Sonardyne Retrieves Pressure Inverted Echo Sounder

Press Release
Wednesday, March 14, 2012
Sonardyne’s Inverted Echo Sounder (Photo: Sonardyne)

Sonardyne International has retrieved its first Pressure Inverted Echo Sounder (PIES) off the coast of Hawaii.

 

This new sensor logging node is designed to accurately measure the average sound velocity through a column of water from the seabed to the sea surface. The information gathered will help oceanographers to better understand the dynamics of the ocean and atmosphere-ocean coupling. On September 24, the Sonardyne PIES was free-fall deployed into a 960-meter deep water channel close to the big island of Hawaii, and commanded to log average sound velocity readings every seven minutes. Now engineers have returned to the site and recovered the unit by acoustically commanding it to float to the surface under its own buoyancy.


Pressure inverted echo sounding is a technique which works by transmitting an acoustic pulse from a PIES instrument on the seabed upwards. The pulse is reflected off the water-air boundary at the sea surface and returns back down to the seabed, where it is detected by the PIES. This enables an exact measurement of the two-way signal travel time to be calculated. At the same instant, an accurate measurement of depth is made using highly precise internal pressure sensors. Average water column velocity can then be calculated directly from the depth (i.e. distance) and travel time data. 
 

“We were keen to evaluate the performance of PIES, so our team began the analysis of its data as soon as it was recovered,” said Shaun Dunn, Engineering Business Development Manager at Sonardyne. “Initial analysis suggests that there was very little variation in the sound velocity during the 39-day recording period with a fairly stable average of around 1500m/s throughout the deployment. This figure correlates well with independent measurements made at the deployment site. The data demonstrates the ability to accurately track the average water column sound velocity over long periods, and this is thought to be of significant interest to oceanographers to enable them to better understand the physical processes which occur in the deep ocean.”

Maritime Reporter March 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

Carnival Sails to Profit

The world's largest cruise company Miami-based Carnival Corp reported a net profit of $49 million, or 6 cents per share in the first quarter ended Feb. 28.   That

Ukraine Arrests Turkish Ship for Visiting Crimean Port

Turkey owned merchant ship flying the flag of Tuvalu was arrested by Ukrainian authorities over a visit it made to a port in Crimea, reports Reuters. The ship's captain detained.

USCG Flush Ice down River Systems to Facilitate Shipping

The Coast Guard cutter fleet is flushing ice through the Great Lakes river systems to prevent ice jams and facilitate commercial shipping as the shipping season

Technology

Austal Graduates 48 4-Yr Apprentices

Austal USA combined two classes to graduate a total of 48 members of Austal’s cutting-edge four-year apprenticeship program yesterday at a formal ceremony held at the Arthur R.

SimCity

Building Capacity, as Deadline for Trained Crews Nears   “You see that ship. That’s our ship,” says Karsten Saevik, as he directs our attention to the virtual

Maritime Training Five Years from Now: A Look Ahead

For anyone involved in maritime training, now is an incredibly exciting time full of opportunity. More than ever before, there are new advanced techniques and technologies

New Products

New Workwear Lifejacket Introduced

Ocean Safety has introduced a new range of workwear lifejackets.   The new Kru Workwear range completes Ocean Safety’s lifejacket offering, providing a wide choice

MOL’s Coal Carrier for Tokyo Electric Power

Mitsui O.S.K. Lines, Ltd. today announced that the coal carrier Hakutaka, which will serve Tokyo Electric Power Company, Inc. was delivered at Mizushima Shipyard

Swire Pacific Offshore Acquires 2 Newbuildings

Shipowner and operator, Swire Pacific Offshore Operations (Pte) Ltd (SPO) celebrated the naming of two new vessels, Pacific Centurion, an Anchor Handling Tug Supply (AHTS) vessel,

Marine Electronics

Washington State Ferry Tacoma Returns to Service

Washington State Ferry M/V Tacoma will return to work on the Seattle/Bainbridge Island route starting March 28 after suffering electrical damage last summer.   The

SimCity

Building Capacity, as Deadline for Trained Crews Nears   “You see that ship. That’s our ship,” says Karsten Saevik, as he directs our attention to the virtual

Maritime Training Five Years from Now: A Look Ahead

For anyone involved in maritime training, now is an incredibly exciting time full of opportunity. More than ever before, there are new advanced techniques and technologies

Marine Equipment

Viking Bags Charter Deal for AHTS Brage Viking

Viking Supply Ships has entered into a contract with an Oil major for the charter of “Brage Viking” commencing 1stof April 2015. The duration is for 2 years and 8 months firm,

SimCity

Building Capacity, as Deadline for Trained Crews Nears   “You see that ship. That’s our ship,” says Karsten Saevik, as he directs our attention to the virtual

Schmiedag and Wildauer Schmiedewerke: 'We Forge Partnerships'

Olaf Wiertz, Sales Director at Schmiedag GmbH (SDG) and Wildauer Schmiedewerke GmbH & Co. KG (WSW) said: “We are more than just a supplier to our customers – we are their partner.

Marine Science

Changes in Aker Solutions' Top Deck

Tore Sjursen will assume the position as executive vice president for operational improvement and risk management at Aker Solutions on April 1. Knut Sandvik

Salvage, Wreck Removal Beset with Chronic Problems

The basic nature of maritime casualties, salvage and wreck removal has evolved rapidly over the last few years. Ships and offshore constructions have become more technologically elaborate,

Moskito to Recover Oil from Sunken Wrecks

A tool for removing oil in submerged vessels was developed in Norway by Miko Marine. Moskito is designed to address the pollution threat that exists with the

Surveyors

TDDCL Seeks Input for New Repair Yard

Trinidad Dry Dock Company to develop new ship repair yard at Port of Spain; company requests Expressions of Interest for Environmental Impact Assessment and Geotechnical

Virtual Aids to Navigation Mark Research Equipment

Vesper Marine will provide its Virtual Aid to Navigation technology to the French company CGG, a  geoscience company that provides geological and geophysical survey

US-built Survey Vessel Delivered to Fugro

Newbuild shallow draft survey vessel Fugro Americas was delivered to Fugro on March 18, 2015. Built by Thoma-Sea Marine Constructors in Louisiana, with supervision by Fugro Marine Services Custom,

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Maritime Standards Navigation Offshore Oil Pipelines Ship Electronics Shipbuilding / Vessel Construction Sonar
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.3214 sec (3 req/sec)