer ◽  
Nico Heussner ◽  
...  
Keyword(s):  
Low Cost ◽  
Three Dimensional ◽  
Time Of Flight ◽  
Synchronous Detector ◽  
Range Sensor ◽  
Large Aperture ◽  
Flight Range
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