Off-axis sonar beam pattern of free-ranging finless porpoises measured by a stereo pulse event data logger
文献类型：期刊论文
| 作者 | Akamatsu, T; Wang, D; Wang, KX |
| 刊名 | JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
 |
| 出版日期 | 2005-05-01 |
| 卷号 | 117期号:5页码:3325-3330 |
| 关键词 | BOTTLE-NOSED-DOLPHIN ECHOLOCATION SIGNALS NEOPHOCAENA-PHOCAENOIDES PROPAGATION |
| ISSN号 | 0001-4966 |
| 中文摘要 | 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. |
| 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. |
| WOS标题词 | Science & Technology ; Technology ; Life Sciences & Biomedicine |
| 学科主题 | Acoustics |
| 类目[WOS] | Acoustics ; Audiology & Speech-Language Pathology |
| 研究领域[WOS] | Acoustics ; Audiology & Speech-Language Pathology |
| 关键词[WOS] | BOTTLE-NOSED-DOLPHIN ; ECHOLOCATION SIGNALS ; NEOPHOCAENA-PHOCAENOIDES ; PROPAGATION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000229068700064 |
| 公开日期 | 2010-10-13 |
| 源URL | [http://ir.ihb.ac.cn/handle/152342/9264]  |
| 专题 | 水生生物研究所_中科院水生所知识产出（2009年前）_期刊论文 |
| 作者单位 | Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：水生生物研究所
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