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学科主题: Acoustics
题名: Off-axis sonar beam pattern of free-ranging finless porpoises measured by a stereo pulse event data logger
作者: Akamatsu, T; Wang, D; Wang, KX
关键词: BOTTLE-NOSED-DOLPHIN ; ECHOLOCATION SIGNALS ; NEOPHOCAENA-PHOCAENOIDES ; PROPAGATION
刊名: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
发表日期: 2005-05-01
DOI: 10.1121/1.1893325
卷: 117, 期:5, 页:3325-3330
收录类别: SCI
文章类型: Article
部门归属: Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
WOS标题词: Science & Technology ; Technology ; Life Sciences & Biomedicine
类目[WOS]: Acoustics ; Audiology & Speech-Language Pathology
研究领域[WOS]: Acoustics ; Audiology & Speech-Language Pathology
摘要: The off-axis sonar beam patterns of eight free-ranging finless porpoises were measured using attached data logger systems. The transmitted sound pressure level at each beam angle was calculated from the animal's body angle, the water surface echo level, and the swimming depth. The beam pattern of the off-axis signals between 45 and 115 (where 0 corresponds to the on-axis direction) was nearly constant. The sound pressure level of the off-axis signals reached 162 dB re 1 mPa peak-to-peak. The surface echo level received at the animal was over 140 dB, much higher than the auditory threshold level of small odontocetes. Finless porpoises are estimated to be able to receive the surface echoes of off-axis signals even at 50-m depth. Shallow water systems (less than 50-m depth) are the dominant habitat of both oceanic and freshwater populations of this species. Surface echoes may provide porpoises not only with diving depth information but also with information about surface direction and location of obstacles (including prey items) outside the on-axis sector of the sonar beam. 2005 Acoustical Society of America.
英文摘要: The off-axis sonar beam patterns of eight free-ranging finless porpoises were measured using attached data logger systems. The transmitted sound pressure level at each beam angle was calculated from the animal's body angle, the water surface echo level, and the swimming depth. The beam pattern of the off-axis signals between 45 and 115 (where 0 corresponds to the on-axis direction) was nearly constant. The sound pressure level of the off-axis signals reached 162 dB re 1 mPa peak-to-peak. The surface echo level received at the animal was over 140 dB, much higher than the auditory threshold level of small odontocetes. Finless porpoises are estimated to be able to receive the surface echoes of off-axis signals even at 50-m depth. Shallow water systems (less than 50-m depth) are the dominant habitat of both oceanic and freshwater populations of this species. Surface echoes may provide porpoises not only with diving depth information but also with information about surface direction and location of obstacles (including prey items) outside the on-axis sector of the sonar beam. 2005 Acoustical Society of America.
关键词[WOS]: BOTTLE-NOSED-DOLPHIN ; ECHOLOCATION SIGNALS ; NEOPHOCAENA-PHOCAENOIDES ; PROPAGATION
语种: 英语
WOS记录号: WOS:000229068700064
ISSN号: 0001-4966
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/152342/9264
Appears in Collections:中科院水生所知识产出(2009年前)_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China

Recommended Citation:
Akamatsu, T; Wang, D; Wang, KX.Off-axis sonar beam pattern of free-ranging finless porpoises measured by a stereo pulse event data logger,JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA,2005,117(5):3325-3330
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