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.
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_GS.exe
v1.0.6.4
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
