The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We have been developing new in situ CO2 and pH sensor (Hybrid CO2-pH sensor: HCS) for the cruising AUV. The measurement principle for the CO2 sensor is based on spectrophotometry. The CO2 in the surrounding seawater equilibrates with the indicator solution across the gas permeable membranes. The equilibration process causes a change of pH in the indicator solution, which results in the change of optical...
Electric power storage is an important technology for all equipments of underwater vehicles however environmental pressure is high, the temperature is 5 degrees Celsius or less, and conditions are unsuitable for many chemical reactions in the deep sea. Battery capacity is mainly dependent on its mass; this means that the cruising range of underwater vehicles is proportional to the mass of the battery...
JAMSTEC has been developing two-type autonomous underwater vehicles (AUVs): a cruising AUV and a working AUV, since last October. These vehicles will perform carbon dioxide (CO2) observations and hydrothermal plume exploration up to depth of 3,000 meters. The cruising AUV (about 4 m long, 2 tons in weight) is equipped with three major observation devices: a multi-beam echo sounder, side-scan sonar,...
In late years, deep-sea investigation becomes important for a study about the global warming, study about ocean earthquake and so on. Recently the vehicle has begun to use for scientific applications. These applications require precise maneuvering of the vehicle for detailed investigations. For high performance maneuvering of the vehicle, it is necessary to design a control system based on a mathematical...
The Japan Agency for Marine-earth Science and Technology is now developing an automatic bottom inspection and sampling mobile, ABISMO, which is a full depth rating remotely operated vehicle for conducting research at the deepest sea bottom, observing the area with a camera, and sampling the bottom layer.
JAMSTEC has planned development of a long-rang cruising AUV. This vehicle will enable over 20 days autonomous cruising. To achieve this vehicle, we need various basic technology developments. In this article, a space distributed CPU system development for achieving highly redundant system control and a stationary satellite control system for remote control of the vehicle are described. We carried...
There are concerns about the impact that global warming will have on our environment, and which will inevitably result in expanding deserts and rising water levels. AUVs (autonomous underwater vehicle) were considered and chosen, as the most suitable tool for conduction survey concerning these global environmental problems. JAMSTEC has started to build a long range cruising AUV. The plan for its development...
In order to reduce a tension on a cable, a deep sea ROV is designed to minimize the weight. However, such a light weight will influence on the movability of crawlers. As an initial investigation experiments were conducted in a water tank using a vehicle of ROV "ABISMO" changing the weight, the buoyancy, the center of gravity and the center of buoyancy. It was observed that the ROV ran unstably...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.