著者

渡部 守義 新家 富雄 服部 真人

出版者

明石工業高等専門学校

雑誌

若手研究(B)

巻号頁・発行日

2008

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テッポウエビは世界中の海域に普遍的に分布し、独特のパルス音を終始発する発音生物である。海域において、何らかの環境変化によりテッポウエビ類の生息数が変化した場合、水中録音によりその発音数の変化を調査するだけで、その影響を知ることができる。本研究では、テッポウエビの発音数を誰でも簡易に計測するため観測機器を開発した。

著者

新家 富雄 江本 博俊 今津 安成 清水 浩 服部 真人

出版者

海洋理工学会

雑誌

Journal of Advanced Marine Science and Technology Society = 海洋理工学会誌 (ISSN:13412752)

巻号頁・発行日

vol.15, no.1, pp.47-54, 2009-11-07

参考文献数

10

被引用文献数

1

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Passive acoustic biotelemetry for Dugong dugon enabled us to monitor the presence and the position of dugongs by receiving their calls using underwater sound techniques. The principle of the acoustic biotelemetry is to identify the sound source directions of their calls calculated from the time arrival differences between plural hydrophones. This method requires stereo automatic underwater sound monitoring systems. From 2003 to present, we have been developing the stereo underwater recording system. AUSOMS-D (Automatic Underwater Sound Monitoring System for Dugong). AUSOMS-D records underwater sound of frequency band between 20 Hz to 20 kHz by stereo (2ch) hydrophones at sampling frequency of 44.1 kHz with 16 bits resolution for many days. Progresses of AUSOMS-D have been made such as down sizing of the pressure resistant housing, longer recording time and additional scheduling functions. The latest AUSOMS-D is 7 kg in the air weight. It can record up to 15 days continuously with 16 alkaline D cells. AUSOMS-Dwas applied for the survey of dugong in Thailand's water many times.On the other hand, we have developed a stereo towed hydrophone system. The system is called "Towed Aquafeeler". Towed Aquafeeler can receive underwater sound of frequency band between 100 Hz to 20 kHz by 2ch. Recommended tow speed of the system in listing mode is 6 knots or less. Towed Aquafeeler is 11 kg in the air and neutral buoyancy in the water. It was also used for the dugong surveys in Thailand water twice.