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Sequoia Scientific

LISST-Glider

Particle Size Analyzer for Gliders

The LISST-Glider is a version of the LISST-200X designed for glider integration.

The LISST-Glider has the same specifications and performance as the LISST-200X particle size analyzer: measuring particle size distribution, concentration, beam attenuation, volume scattering function and other auxiliary parameters. The LISST-Glider is available in a version for Teledyne Webb Research’s SLOCUM G2 and G3 gliders and another for Kongsberg’s Seaglider C2 . The LISST-Glider must be purchased from either Teledyne Webb Research or Kongsberg Underwater Technology.

Please contact us for more information about integration with other gliders and underwater vehicles.

Features

The LISST-Glider is a submersible laser-diffraction based particle size analyzer designed to enable gliders to measure particle size, concentration, beam attenuation and volume scattering function.

Applications include sediment transport studies, harmful algae blooms, oil spill dispersion effectiveness, dredge plume monitoring, optical studies etc.

Like the LISST-200X, the LISST-Glider measures particle size and concentration of particles from 1 to 500 microns in 36 size classes at up to 1 Hz to depths of 600 meters. Data is stored on-board the instrument in a file compatible with standard LISST-200X processing software. Summary information, such as the particle Mean Size, Total Concentration and Beam Attenuation is output to the glider for possible transmission to the glider operators via satellite uplink.

LISST-Glider integrated on the SLOCUM glider and deployed by Rutgers University.

LISST-Glider Rutgers deployment

 

The LISST-Glider was first developed in 2016 through a project with Rutgers University who received DURIP funding from the US Office of Naval Research. Ten LISST-Gliders for the Teledyne Webb Research Slocum G2 Glider were delivered to Rutgers in early 2017 and have been deployed around the world for various applications. One of the first deployments of the LISST-Glider was off the coast of New Jersey in September 2017 ahead of Hurricane Jose. It was able to provide real time particle size and concentration data during the storm period that could not be safely measured previously.

LISST-Glider mounted on Kongsberg's Seaglider C2

LISST-Glider mounted on Kongsberg’s Seaglider C2

For more information, contact Teledyne Webb Research, Kongsberg Underwater Technology or Sequoia.

 

 

 

Specifications

Technology

  • Small-angle forward scattering
  • 32-ring custom photodiode Ring Detector + 4 large angle detectors
  • 25 mm optical path

 

Parameters measured

  • Particle Size Distribution from 1.0-500µm in 36 size ranges
  • Depth (600 m max depth)
  • Optical transmission @ 0.1% resolution
  • Volume Concentration @ 0.1µl/l resolution
  • Volume Scattering Function from 0.039 to 13.8 degrees in water
  • Output of Mean Size and Volume Concentration to internal Glider control system

Operating Concentration range

  • Optical transmission from 0.3-0.99 (30-99%)
  • Concentration from ~ 0.5-700 mg/l (grain-size dependent)

 

Mechanical and electrical

  • 600 meter depth rating
  • External power input: 12VDC nominal, 8-24VDC
  • Sampling rate: Up to 1 Hz
  • Current drain at 12V: 100mA Sampling, 8 mA between samples
  • Data storage: 1 GB (~12,500,000 size distributions)

Software & Downloads

Accessories

FAQ

I am interested in a quote for the LISST-Glider. Who should I contact?

Sequoia does not sell the LISST-Glider packages direct to the end-user: The LISST-Glider for the Teledyne Webb Research Slocum G2/G3 glider is being sold through Teledyne Webb Research while the LISST-Glider for Kongsberg’s C2 glider is sold through Kongsberg Underwater Technology.

You can contact them directly using the links above or send your contact information to us and we will be happy to forward it on to them.

I am interested in adding a LISST-Glider to my glider. What are the basic requirments for the integration?

The LISST-Glider uses many of the same components as the LISST-200X. The pressure case of the LISST-200X is replaced by the body of the glider. Therefore, the payload bay needs to be water tight and not a flooded compartment. The LISST-Glider is inserted into a hole in the side of the glider body that is 3.375″ (85.7 mm) in diameter and needs enough thickness for a radial o-ring seal. Typical minimum diameter is about 9″ (229 mm). Feel free to contact us for more specific information.