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Japan Marine Science and Technology Center Deep Sea Research Department -8 Sensor noise obs1 xh.gal obs1 yh.gal obs1 zh.gal -8 Sensor noise obs1 xh.gal obs1 yh.gal obs1 zh.gal -10 -12 -14 Power spectral density log[[m/s ** 2] ** 2/Hz] -10 -12 -14 Power spectral density log[[m/s ** 2] ** 2/Hz] -16 4 6 8 2 4 6 8 2 4 6 8 2 4 6 8 2 4 10 -2 10 -1 10 0 10 1 Frequency [Hz] 2000/01/06 0600-0700 JST -16 4 6 8 2 4 6 8 2 4 6 8 2 4 6 8 2 4 10 -2 10 -1 10 0 10 1 Frequency [Hz] 2002/10/26 0400-0500 JST Fig. 6 Improvement in signal quality after burying the cabled seismographs (Cabled Observatory System #2 off Hokkaido). Left panel is before burying. Right panel is after burying showing improvements in frequencies above about 0.1 Hz. Brief summary of sea bottom surveys conducted/participated by DSRD 2002 April - 2003 March EW0202/0203 Feb-Apr Marianas KY02-05 Apr Japan Trench Observatory/Sagami Bay KR02-05 Apr Izu-Ogasawara Arc NT02-07 May-Jun Ryukyu Arc YK02-02 May-Jun Nankai Trough KR02-07 Jun Cable System #2 NT02-08 Jun Ryukyu Arc KR02-08 Jun-Jul JT and WP-2 Observatories KY02-07 Jul Sagami Bay/Cable System #2/JT Observatory YK02-04/05 Jul Hawaii Islands KR02-10 Jul-Aug Nankai Trough KR02-11 Aug-Sep Nankai Trough NT02-09 Aug-Sep Izu-Ogasawara Arc KY02-09 Aug-Sep S Japan Sea NT02-10 Sep Izu-Ogasawara Arc KR02-12 Oct WP-1 Observatory YK02-07 Oct Indonesia KR02-14 Oct-Nov Marianas KR02-15 Nov-Dec NW Pacific KY02-11 Dec Ryukyu Arc KY02-12 Dec-Jan Nankai Trough YK02-10 Dec-Jan French Polynesia KY03-01 Jan-Feb Marianas NT: R/V Natsushima (mother vessel of Shinkai 2000, ROV Dolphin 3K) KY: R/V Kaiyo (mother vessel of ROV Hyper Dolphin) KR: R/V Kairei (mother vessel of ROV Kaiko) YK: R/V Yokosuka (mother vessel of Shinkai 6500) 23
Japan Marine Science and Technology Center Research Activities Marine Technology Department Outline and research policy The Marine Technology Department provides the means to gain a better understanding of the ocean and the earth through the research and development of marine research vessels and marine system such as deep-sea research submersibles, remotely operated vehicles, and ocean observation buoys, and also the research and development of underwater acoustic technology and other important, broadly usable and innovative technologies needed for ocean observation. Research vessels, marine systems and technologies developed by the Department are widely used and highly regarded by researchers not just in JAMSTEC, but from many other research institutions as well. The Department aims at actively contributing to the advancement of the ocean and the earth science and technology through research and development of sub-surface exploration systems for obtaining information on the earth's interior under the deep seafloor, such as the deep-sea drilling vessel, ocean survey systems such as the autonomous underwater vehicle capable of independently cruising long distances while gathering data on the ocean, and intelligent robots, and basic systems for marine research or development such as ocean development equipment for effectively utilizing vast marine resources including energy, and for protecting and improving the global environment, and also through research and development into underwater acoustic technology, underwater power sources, sensors, and other advanced technologies that can meet increasingly sophisticated ocean survey and research needs. 1. Research Project ; Category 1 (1) Research and development on advanced technologies From Fiscal (a) Research on video technology The pictures taken by a underwater TV camera provide a very important information to operator of a remotely operated vehicle (ROV). To provide realistic pictures to operators and researchers, this research introduces the VR (Virtual reality) technology that has recently made a great progress. Deep-sea underwater TV cameras are covered with protective pressure-proof glass, but distortions can appear in the images filmed through the glass. This fiscal year, the underwater TV image mosaicking system developed by JAMSTEC, which corrects image distortion and color and combines multiple images into a single seamless image, underwent comprehensive trials in actual ROV operations. The results of these trials were very successful. autonomous underwater vehicle (AUV) in an effort to extend its cruising range. We are carrying out R&D into the fuel (hydrogen gas) and oxidizing agent (oxygen gas) used in the fuel cell. This fiscal year we carried out connection tests to confirm the suitability of two kinds of Metal Hydrides (MH) (AB and BCC) in the AUV, and confirmed that the supply of hydrogen gas for observation device of AUV is stable even with load changes. However, we discovered that the while the AB type MH is suitable for use in the AUV and is easy to operate and maintain, from the viewpoint of storage volume, it is not fit for actual sea trials. And while the BCC type MH showed positive results in suitability for use in the AUV and storage volume, it is not suited to sea trials from an operability and maintenance perspective. From this, we produced the new AB type MH and conducted tests on its hydrogen storage performance, release characteristics, and connection to the AUV. The tests confirmed that it is suited to undergo sea trials. (b) Research on power sources The Department is conducting research into the use of solid Polymer Electrode Fuel Cell in the (c) Underwater acoustic technology We are undertaking research on communicating with manned submersibles, un-tethered remotely oper- 25
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