Explorer AUV

UXO Trial
San Diego Bay

Explorer was integrated with the IVER2 AUV. The integration was tested by a third party at a blind UXO trial for the Geneva International Centre for Humanitarian Demining.

Figure 1: Magnetic maps –total field, before UXO seeding, and after UXO seeding; each “x” indicates unexploded ordnance detection.
Data courtesy of Geneva International Centre for Humanitarian Demining, Switzerland.

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

Overhauser sensors have high sensitivity, no dead zones or heading error, all of which make it orders of magnitude more accurate than any other magnetometer. These characteristics coupled with Iver’s great control of position, depth and altitude yielded exceptional quality data.

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UXO Trial
San Diego Bay

Explorer was integrated with the IVER2 AUV. The integration was tested by a third party at a blind UXO trial for the Geneva International Centre for Humanitarian Demining.

Figure 1: Magnetic maps –total field, before UXO seeding, and after UXO seeding; each “x” indicates unexploded ordnance detection.
Data courtesy of Geneva International Centre for Humanitarian Demining, Switzerland.

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

Overhauser sensors have high sensitivity, no dead zones or heading error, all of which make it orders of magnitude more accurate than any other magnetometer. These characteristics coupled with Iver’s great control of position, depth and altitude yielded exceptional quality data.

The neutrally buoyant Explorer AUV Mag comes with:

  • Explorer Towfish

    3 kg (8.5 lbs) in air

    1 kg (2.6 lbs) in water

  • BOB Software

  • Tow Cable

    125 g/m (0.084 lb/ft) in air

    44 g/m (0.029 lb/ft) in water

  • Power Supply

    227 g (0.5 lbs)

  • Case

    Empty Case: 20.9 kg (46 lbs)

    Shipping Weight: 32.8 kg (72.3 lbs)

Explorer AUV Includes

  • Overhauser sensor
  • Electronics module with Larmour counter
  • Leak detector
  • Depth rating 500m (728 psi)
  • Trim kit
Performance
Operating Zones NO RESTRICTIONS Explorer will perform exactly according to spec throughout the entire range
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 cm (33.75 in)
Diameter 6 cm (2.875 in)
Weight in Air 3.36 kg (7.4 lbs)
Weight in Water 3.9 g (0.14 oz)
Tow Cable
Conductors Four + Shield
Breaking Strength 998 kg (2,200 lbs)
Outer Diameter 0.7 cm (0.3 in)
Weight in Air 58 g/m (3.9 lb/100 ft)
Weight in Water 21 g/m (1.4 lb/100 ft)