The person responsible for the research equipment: Peter Čerče, professional associate in humanities.
The sub-bottom sonar is used for deep and undamaging field overview of sediments on the seabed, lakebed or river bottom.
Manufacturer: Innomar Technologie GmbH
Model: SES-2000 Compact
The sonar is based on the principle of parametric acoustics, meaning that it produces a low frequency signal in the water space beneath it, which is penetrating the bottom (adjustable frequency from 4 kHz to 15 kHz), with a nonlinear addition of two high level frequencies (100-115 kHz), instead of it being generated by the probe itself. By using this technique, a considerably higher space resolution (small beam width: 1.8° (0.22 x 0.22) m2) and smaller probe dimensions are attained. In ideal conditions, this echo sounder is capable of detecting objects and layers up to 40 metres under the bottom surface. However, its actual penetration ability is highly dependent on types of upper layers and it seldom surpasses the depth of 20 metres.
SES-2000 Compact, transmitting and receiving unit
The probe i.e. transformer
Visualisation of the measurements of a seabed taken by a sub-surface sonar
- Compact and thus easily appliable on smaller vessels
- Uses parametric acoustics
- Includes a nonlinear transmitter and a linear receiver
- Primary frequency: 100 kHz
- Secondary frequencies: 4, 6, 8, 10, 12, 15 kHz
- Pulse width: 66 µSec - 500 µSec
- Pulse repetition rate: up to 30/sec depending on range
- Water depth range: 1 m - 400 m
- Sediment penetration deapth: up to 40 m depending on sediments and frequency
- Sampling resolution: > 1cm
- Accuracy: at 100 kHz : 0,02 m + 0,02 % of water depth; at 10 kHz : 0,04 m + 0,02 % of water depth
- Operating conditions: 115-230 V AC +5%/-10%, 50 - 60 Hz
- Power consumption: < 800 W
The purchase of the research equipment was co-financed by the Slovenian Research Agency.
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