Sentry (AUV)

The Sentry is an autonomous underwater vehicle (AUV) made by the Woods Hole Oceanographic Institution. Sentry is designed to descend to depths of 4,500 metres (14,800 ft) and to carry a range of devices for taking samples, pictures and readings from the deep sea.

Sentry is the successor to ABE (Autonomous Benthic Explorer) and is designed for research at the mid-water and near-seabed depths. The AUV was first trialled in deep-sea operations off Bermuda in April 2006.

Sentry is 6 feet (1.8 m) feet in height, 7.2 feet (2.2 m) wide (including thrusters) and 9.5 feet (2.9 m) long.

Operation

The Sentry is carried to its work location in a container containing all the systems necessary for operation. Communications can be established from land-based or ship-based locations for control and data reception.

Systems

Navigation

Sentry navigates by means of a doppler velocity log combined with an inertial navigation system. These are used in conjunction with a USBL, or LBL, acoustic navigation system which is also used to communicate with the vessel—providing it with commands as well as receiving the data from the sensors and onboard equipment.

Sentry

Sentry may refer to:

Sentry (monitoring system)

Sentry is a highly automated collision monitoring system that continually scans the most current asteroid catalog for possibilities of future impact with Earth over the next 100+ years. Whenever a potential impact is detected it will be analyzed and the results immediately published on the Near Earth Object Program. Two or three weeks of optical data is not enough to conclusively identify an impact years in the future. By contrast, eliminating an entry on the risk page is a negative prediction; a prediction of where it will not be. From the point of view of the general public, it isn't worth getting worried about an object with a couple of weeks of optical data showing a possible Earth encounter years from now.

Sentry Risk Table

The Impact Risk page lists a number of lost objects that are, for all practical purposes, permanent residents of the risk page; their removal may depend upon a serendipitous rediscovery.1997 XR2 was serendipitously rediscovered in 2006 after being lost for more than 8 years. Some objects on the Sentry Risk Table, such as 2000 SG344, might even be man-made.

Sentry (Curtis Elkins)

Sentry (real name Curtis Elkins) is a member of The Jury in the fictional Marvel comic universe. His rank is commanding officer. His ethnicity is African-American.

Fictional character biography

Curtis Elkins was a Guardsman at the Vault a prison for super powered criminals. While there Curtis befriended Hugh Taylor, a new guardsman fresh out of the army. Curtis left the Vault sometime after Hugh was murdered by Venom during an escape.

After that Curtis and a few of his fellow Guardsmen joined The Jury, an agency organized by General Orwell Taylor. Their purpose was to track down and destroy Venom for his part in killing Hugh Taylor, Orwell's eldest son. To that end many of them were armed with sonic and fire generating weapons which the alien symbiote was vulnerable to. After Orwell was arrested for his part in the Arachnis Project, the Jury was reformed by his younger son Maxwell to fit the principles of civil rights and the legal court system. It was in fact a change done in accordance with Curtis' personal ideology of law and order. At a final fight with Hybrid, he was seriously injured, not only by physical damage, but also by mental contact with the symbiotes. Later Sentry and the other members of the Jury would be led by U.S. Agent and financed by Edwin Cord. The Jury was sent after the Thunderbolts but failed.

Autonomous underwater vehicle

An autonomous underwater vehicle (AUV) is a robot which travels underwater without requiring input from an operator. AUVs constitute part of a larger group of undersea systems known as unmanned underwater vehicles, a classification that includes non-autonomous remotely operated underwater vehicles (ROVs) – controlled and powered from the surface by an operator/pilot via an umbilical or using remote control. In military applications AUVs are more often referred to simply as unmanned undersea vehicles (UUVs).

History

The first AUV was developed at the Applied Physics Laboratory at the University of Washington as early as 1957 by Stan Murphy, Bob Francois and later on, Terry Ewart. The "Special Purpose Underwater Research Vehicle", or SPURV, was used to study diffusion, acoustic transmission, and submarine wakes.

Other early AUVs were developed at the Massachusetts Institute of Technology in the 1970s. One of these is on display in the Hart Nautical Gallery in MIT. At the same time, AUVs were also developed in the Soviet Union (although this was not commonly known until much later).

AUV-150

AUV (Autonomous Underwater Vehicle) - 150 is an unmanned underwater vehicle (UUV) being developed by Central Mechanical Engineering Research Institute (CMERI) scientists in Durgapur in the Indian state of West Bengal. The project is sponsored by the Ministry of Earth Sciences and has technical assistance from IIT-Kharagpur.

The vehicle was built with the intent of coastal security like mine counter-measures, coastal monitoring and reconnaissance. AUV 150 can be used to study aquatic life, for mapping of sea-floor and minerals along with monitoring of environmental parameters, such as current, temperature, depth and salinity. It can also be useful in cable and pipeline surveys. It is built to operate 150 metres under the sea and have cruising speed of up to four knots.

Description

Structure

AUV-150 is cylindrical-shaped with streamlined faring to reduce hydrodynamic drag. It is embedded with advanced power, propulsion, navigation, and control systems. The UUV includes a pressurized cabin which is necessary for the diving and flotation system to work properly; this also helps to increase its sealing power against water leakage into the cabin. The AUV 150 weighs 490 kg, is 4.8 metres long and has a diameter of 50 cm.