Reson 7111 Multibeam Echosounder System

Science Center Objects

The Teledyne Reson 7111 is a multibeam echosounder system that produces bathymetry, or depth, data in deep water.

Close-up view of an instrument mounted on a boat at a dock with other boats in the background.

Reson 7111 multibeam echosounder system

The Reson 7111 multibeam is a bathymetric survey tool ideally suited for water depths from 50m to 600m. The multibeam consists of a 150°-wide, across-track swath with beams every 1.5° (101, 201 high-density, equiangular, or 301 equidistant beams) that are 1.9° wide along-track. Beam spacing is selectable by the operator to provide uniform sounding density and to maximize usable data at the outer reaches of the swath. The maximum data rate is 20 Hz but is primarily depth-dependent (i.e., deeper depths acquire less data).  The hydrophone and beam projector are mounted on a pole over the side of the vessel. While no direct tool is available for backscatter data, a tool called “Snippets” is provided to help determine surface roughness. Data is output over a Gigabit ethernet cable to the data acquisition computer.

Specifications

  • Manufacturer: Teledyne Reson
  • Model: 7111
  • Weight: Hydrophone, Projector and 25m of cable = 160 lbs
  • Weight: Transceiver = 70 lbs
  • Dimensions:
    • Hydrophone: 25” Dia x 5” long
    • Projector: 4.5” Dia x 26” long
    • Transceiver: 10.5” x 19” x 20”
  • Power Requirements: 110 VAC
  • Frequency of Operation: 100 kHz

Operational Characteristics

  • Minimum Operational Depth Range: 3m
  • Maximum Operational Depth Range: 750m
  • Sediment Type: Any, though hard bottom surfaces provide better results at long range
  • Limitations: Excessive vessel motion, number of GPS signals available, water debris (e.g., wake bubbles, kelp beds, turbidity flows, etc.), accuracy of measurements relative to the Inertial Measurement Unit (IMU), or vessel speed above 6 or 7 knots can reduce data quality/resolution (depth- and vessel-dependent).
  • Power Outputs / Frequency Ranges:   < 200 db @1m / 100k Hz
  • Ship’s Requirements
    • Pole (approx. 6” dia by 10’) mounted deployment and retrieval system
    • Davit for SWL of 50lbs, and capstan for retrieval of SVP
    • Minimal exterior deck space required, storage for line bucket and SVP
    • Internal space must accommodate 2 half racks and two video monitors, and have 110 VAC
    • Interior space must be within 25m of the transducer head to accommodate cable length.
    • Must be able to line follow at speeds around 5 knots, also hold station while taking sound velocity profiles.
Scientist leaning over side of R/V Alaskan Gyre adjusting the multibeam arm

PCMSC research geophysicist leans over side of R/V Alaskan Gyre adjusting the multibeam arm. Photo credit: Peter Haeussler, USGS

Additional Equipment required

  • Navigational Inertial Measurement Unit (IMU) such as Appalanix’s POS MV OceanMaster (wet pod) or POS MV Elite (vessel-mounted) and associated antennas, and PC for interface and data management
  • Data Acquisition computer running software such as PDS2000.
  • Sound velocity sensor at transducer mounting head (example: AML Oceanographic’s sound velocity sensor Micro SV)
  • Sound velocity profiler (examples are Xylem’s Castaway or AML’s SVP) and method of deployment retrieval
  • Navigational system for relaying information to vessel’s helm station (example either a real time display of bathyswath data, YoNav with preset lines, or Hypack).

Complementary Systems

None per se. Other systems can run concurrently with the multibeam as long as there is no signal interference between systems.