Submersible and Field Instruments for Measuring Particles and their Properties
Welcome to Sequoia Scientific, Inc.
In 1995, Sequoia Scientific, Inc. introduced the world’s first submersible commercial instruments for particle intelligence (particle sizing, concentration, imagery and optical properties) based on laser diffraction – LISST. The brand name LISST derives from Laser In-situ Scattering and Transmissometry. LISST systems are self-contained, compact, programmable, battery-powered, and they hold calibration for life. Instruments using holography and acoustic backscatter have subsequently been introduced under the LISST brand. We offer a condensed view of the entire instrument line by typical industry/application below. Still not sure? Please contact us.
Marine applications (e.g. ocean science)
LISST-200X – Measures particle size distribution, particle concentration, small-angle volume scattering function, beam attenuation in situ.
LISST-Tau – our first dedicated transmissometer, for measurement of optical transmission and beam attenuation on CTD’s, floats, gliders, AUV’s, ROTV’s and other underwater systems.
LISST-Black – Integrated, self-contained instrumentation package designed for Oil Spill Response.
LISST-HAB – Stand-alone system designed for detecting and monitoring harmful algae blooms.
LISST-HOLO2 – A submersible holographic camera. Records holograms for subsequent reconstruction of particle images, and to compute PSD and concentration.
LISST-Horizon – Flow-through automated particle size and scattering measurement for onboard laboratory.
FlowControl – Allows for high-accuracy differential measurements of particle properties.
LISST-VSF – Measures beam-attenuation, VSF, and depolarization, P12 from 15 to 150o.
Hyper-bb – World’s First commercially available hyperspectral backscatter instrument.
LISST-STOKES – Measures beam-attenuation, small forward angle VSF, and depolarization, P12.
HYDROLIGHT and ECOLIGHT software products, which are de facto standard for computing light propagation in the sea via radiative transfer modeling.
Freshwater (e.g. River Sediment Transport)
LISST-SL2 – Replacement for point-integrated or depth-integrated samplers. Profiles river columns for PSD, Concentration, Depth, Temperature, and velocity.
LISST-ABS – A high-frequency acoustic backscatter instrument for measuring particle concentration.
LISST-AOBS – Patent Pending Super-Turbidity sensor for measuring suspended sediment concentration.
Energy applications (e.g. hydropower, oil & gas)
LISST-ABS – A high-frequency acoustic backscatter instrument for measuring particle concentration for turbine protection
LISST-Portable|XR – for measuring particle size distribution of drill-mud and brine on-site.
We do particle intelligence. If you have a need, please surf the pages from here, or contact us.