The 881a is a programmable multi frequency digital imaging sonar that you can operate using default frequency settings or customize the configuration for your own situation. High performance, lower cost, low power and simple setup and installation, make this sonar perfect for the largest ROV’s to the smallest inspection ROV’s, plus AUV or UUV applications

The Imagenex 881a small and simple

USING THE IMAGING SONAR ON AN ROV

The imaging sonar is a useful substitute for a positioning system on an ROV. Without an imaging sonar, an ROV relies on traveling underwater to bring new targets into view. With an imaging sonar, instead of traveling it is more useful to spend some time with the vehicle sitting on the bottom while the sonar scans the surrounding area. Scanning a large area takes only a short time, and the vehicle pilot can quickly assess the nature of the surrounding area. The ability to ”see” a long distance underwater allows the pilot to use natural or man-made features and targets as position references. 

Our Seabed Dredger with the Sonar Module mounted on the front frame

The combination of an imaging sonar and an ROV leads to fast and effective training in sonar interpretation. If the ROV pilot is searching for a particular object, recognition can take place directly from the sonar image. In other cases a number of potential targets may be seen. A pilot can sharpen his sonar interpretation skills by viewing these targets with the vehicle’s video camera and correctly identify them.

Applications:

• ROV, AUV and UUV

• Offshore Oil & Gas

• Sunken Timber recovery

• Profiling

• Diving support

• Surveying

• Search & Recovery

• Inspection

• Underwater Archaeology

• Scientific research

The 881a incorporates latest technological advances allowing multi-frequency capabilities from one compact digital sonar head.

Imagenex Windows 95, 98, NT compatible software controls, display, and records data from the 881a digital sonar head.

Sonar Image plotted on a laptop screen using the sonar head on a 3 meter sector scan of a sign at 1 MHz: Insert Photo of sign.

Specifications:

Frequency: Tunable . Three default settings of 310 kHz, 675 kHz and 1 MHz. Other frequencies can be selected through programmable software configurations.

Beam Width: 310 kHz, 4° x 40°, 675 kHz, 1,8° x 20° and 1 MHz, 0,9° x 10°

Transducer: Fluid filled protective transducer housing. 360° continuous rotating. Polar mode, sector mode, single sidescan mode.

Power supply: 20-36 VDC at less then 5 watt.

Interface: RS-485 at 115,2 Kbaud or optional RS-232

Cable length: 1000 m om typical twisted shielded pair

Operating depth: 1000 m and 3000 m available.

Connector: side mounted four conductor wet mateable connector.

Dimensions: 79,4 mm diameter x 181 mm length.

Weight: 1,5 kg in air and 0,6 kg in water