Attention:
Please note that operations of the Fishnet Echo Sounders requires experienced scientific staff on board and can be only operated on request. The system is not operated by the ship's crew. Request operations with the Fishnet Echo Sounders to AWI-Logistics in sufficient time prior to the cruise and clarify the data transfer after the cruise.
Summary
The net echo sounders are used for information about the status of fishnets deployed in the water. Information about depth of the net, distance to seabed and amount of fish coming in are provided.
| Manufacturer | Scanmar |
|---|---|
| Model | HC4-TS150, H4-D150 |
| Serial No. | n/a |
| Type | echo sounder |
Transducer Frequency:
Contacts
| Name | Institution | Role |
|---|---|---|
| polarstern dship | Alfred-Wegener-Institute | dship connector |
Components
Position
| Origin Description: | no xyz-position given, Hydrophones are stored in E525, echo sounders are stored in climate room 5 / winch control station |
Data logging, storage and archiving
Logged parameters
No parameters found in sensor.awi.de.
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
- Trawl Sounder Datasheet (Factsheet, 218 kB)
- Scanmar Hydrophone datasheet (Factsheet, 207 kB)
- Scanmar Depthsounder datasheet (Factsheet, 113 kB)