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Off-axis sonar beam pattern of free-ranging finless porpoises measured by a stereo pulse event data logger
Akamatsu, T; Wang, D; Wang, KX
2005-05-01
Source PublicationJOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
ISSN0001-4966
Volume117Issue:5Pages:3325-3330
AbstractThe 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.; 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.
SubtypeArticle
KeywordBottle-nosed-dolphin Echolocation Signals Neophocaena-phocaenoides Propagation
DepartmentChinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
Subject AreaAcoustics
DOI10.1121/1.1893325
WOS HeadingsScience & Technology ; Technology ; Life Sciences & Biomedicine
Indexed BySCI
Language英语
WOS Research AreaAcoustics ; Audiology & Speech-Language Pathology
WOS SubjectAcoustics ; Audiology & Speech-Language Pathology
WOS IDWOS:000229068700064
WOS KeywordBOTTLE-NOSED-DOLPHIN ; ECHOLOCATION SIGNALS ; NEOPHOCAENA-PHOCAENOIDES ; PROPAGATION
Citation statistics
Cited Times:26[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/9264
Collection期刊论文
AffiliationChinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
Recommended Citation
GB/T 7714
Akamatsu, T,Wang, D,Wang, KX. Off-axis sonar beam pattern of free-ranging finless porpoises measured by a stereo pulse event data logger[J]. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA,2005,117(5):3325-3330.
APA Akamatsu, T,Wang, D,&Wang, KX.(2005).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,117(5),3325-3330.
MLA Akamatsu, T,et al."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 117.5(2005):3325-3330.
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