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Wärtsilä ELAC SeaBeam 3012 Full ocean depth multibeam system
12 kHz l 11,000 m depth performance l multi-ping l 31,000 m swath coverage l Swept Beam™ l WCI
Wärtsilä ELAC SeaBeam 3012 is a high-performance deep-water multibeam system, providing excellent real-time bathymetric data, bottom amplitudes, side scan data and beam data for water column imaging (WCI). Due to its depth performance, wide coverage and multi-ping operation, Wärtsilä ELAC SeaBeam 3012 is the ideal hydrographic sensor for full ocean depth surveys.
Wärtsilä ELAC SeaBeam 3012
System overview
Performance
Swept Beam™ transmission technique
Full ocean depth multibeam system Wärtsilä ELAC SeaBeam 3012 operates in the 12 kHz frequency band in water depths ranging from 50 metres below the transducers to 11,000 metres. It has a maximum across-ship coverage of more than 140 degrees and provides a maximum of 994 beams for each multi-ping. The data are fully stabilised for roll, pitch and yaw motion of the vessel. The depth accuracy of the sonar sensor exceeds the requirements of the International Hydrographic Organization (IHO) for depths greater than 100 metres.
higher maximum survey speeds without losing 100% bottom coverage. This is especially important for narrow along-ship beam widths. At a fixed survey speed, a doubled data density increases the target detection abilities.
High-density mode Wärtsilä ELAC SeaBeam 3012 has 602 beams in equiangular and multi-ping mode. The swath coverage can be decreased down to 60 degrees, leaving the number of reception beams constant.
Vessel track without stabilisation (a), with sector scan (b) and using Swept Beam™ (c)
Multi-ping mode In the multi-ping mode, Wärtsilä ELAC SeaBeam 3012 transmits and processes two swaths per ping cycle, allowing
Key features Up to 11,000 m full ocean depth performance
The projector array and the hydrophone array are arranged in a mills cross configuration. The projector array consists of up to 25 identical modules, depending on the along-ship beam width. Based upon customer requirements, specific beam widths like e.g. 1.5 degrees are possible. The projector modules utilise Tonpilz resonators. The hydrophone array consists of up to 15 identical modules, depending on the across-ship beam width. Based upon customer requirements, specific beam widths like e.g. 1.6 degrees are possible. The hydrophone modules utilise ceramic elements which have broadband performance to provide excellent phase uniformity across the array and multifrequency capability.
The receiver control unit has an Ethernet connection to the operator station.
Operator station The operator station is a PC of the latest technology, including an SSD for all software applications and a classical hard disc with very large storage capacity for measurement data. The operator station communicates with the sonar electronics via Ethernet, both for sonar control and acquisition of sonar data. The Wärtsilä ELAC HydroStar operator software provides all sonar control functions, records bathymetric data as well as WCI data and includes various real-time data displays for quality control. It also supports third-party software packages for data acquisition like HYPACK, EIVA or QINSy.
Water column imaging (WCI) WCI data can always be logged without any extra installation. In order to display real-time data from the water column and seafloor, an optional WCI station is required which receives data for each ping from the operator station via Ethernet. For water column imaging, the Wärtsilä ELAC HydroStar WCI client software is utilised.
Bottom slope data interface Wärtsilä ELAC SeaBeam 3012 provides a serial data output of bottom slope data. These data are calculated via linear regression and are e.g. useful for the automatic steering of a sub-bottom profiler.
Transmitter and receiver control units
Up to 31,000 m swath coverage Patented Swept Beam™ technology Multi-ping mode Real-time water column imaging (WCI) Modular design for different beam widths Hull-mounted hydrophone frame (flush installation)
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Wärtsilä ELAC SeaBeam 3012 applies the patented and unique Swept Beam™ transmission technique for artifact-free insonification and full stabilisation of the transmitted beams for vessel’s pitch, roll and yaw motion. For a series of pings, the Swept Beam™ swath footprints are evenly parallel lines on the seafloor without any discontinuities.
Transducer arrays
Full auto mode In order to secure a reliable and easy system operation, the Wärtsilä ELAC SeaBeam 3012 provides a full auto mode, enabling a successful quasiautonomous data acquisition. The full auto mode includes an automatic setting of all relevant system parameters.
Modular design for customised beam width solutions
The transmitter control unit supplies the drive signals to the entire projector array. Each output is separately controlled for power level, time delay, phase and frequency. This facilitates programmable shading and steering as well as transmit beam stabilisation using Swept Beam™ technology. The receiver control unit is responsible for the overall ping cycle. It contains the receiver circuits for the hydrophones as well as the signal processors for beamforming and bottom detection.
Wärtsilä ELAC SeaBeam 3012 – sonar electronics
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Technical data Input interfaces
Performance data Operating frequency
12 kHz band
Power
Min. depth
50 m below transducers
115 V / 60 Hz single-phase or 230 V / 50 Hz single-phase
Motion
RS232 / RS422
Max. depth
11,000 m (full ocean depth)
Heading
RS232 / RS422
Along-ship beam width
Position
RS232 / RS422
Surface sound velocity
RS232 / RS422
Swaths per ping cycle
1° / 2° (other beam widths available) 1° / 2° (other beam widths available) 1 (single-ping) or 2 (multi-ping – option)
Sound velocity profile
RS232 / RS422 / USB
Pulse lengths
2 - 20 ms
Across-ship beam width
Special output interfaces
Max. swath coverage sector > 140°
Centre depth interface
Full auto mode
Approx. 31,000 m (depending upon the ship’s own noise and sea state) Automatic setting of all relevant system parameters
Reception beam spacing
Equidistant or equiangular
Max. number of beams
994 (equidistant, multi-ping) 602 (equiangular, multi-ping)
Max. range sampling rate
2.5 kHz IQ (in-phase, quadrature)
Depth accuracy (sonar sensor)
In accordance with IHO SP44 for depths greater than 100 metres
Max. swath coverage
RS232, ASCII format
Bottom slope data interface RS232, similar to NMEA 0183 Stabilisation Roll
± 10°
Pitch
± 7°
Yaw
± 5°
Physical specifications Height (mm)
Width (mm)
Depth (mm)
Weight (kg)
Hydrophone array* 1° / 2°
222 / 222
892 / 952
7,756 / 4,316
2,136 / 1,200
Projector array* 1° / 2°
276 / 276
7,740 / 4,200
1,056 / 1,116
3,880 / 2,000
Hydrophone junction box
726
600
191
42
Projector junction box
395
640
130
20
Receiver control unit
1,952
606
958
390
Transmitter control unit
1,953
606
1,048
350 - 450
PC station(s)
177 (4 HE)
483 (19” rack)
505
14
* Dimensions may change due to special installation requirements. Please ask for dimensional drawings. The typical tolerance of weights is ± 10 %.
[email protected] www.wartsila.com WÄRTSILÄ® is a registered trademark. Copyright © 2016 Wärtsilä Corporation. Specifications are subject to change without prior notice.
09.2016 / Bock´s Office
Wärtsilä ELAC SeaBeam 3012 at a glance
