Explorer v.AUV

UXO Trial
San Diego Bay

We tested integration of Explorer v.AUV with the Iver2 AUV at a blind UXO trial for the Geneva International Centre for Humanitarian Demining, Switzerland, in San Diego Bay.

Survey Parameters

  • Two 250m x 120m surveys were conducted over the same area.
  • One before seeding with simulated UXO targets, and the second after seeding, on the following day.
  • The targets ranged in size from 60 mm to 160 mm. The smallest target was 1 kg.

Results

The total-field map (figure 1) shows significant geological background obscuring small near-surface targets and a small pipeline in the lower half of the block. The unseeded and seeded area’s gradient map clearly show 10 UXO targets. It was confirmed that all ten UXO were reliably detected after seeding.

Gradient Data From A Single Explorer Sensor

Our specialized algorithms convert total field to total gradient data that:

  • improves target definition
  • suppresses background noise

and with Iver’s precise control of position:

  • yields unparalleled analysis

 

Get BOB Survey Software

Easily plan, configure, execute, and analyze your survey – free and native for all our magnetometers. Learn more

To discuss whether the Explorer v.AUV is the perfect fit for your application, please contact Gina Lopez:
gina.lopez@marinemagnetics.com
+1 (619) 655-0179

Call Us

UXO Trial
San Diego Bay

We tested integration of Explorer v.AUV with the Iver2 AUV at a blind UXO trial for the Geneva International Centre for Humanitarian Demining, Switzerland, in San Diego Bay.

Survey Parameters

  • Two 250m x 120m surveys were conducted over the same area.
  • One before seeding with simulated UXO targets, and the second after seeding, on the following day.
  • The targets ranged in size from 60 mm to 160 mm. The smallest target was 1 kg.

Results

The total-field map (figure 1) shows significant geological background obscuring small near-surface targets and a small pipeline in the lower half of the block. The unseeded and seeded area’s gradient map clearly show 10 UXO targets. It was confirmed that all ten UXO were reliably detected after seeding.

Gradient Data From A Single Explorer Sensor

Our specialized algorithms convert total field to total gradient data that:

  • improves target definition
  • suppresses background noise

and with Iver’s precise control of position:

  • yields unparalleled analysis

 

Get BOB Survey Software

Easily plan, configure, execute, and analyze your survey – free and native for all our magnetometers. Learn more

To discuss whether the Explorer v.AUV is the perfect fit for your application, please contact Gina Lopez:
gina.lopez@marinemagnetics.com
+1 (619) 655-0179

The neutrally buoyant Explorer AUV Mag comes with:

Explorer v.AUV Includes

  • Overhauser sensor
  • Electronics module with Larmour Counter
  • Leak detector
  • Depth rating 1000m (1420 psi)
  • Trim kit
  • BOB data acquisition and visualization software
  • Tow cable, length to be determined by integration
  • A custom shipping case
article

Teledyne Gavia integrates Marine Magnetics’ Explorer Magnetometer with the Gavia AUV

Source: Teledyne Marine

Underwater survey work is frequently carried out using autonomous underwater vehicles (AUVs). Magnetometers have always been a particular challenge to mount on AUVs, because of their strong magnetic signatures and strict power budgets, until now. Towing the Explorer AUV Magnetometer behind the AUV solves this challenge due to its small size, low drag and 2 watt power requirement. Teledyne Gavia and Marine Magnetics carried out a trial with the Gavia AUV towing the Explorer AUV Mag. This trial showed that the magnetometer can detect targets weighing as little as 1kg.

article

Using an AUV-Borne Magnetometer

Source: Doug Hrvoic, Marine Magnetics

Magnetometers have always been a particular challenge to mount on AUV’s, because of their strong magnetic signatures, until now. To solve the problem an AUV was needed whose magnetism was mild at best, and a magnetometer was needed that was free from dead zones, was small, low powered and free from heading errors and orientation restrictions. Together the Iver2 AUV and Explorer AUV magnetometer create the perfect combination.

article

Hrvoic 2014 Geophysical Survey using AUV with Magnetometer and Sidescan Sonar

Small, low cost Autonomous underwater vehicles (AUVs) provide ideal platforms for shallow water survey, as they are capable of unmanned navigation and can be programmed to acquire data at constant depth, or constant altitude above the seabed. AUVs can be deployed under most sea states and are unaffected by vessel motions that often degrade sonar and magnetometer data quality. The integration of sonar and magnetometer sensors on AUV’s is challenging, however, due to limited payload and strong magnetic fields produced by the vehicle motor. In this study, a Marine Magnetics Explorer Overhauser magnetometer was mated to a portable AUV (OceanServer Iver2) creating the first practical AUV-deployed magnetic survey system. To eliminate magnetic interference from the AUV, the magnetometer was tethered to the AUV with a 5 m tow cable, as determined by static and dynamic instrument testing. The results of the magnetic tests are presented, along with field data from a shallow water test area in Lake Ontario near Toronto, Canada. AUV-acquired magnetic survey data were compared directly with a conventional boat-towed magnetic survey of the same area. The AUV magnetic data were of superior quality despite being collected in rough weather conditions that would have made conventional survey impossible. The resulting high-resolution total magnetic intensity and analytic signal maps clearly identify several buried and surface ferrometallic targets that were verified in 500-kHz side-scan sonar imaging and visual inspection by divers.

Performance
Operating Zones Worldwide. Explorer collects accurate results regardless of how it’s pointed in relation to Earth’s magnetic field.
Absolute Accuracy 0.1 nT
Sensor Sensitivity 0.02 nT
Counter Sensitivity 0.001 nT
Resolution 0.001 nT
Dead Zone NONE
Temperature Drift NONE
Power Consumption 2 W
Range 18,000 nT to 120,000 nT
Gradient Tolerance Over 10,000 nT/m
Sampling Range 4 Hz – 0.1 Hz
Communications RS-232, 9600 bps
Power Supply 9-30 VDC or 100-240 VAC
Neutrally Buoyant Explorer Magnetometer
Length 86.5 cm (34 in)
Diameter 7.6 cm (3 in)
Weight in Air 3.7 kg (8.2 lbs)
Weight in Water <10 g (0.4 oz)
Neutrally Buoyant Tow Cable
Conductors Four + Shield + Floatation outer jacket
Breaking Strength 112 kg (250 lbs)
Outer Diameter 1.3 cm (0.51 in)
Weight in Air 139 g/m (9.3 lb/100 ft)
Min Bend Radius 140mm (5.5in)
Max Depth Rating 1000 m
Average Lengths 5 m - 10 m (depending on AUV size or application)