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

People & Company News

British Queen to Name New Ship

Queen Elizabeth II will christen P&O Cruises’ new flagship Britannia in Southampton, England, on March 10. She will be accompanied by her husband, Prince Philip, the Duke of Edinburgh.

Zamakona Yards' Commitment to Well-being

Recently employees of Zamakona Yards participated in a training course for maintaining Health, Safety and Environment (HSE). The theoretical practice focused on working at heights,

GasLog Post 4Q 2014 Results

GasLog Ltd. and its subsidiaries an international owner, operator and manager of liquefied natural gas carriers, today reported its unaudited financial results for the quarter ended December 31,

Technology

China's Maritime Advances Worry US

The Director of U.S. National Intelligence, James Clapper, has expressed his concern at the progress of China in maritime zones it shares with its neighbors, accused

Davie Building LNG-powered Ferries

Canadian shipbuilder Davie held a keel laying ceremony for MV Armand-Imbeau II, marking the beginning of the hull assembly for this first of two sisterships under

Keppel FELS to Deliver 100th Jackup Rig

Keppel FELS, a wholly owned subsidiary of Keppel Offshore & Marine (Keppel O&M) is on track to deliver PV Drilling VI, a KFELS B Class jackup rig, to PV Drilling Overseas (PVDO),

Marine Equipment

More Floating Accommodation for Lerwick

An accommodation ship, the SNAV Toscana is due at Lerwick on or around 6 March 2015 to supplement the floating accommodation at the port. Formerly operated as an Italian ferry,

VLCCF - 4Q & FY 2014 Results

Knightsbridge Shipping Limited ( VLCCF ) reports net income of $5.2 million and earnings per share of $0.06 for the fourth quarter compared with a net loss of $6.

“Jag Arjun” Delivered to Buyers

The Great Eastern Shipping Company Ltd. (G E Shipping) delivered its 1996-built Capesize Dry Bulk Carrier “Jag Arjun” (164,796 dwt) to the buyers on 26th February, 2015.

Marine Science

Satellite Images Reveal Ocean Acidification

Ocean acidification can now be seen from space, highlighting an ongoing danger of climate change and revealing the regions most at risk.   Pioneering techniques

Dredging Project to Protect Virginia Shoreline

Outer Continental Shelf sand will protect infrastructure, restore dunes and habitat   The U.S. Bureau of Ocean Energy Management (BOEM) and Naval Air Station Oceana at Dam Neck,

ST Engineering Y-O-Y Profits Slip

Singapore Technologies Engineering Ltd  reported today its full year financial results ended 31 December 2014 (FY2014) with a Group revenue of $6.54b compared to $6.

Surveyors

ClassNK Updates Guidelines for Floating Offshore Facilities

ClassNK released a new version of its Guidelines for Floating Offshore Facilities for LNG/LPG Production, Storage, Offloading and Regasification.   Available on the ClassNK website,

Egypt Bullish on New Suez Canal expansion

The Egyptian government is pressing ahead with the first major expansion of the canal in almost 150 years, to allow ships to pass north and south concurrently, reports Telegraph.

Norway-India Partnership in Polar Research

India and Norway closer to one another in questions related to Polar Research and a new proposal for polar research co-operation is on the anvil, reports Press Trust of India.

 
 
Maritime Careers / Shipboard Positions Naval Architecture Navigation Pipelines Port Authority Salvage Ship Electronics Ship Repair Ship Simulators Winch
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: 0.3517 sec (3 req/sec)