Innomar SES-2000 towfish — Towed Sub-Bottom Profiler

The Innomar SES-2000 towfish model performs like a Innomar SES-2000 standard SBP, but is towed to maintain an optimal distance to the seabed for highest resolution and detection probabilty of buried objects like pipelines and cables. This model is depth rated up to 600 meters. The high ping rate, a small footprint and the possibility of transmitting sound pulses over a wide frequency range ensure echoprints with excellent resolution and very good sediment penetration. Electronic beam stabilization along track (pitch) is used to compensate any towfish tilt.

Innomar SES-2000 towfish SBP

A user-friendly Windows data acquisition and system control software (SESWIN) is used for remote (Ethernet) operation. The Innomar SES-2000 towfish model acquires full-waveform data that can be processed with any seismic software (SEG-Y format). Innomar also provides the ISE post-processing software specialized on the Innomar SES-2000 SBP data.


Technical Specification

Depth rating 1 – 600 m below water level
Range below transducer 1 – 500 m (depending on sediment type and noise)
Sediment penetration up to 50 m
Range / Layer resolution approx. 1 cm / up to 5 cm
Transmit beam width (-3dB) approx. ±2° / footprint <7% of altitude
Primary frequencies (PF) approx. 100 kHz (frequency band 85 – 115 kHz)
Primary source level >240 dB//µPa re 1m
Secondary low frequencies (SLF) centre freq. user selectable: 4, 5, 6, 8, 10, 12, 15 kHz
SLF total frequency band 2 – 22 kHz
Pulse type Ricker, CW, LFM chirp
Pulse width user selectable 0.07 – 1.5 ms
Ping rate up to 40 pings/s
Tow speed max. 6 knots
Altitude change max. 2 m/s
Towfish L 2.15m × W 0.95m × H 0.65m / weight 52 kg in air
Transceiver (subsea housing) L 0.75m × ∅0.3m / weight 49 kg in air (water: 7 kg)
Transducer L 0.26m × W 0.23m × H 0.16m / weight 18 kg in air
Integrated sensors heave, roll, pitch, altitude, depth below surface
Heave / Roll / Pitch compensation heave, pitch
Topside unit PC for control and data acquisition;
power supply and data modem (Ethernet)
Data link Ethernet
Tow cable Coax (e.g. Rochester A320327)
Data acquisition digital 16 bit @ ~70 kHz sample rate;
PF 100 kHz envelope echosounder data / bottom track;
SLF full-waveform sub-bottom data
Auxiliary Input GNSS
Auxiliary Output bottom track, attitude data
Power Supply 100–240 V AC / <250 W


Included Features

  • Pitch beam stabilization
  • SLF full waveform data acquisition (sub-bottom data)
  • Multi-ping mode for maintaining a high pulse rate in deep waters
  • Multi-frequency signals
  • LFM chirp (full SLF bandwidth)



  • SESWIN data acquisition software
  • SES Convert data converter software (SES/RAW to SEG-Y, XTF, ASCII)
  • SES NetView for display of online echoprints and system information on remote computers (via Ethernet) for QC
  • ISE post-processing software incl. GIS module



Related Documents


Technical specifications are subject of change without notice.