Infrasonic Noise Measurements in Ocean Using Screened Hydrophones

Effects of screening a hydrophone with open-cell foams are determined to reduce the level of infrasonic background noise, which is the self-noise probably induced by the presence of flow around the hydrophone, in shallow and deep seas. The result obtained in shallow sea with bottom-mounted geometry...

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Veröffentlicht in:Japanese Journal of Applied Physics 2010-07, Vol.49 (7), p.07HG06-07HG06-2
Hauptverfasser: Lee, Seongwook, Lee, Yong-Kuk, Yoo, Hai-Soo, Kim, Seong-Ryul, Jeong, Kap-Sik, Park, Yosup, Na, Jungyul, Yoon, Jong Rak, Lee, Phil-Ho
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container_end_page 07HG06-2
container_issue 7
container_start_page 07HG06
container_title Japanese Journal of Applied Physics
container_volume 49
creator Lee, Seongwook
Lee, Yong-Kuk
Yoo, Hai-Soo
Kim, Seong-Ryul
Jeong, Kap-Sik
Park, Yosup
Na, Jungyul
Yoon, Jong Rak
Lee, Phil-Ho
description Effects of screening a hydrophone with open-cell foams are determined to reduce the level of infrasonic background noise, which is the self-noise probably induced by the presence of flow around the hydrophone, in shallow and deep seas. The result obtained in shallow sea with bottom-mounted geometry shows that the level of background noise could be reduced by more than 20 dB below 10 Hz if the hydrophone is screened. Also, the result of ship noise measurement conducted in deep sea with drifting geometry shows that a maximum background noise reduction of 15 dB could be achieved in the infrasonic band without affecting the true acoustic signals.
doi_str_mv 10.1143/JJAP.49.07HG06
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title Infrasonic Noise Measurements in Ocean Using Screened Hydrophones
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