Shallow Water Sub-Bottom Survey

Pinger Chirp Sub-bottom Profiler

Pinger, an innovative new product offering, is designed specifically for shallow water sub-bottom sediment profiling (as shallow as 4m and up to 300m in ideal conditions). It is intended for a simple over the side pole mount installation, and is not to be deployed as a towed fish.

The Pinger Wet End includes two separate interchangeable projectors - a low frequency 3.5 kHz. projector for hard packed sand bottoms, a 15 kHz. projector for soft mud sediments, and a broadband hydrophone receive array. A 200 kHz. transducer is also included which provides a reference point as to where the bottom begins.

The Pinger Dry End is a portable, black box system which plugs into the user's laptop computer via a usb cable connection. The system is controlled through Knudsen's SounderSuite Windows application software which is supplied with the unit. The user will be able to view depth records in real time, and record the data onto their computer hard drive for archival and post processing.

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The following links provide technical information, images and data samples obtained from Pinger. The sediment type and frequency used is detailed below.

Notes regarding data:

  1. Lake Champlain data was taken using the 15kHz projector. This is a glacial lake with soft sediment layering, ideal conditions for sub-bottom profiling.
  2. The St. Petersburg Data was taken using the 3.5kHz projector for a hard packed sand bottom.
  3. The Tampa Bay data was taken using both the 3.5kHz and 15kHz projectors for a sandy sea bottom.
  4. The Big Rideau data is using mostly the 15kHz projector which is ideal for the soft mud/silt bottom.