Trawl Hydrophones
Scanmar’s trawl hydrophones are developed in close cooperation with more than a thousand of fishing vessels, and are specifically designed for trawler applications. The narrow vertical beam greatly improves the immunity to propeller noise, while the wide horizon-tal coverage simplifies operation.
A good hydrophone positioning is a key to a stable signal transfer between the sensor and the receiver; and there are several options here depending on the type of the vessel and purse seining. In general, a compromise is found between clear line of sight to the sensors, propeller noise, interference from other equipment and air bubbles under the hull.
For keeled vessels operating under difficult condi-tions, hydrophones can be mounted on the keel or in trunks specially produced for Scanmar.
In recent years it has become more common to install two sets of hydrophones (4 hydrophones in total- 2 in front and two back) on new vessels for full coverage. This is in order to optimize the signal reception in difficult cargo and/or catch conditions. Our hydrophones are available in two variants:
- Standard trawl hydrophone
- Standard trawl hydrophone with temperature sensor
- Hydrophone for Purse Seines
Under certain conditions, the temperature at the surface provides a good indication of the tempera ture profiles further down in the sea. By logging over time, this can give good estimates of the possible presence of fish.
