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| Sensorweb integration |
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| urn | vessel:polarstern:simrad_ek80_ps |
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| contenttype | Summary |
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The sounder operates several frequencies simultaneously thus allowing to detect fish in different depths. |
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| Sensorweb integration |
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| urn | vessel:polarstern:simrad_ek80_ps |
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| contenttype | Metadata |
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| Manufacturer | Kongsberg |
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| Model | Simrad EK 80 |
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| Serial No. | n/a |
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Type | echo sounder | | SENSOR-Link | ↪ |
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Transducer Frequency:
| Metadata (Metadata Plugin) |
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18, 38, 70, 120, 200 kHz |
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| Sensorweb integration |
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| urn | vessel:polarstern:simrad_ek80_ps |
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| contenttype | Contacts |
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| | Name | Institution | Role |
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Sören Krägefsky | Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research | Engineer In Charge, Principal Investigator, Data Scientist |
| Alfred Wegener Institute for Polar and Marine Research | Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research | Owner |
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Components
| Metadata (Metadata Plugin) |
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The system consits of five "split beam" transducers (ES-18, ES-38B, ES-70-7C, ES-120-7C, ES-200-7C) located in the box keel, five General Purpose Transceivers (GPTs), two EK80 WBTs (45-90 kHz, 90-160 kHz) and a computer with installed data acquisition and processing software ER60 and EK80 in room A113. |
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| Sensorweb integration |
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| urn | vessel:polarstern:simrad_ek80_ps |
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| contenttype | Subdevices |
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| | Name | Model | Serial Number | SENSOR-
Link |
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| F120/200_kHz transducer | Simrad EK80 | n/a | ↪ |
F18_kHz transducer | Simrad EK80 | n/a | ↪ | | F38_kHz transducer | Simrad EK80 | n/a | ↪ |
| F70_kHz transducer | Simrad EK80 | n/a | ↪ |
| acoustic doppler current profiler and echo sounder | EC150-3C transducer | n/a | ↪ |
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Position
| Sensorweb integration |
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| urn | vessel:polarstern:simrad_ek80_ps |
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| contenttype | LocalFrame |
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| Info | xyz-position calculated from Alignment Survey Report RV Polarstern (2016), transducers located in box keel, electronics located in E525, computers located in A113 |
| X | 73.14 m
(X-0 is at the center of der rudder (ref. design drawing of the vessel), positive X-axis is forward and along vessel centerline) |
| Y | 0.022 m
(Y-0 at centerline, positive Y-axis is portside ) |
Z | 0.012 m
(Z-0 is set to the lowest point of the keel, positive Z-axis is upwards) |
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Data logging, storage and archiving
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| Sensorweb integration |
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| urn | vessel:polarstern:simrad_ek80_ps |
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| contenttype | Parameters |
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| Parameter | Sensor Output Type | Unit |
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| depth | depth | m |
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Central geographical ship's position and time standard
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| Metadata list |
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|| File format(s) | *.txt ||
|| Calibration certificates | NO || |
Calibration
The EK80 system must be calibrated. Ideally, the calibration is executed before and after the measurement in the working area. So, the calibration parameters can be defined dependent the actual water conditions. For this reason a calibration on previous cruises will not lead to optimal results.
The calibration is performed using three winch systems positioning the calibration sphere below the transducers.
The winch system as well as their control must operated by the scientists. The laboratory electronic engineer may assist the setup of the system.
A calibration must be planned like all other scrientific work prior the cruise, because the calibration work needs time. Ideally half a day is requested, but will take longer (may be a whole day), if weather conditions decrease.
Ideally the calibration is performed in calm sea without wind. If wind forces the drift of the ship, the winches will not hang vertical anymore but will also drift. Under this conditions it is very difficult, to move the calibration sphere to the requested locations.
Furthermore, the calibration must be planned, because calibration equipment is not permanently on board. The winches etc. need storage capacities and are stored during harbour visit in Bremerhaven, only.
If you are planning to execute a calibration, please add the that work in formula "Einsatzplanung" and step in contact with schiffskoord@awi.de for further planning.
Documentation
