881A-GS

GYRO STABILIZED MULTI-FREQUENCY IMAGING SONAR

Gyro-stabilization of the Imagenex Model 881A-GS makes the high resolution 881A sonar into a system capable of crystal clear visualization of the ocean environment from moving platforms, no longer compromised by the blurring effects of host vehicle rotation. An advanced, low drift gyro is integrated directly into the sonar head, so the sonar can now compensate for vehicle motion in real time with unprecedented accuracy, stability, and robustness.

The enhanced capabilities of the 881A-GS have not compromised the performance of the 881A sonar. On short range, this sonar scans using a 2 mm range resolution, and can auto-adjust acoustic frequency and resolution to scan up to a 200 m radius, 360° surrounding area.

The Model 881A-GS still has low power, simple set-up, and small size that make it an ideal tool for large work ROV’s and small inspection vehicles. On it’s own it is now an amazingly simple drop sonar and borehole inspection package: just add a laptop computer and power supply and run the included Imagenex software.

881A-GS

Underwater Hardware Specifications

Frequency

310 kHz, 675 kHz, or 1 MHz (standard default settings)
-Other frequencies can be selected through programmable software configurations
(Tunable from 280 kHz to 1.1 MHz in 5 kHz steps)

Transducer

Imaging type, fluid compensated

Transducer Beam Width

310 kHz:  4° x 40°
675 kHz:  1.8° x 20°
1 MHz:  0.9° x 10°

Range Resolution

1 m - 4 m:  2 mm (0.08")
5 m & up:  10 mm (0.4")

Orientation Module (accuracies)

Pitch & Roll:  ± 0.1° typical
Heading (Magnetic):  ± 1.0° typical

Min. Detectable Range

150 mm (6")

Max. Operating Depth

1000 m and 3000 m available

Max. Cable Length

1000 m on typical twisted shielded pair (RS-485)

Interface

RS-485 serial interface @ 115.2 kbps (or optional RS-232)

Connector

Side mounted, four conductor, wet mateable (Subconn MCBH4M-AS)
Optional right angle or end mount connector

Power Supply

20 - 32 VDC at less than 7 Watts

Dimensions

(For Both depth ratings)
79.5 mm (3.13”) diameter x 245.7 mm (9.68”) length

Weight in Air

1000 m unit:  1.6 kg (3.5 lbs)
3000 m unit:  TBA

Weight in Water

1000 m unit:  TBA
3000 m unit:  TBA
 

Materials

1000 m unit:  6061-T6 Aluminum & Polyurethane
3000 m unit:  Titanium, Polyurethane & 300 series stainless steel                   

Finish

Hard Anodize

Software Specifications

Win881AL.exe

v1.0.2.8

Windows™ Operating System

Windows™ XP, Vista, 7, 8, 10

Modes

Sector, Polar and Side Scan

Gyro Modes

North Up, Heading Up, Target Steering

Range Scales

1 m, 2 m, 3 m, 4 m, 5 m, 10 m, 20 m, 30 m, 40 m, 50 m, 60 m, 80 m, 100 m, 150 m, 200 m

Train Angles

Continuous rotation, 3° increments

Sector Size

Sector Mode:  0° – 180°, 3° increments
Polar Mode:  0° – 357°, 3° increments, or Continuous rotation

Step Sizes

Slow (0.3°), Medium (0.6°), Fast (0.9°), Faster (1.2°), Fastest (2.4°)

Grid Types

Polar and rectangular

File Format

(filename).81R

Recommended Minimum Computer Requirements

2 GHz Pentium 4
256 MB RAM
20 GB Hard Disk
1024 x 768 Screen Resolution

Ordering Information

1000 m Unit

881-000-400

3000 m Unit

881-000-401

RS-232

Option               -006

End Mount Connector

Option               -009

Right Angle Connector

Option               -010

Gyro Stabilization

Option               -048

881A-GS

Features

  • Serial Communications
  • Programmable (format available)
  • Gyro stabilized transducer steering
  • Simple set-up and installation
  • Full scale range from 1 m to 200 m
  • Orientation module

Applications

  • ROV, AUV, & UUV
  • Manned Submersibles
  • Search & Recovery
  • Borehole/cave work
  • Drop sonar
  • Scientific Research

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