Geophysical Instruments for Land, Sea and Air ­Subsurface Investigations

Geometrics, Inc.
Geometrics Inc., based in San Jose, CA, USA, designs and manufactures rugged, portable and technologically-innovative geophysical instruments for land, sea and air subsurface investigations. The company’s main product lines include high speed cesium magnetometers, exploration seismographs, digital marine streamers and electrical conductivity imaging and resistivity systems. Applications include natural resource exploration, geotechnical and environmental assessments, ordnance detection, surveillance, marine tectonic research, archeological and treasure survey, as well as teaching and research. Geometrics was founded in 1969 in Silicon Valley by Sheldon Breiner (PhD, geophysics, Stanford), and a handful of former employees of Varian Associates of Palo Alto. The company introduced... (read more)
2013-07-12 02:28:51

Hunting Shipwrecks Workshop

The Black Laser Learning's Hunting Shipwrecks seminar on 5th March in Boston, USA, gives participants an opportunity to find out how to find shipwrecks. Sport divers and amateur underwater archaeologists alike will get an in-depth overview on how to successfully locate shipwrecks using side scan sonar, magnetometers as well as the Hummingbird sonar. The workshop is part of the annual Boston Sea Rovers conference, taking place from 4th to 6th March 2011, the longest-running dive show in the US. This is Black Laser Learning's 2nd year giving this presentation. The workshop will start with sonar/magnetometer basics, then move through professional techniques.Topics... (read more)
2011-01-10 09:24:30

Super Sensitive Detector for Finding Shipwrecks

JW Fishers has released two state-of-the-art magnetometers, the Proton 4 boat-towed model and the Diver Mag 1, a hand-held unit carried by a diver. Both magnetometers have visual and audio readouts. The Proton 4 features an easy-to-read LCD display that is backlit for night operations and an audio alarm to alert the operator when a target is encountered. The Diver Mag 1 has an LED display for easy underwater viewing and a waterproof earphone that lets the diver know a target is being detected. Both devices employ a unique triaxial noise-cancelling sensor which allows the mag to move in any... (read more)
2004-09-13 12:00:00

Sub-bottom Object Detection

An Update on the Main Innovations of the Past Years
While nautical charting mainly focuses on bathymetry and objects that form a hazard to shipping, offshore construction and dredging require sub-bottom information. There is nothing worse in any project than finding wrecks or unexploded ordnance (UXO) after construction has started. The detection of covered cables and pipelines is also an important survey objective. There have been some interesting innovations in this field over the past years and, while this article does not attempt to be exhaustive, it provides an overview of the various types of system available. The Sub-bottom Profiler The classic instrument for detecting bottom layers and sub-bottom objects... (read more)
2020-12-11 11:34:08

Australian Navy Buys Magnetometers

The Australian Navy is the latest military unit to purchase JW Fishers Proton 4 magnetometers. The Aussies join a long list of military clients using Fishers underwater search equipment including the US Navy, the Italian Navy, the Egyptian Navy, Argentina’s Perfectura Naval, and Israeli military units. The Proton 4 is a sensitive metal detector that will find ferrous metal objects laying on, or buried under, the seafloor. This rugged instrument can detect large shipwrecks more than a quarter of mile away. Even targets like ship’s anchors can be detected at a range of 30m or more. The military use magnetometers... (read more)
2006-08-22 12:00:00

Marine Industry Employs Boat-towed Detectors

Many marine service companies are acquiring boat-towed metal detectors and magnetometers to assist in salvage operations and geophysical surveys. These devices can locate a variety of targets including sunken vessels, ship anchors and propellers, pipelines, cables and metal debris which must be removed from an area before dredging. The two primary pieces of equipment used in these operations are a magnetometer and the pulse induction (PI) metal detector. Magnetometers are sensitive instruments that can detect iron and steel objects at hundreds of feet away. The boat-towed PI detectors locate all types of metals, while ignoring the high mineralisation in the... (read more)
2013-05-07 04:44:30

Impact Subsea Launches ISM3D AHRS

Impact Subsea has announced the launch of a groundbreaking underwater Attitude & Heading Reference System - the ISM3D. It utilises high-grade MEMS-based accelerometers, angular rate gyroscopes and magnetometers that feed into a fusion engine driven by a dual-core micro-processor. The unit provides heading to ±0.5° of local magnetic north with pitch and roll to ±0.05° accuracy. For optimal performance, a hard and soft iron calibration can be performed on the unit once installed on the ROV, AUV or other underwater platform. This ensures that a consistently accurate heading is provided at all times. In areas where a large amount of steel... (read more)
2017-03-07 02:55:36

Operation Gooseberry Surveyed and Mapped

The entire QPS/IVS 3D suite of software products will be used during Operation Gooseberry (the survey of the British and Canadian D-Day beaches). QPS QINSy hydrographic software will be used for the collection of the survey data from the multibeam system and the magnetometer. Geo-spatial data processing will then be performed by IVS 3D Fledermaus software on the bathymetry data.     Fledermaus will also be used to process the multibeam backscatter data,  for processing the water column data (which will be collected over the wrecks) and to overlay the magnetometer data onto the bathymetry to aid in the search... (read more)
2011-09-12 12:00:00

Texas A&M University’s Nautical Archaeology Programme Teaches HYPACK

As part of HYPACK’s academic initiative to promote and encourage training and education, the company was involved in the Remote Sensing Survey Workshop 2014 which is part of Nautical Archaeology Programme at Texas A&M University. Several graduate students from the Nautical Archaeology Programme, and undergraduate students from Texas A&M Galveston, USA, attended the seminar and were able to gain experience in HYPACK for their study. After learning vessel safety and boat operations the undergraduates were able to focus on learning HYPACK. Each student was able to successfully learn how to configure HYPACK with a single frequency sidescan sonar, a magnetometer,... (read more)
2014-07-03 08:58:27

Tiburon Subsea Takes Delivery of OceanServer AUV Rental System

Tiburon Subsea has taken delivery of an OceanServer IVER3-580 autonomous underwater vehicle (AUV). This is the first of multiple vehicles being offered for rent to third-party operators. Tiburon Subsea is implementing extensive vehicle-specific AUV training programmes and offering full operator support services with all its AUV rentals. By certifying qualified operators from established companies, Tiburon Subsea is enabling these companies to access the latest technology and to utilise their own qualified personnel in the process. Tim Taylor, CEO of Tiburon Subsea, expects the survey AUVs to offer cost and time-effective methods to obtain superior data for small and large scale... (read more)
2014-11-12 09:00:28
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