Survey

EdgeTech 3400-OTS: Pole-Mount Sub-Bottom Profiler

High-Resolution CHIRP Stratigraphy for Shallow and Deep Water Surveys

Product Overview 

The EdgeTech 3400-OTS (Over-The-Side) is a specialized pole-mount variant of the industry-leading 3400 Series sub-bottom profilers. Utilizing EdgeTech’s proprietary Full Spectrum® CHIRP technology, the 3400-OTS delivers high-resolution images of sub-bottom stratigraphy in oceans, lakes, and rivers. This over-the-side configuration is engineered for rapid mobilization on vessels of opportunity, providing a stable, fixed-geometry alternative to traditional towed systems.

The system features an advanced multi-channel PVDF hydrophone array and a choice of transducers tailored for various mission goals—from ultra-high resolution in shallow marshes to deep penetration in offshore wind farm sites. A standout feature is the "Pipeliner" mode, which optimizes the receiver array for the specific task of locating and imaging buried pipelines and cables.

Why Choose the EdgeTech 3400-OTS?

  • Calibration-Free Sediment Classification: Features real-time reflection coefficient measurements. This unique capability allows users to collect complex "analytic" data to measure sediment reflection and determine sediment type (e.g., sand, clay, silt) during the survey.
  • Dual Frequency Transmission: Capable of transmitting two discrete CHIRP pulses simultaneously, allowing the operator to optimize both penetration and resolution in a single pass.
  • Specialized Pipeline Mode: The segmented PVDF receiver array can be switched into a focused mode specifically designed to detect and track buried subsea assets with high precision.
  • Integrated Motion Compensation: Every 3400-OTS sonar head includes internal sensors for pitch, roll, heave, and depth, ensuring that data is corrected for vessel motion in real-time, even on small boats in choppy water.
  • Continuous High Ping Rate: Discrete transmit and receive channels allow for continuous data collection. This results in the high ping rates necessary for detailed construction and archaeological surveys where no gaps can be tolerated.

Specification3400-OTS Ultra-Light3400-OTS Light3400-OTS LF
Frequency Range4 – 24 kHz2 – 16 kHz1 – 10 kHz
Vertical Resolution4 – 8 cm6 – 10 cm10 – 30 cm
Penetration (Clay)40 m80 m200 m
Penetration (Sand)2 m6 m20 m
Transmitters112
Weight in Air21.4 kg27.2 kg145 kg
Topside Power200 W200 W4000 W (with Amp)
  • Versatile Configurations: Available in three versions: Ultra-Light (4–24 kHz), Light (2–16 kHz), and LF (1–10 kHz) to balance the need for resolution vs. penetration.
  • Digital Telemetry: The sonar head features a built-in digital receiver with Ethernet telemetry, reducing signal noise and allowing for long deck cable runs without data degradation.
  • Surface Echo Attenuation: Advanced algorithms significantly reduce the "surface multiple" interference common in shallow water surveys.
  • Pulse Library: Includes a tailored library of CHIRP pulses, allowing the operator to select the optimal frequency sweep for specific bottom types and survey depths.
  • Complete Software Suite: Supplied with EdgeTech’s DISCOVER acquisition software and fully compatible with major 3rd party processing packages like SonarWiz and HYPACK.
  • 1770430134_3400-OTS-102121.pdf

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