Submersible and Field Instruments for Measuring Particles and their Properties
Our instruments at 1. Grand Canyon USA, 2. Three Gorges Dam, China; 3. Venice lagoon; 4. Deepwater Horizon oil spill monitoring; 5. Japan Fukushima monitoring; and 6. Danube in Hungary.
Welcome to Sequoia Scientific, Inc.
In 1995, Sequoia Scientific, Inc. introduced the world’s first submersible commercial instruments for particle sizing based on laser diffraction. These LISST instrument systems are self-contained, compact, programmable, battery-powered, and they hold calibration for life. The brand name LISST derives from Laser In-situ Scattering and Transmissometry. Recently, instruments using holography and acoustic backscatter have been introduced under the LISST brand. These instruments are used for measuring particles, and for measuring optical properties of water. We offer a condensed view of the entire instrument line by application below. Still not sure? Please contact us.
Sediment and other Particle Sensors
For the Natural Marine-Aquatic Environment
LISST-Deep: Deep ocean use, measures PSD and concentration, similar to LISST-200X.
LISST-ST: Measures the settling velocity of particles binned into 8 size classes.
LISST-ABS: A high-frequency acoustic backscatter instrument for measuring particle concentration.
LISST-Portable|XR: World’s sole hand-portable particle PSD and concentration sensor.
LISST-HOLO: A submersible holographic camera. Records holograms for subsequent reconstruction of particle images, and to compute PSD and concentration.
Reservoir Siltation and River Sediment Transport
In addition to all of the above instruments, the following are specific for rivers:
LISST-SL Replacement for point-integrated or depth-integrated samplers. Profiles river columns for PSD, Concentration, Depth, Temperature, and velocity.
LISST-StreamSide A shore-mounted instrument for PSD and Concentration from a pumped stream.
Drill Mud Size Analysis for Oil and Gas industry
LISST-Portable|XR This instrument is most popular for on-site analysis of drilling muds.
Protection of Hydropower Turbines from Sediment Abrasion
LISST-Hydro Used to measure sediment PSD and Concentration when concentration is below a few 1000’s ppm. Generates alerts and warnings when hazardous conditions arise.
LISST-Infinite Automated dilution version of LISST-Hydro measures higher concentrations. Generates alerts and warnings when hazardous conditions arise.
Instruments for Marine Optics
LISST-200X Measures beam attenuation coefficient, and small-angle volume scattering function. (VSF)
LISST-VSF Measures beam-attenuation, VSF, and depolarization, P12 from 15 to 150o.
LISST-STOKES Measures beam-attenuation, small forward angle VSF, and depolarization, P12.
Radiative Transfer Software
We do particles. If you have a need, please surf the pages from here, or contact us.