Attention:
The Doppler Log (DO Log) is part of nautical equipment. The operation belongs to the bridge only.
Summary
The Doppler log measures speed through water by using the Doppler effect of sound signal reflected from the seafloor or from suspended matter in the water column. Wärtsilä SAM 4682 transducer consists of a total of 3 hydro-acoustic elements of 270 kHz.
| Manufacturer | Wärtsila SAM Electronics |
|---|---|
| Model | SAM4682 |
| Serial No. | n/a |
| Type | acoustic doppler velocimeter |
| SENSOR-Link | ↪ |
Transducer Frequency
270 kHz
Contacts
| Name | Institution | Role |
|---|---|---|
| Reederei Briese | Briese Schiffahrts GmbH & Co. KG | Engineer In Charge |
Components
The system consists of a transducer with 3 hydro-acoustic elements installed in the ship's keel. It is operated from the bridge.
No subdevices available.
Position
| Info | xyz-position of transducer from Alignment Survey Report RV Heincke (January 2016). Electronics and operation on bridge deck. |
| X | 47.221 m (Positive X axis is forward and along the centerline of the vessel with X0 at the Stern point of the vessel. ) |
| Y | -0.017 m ( Positive Y axis is portside of centerline with Y0 at centerline at the Very stern point of the vessel. ) |
| Z | -0.074 m (Positive Z axis is upwards of basis. Z0 is set to the hydrophone on midship.) |
Data logging, storage and archiving
Logged parameters
| Parameter | Sensor Output Type | Unit |
|---|---|---|
| longitudinal ground speed | speed | knot |
| longitudinal water speed | speed | knot |
| transverse water speed | speed | knot |
| transverse ground speed | speed | knot |
Central geographical ship's position and time standard
Time synchronization and geographical positioning is done by DShip receiving the data for logging.
Rawdata storage on board
Data storage in DShip system.
DShip
Uncorrected measurement data.
Device name |
Dolog |
|---|---|
Parameters |
Dolog.VDVBW.Sentence; Longitudinal ground speed [kn]; Longitudinal water speed [kn]; Transverse ground speed [kn]; Transverse water speed [kn] |
Data archiving on land
After the cruise the DShip data set can be extracted from https://dship.awi.de/
.
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