Sequoia Scientific

Product Overview

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 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 application below. Still not sure? Please contact us.

For the Natural Marine-Aquatic Environment

LISST-200X: Measures particle size distribution, particle concentration, beam attenuation in situ.
LISST-Deep: Similar to LISST-200X but rated to 3000m depth.
LISST-ABS: A high-frequency acoustic backscatter instrument for measuring particle concentration.
LISST-Portable|XR: A low-cost, hand-portable, ruggedized particle size analyzer.
LISST-HOLO2:  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 is specific for rivers:
LISST-SL2 Replacement for point-integrated or depth-integrated samplers. Profiles river columns for PSD, Concentration, Depth, Temperature, and velocity.

Protection of Hydropower Turbines from Sediment Abrasion

LISST-ABS A high-frequency acoustic backscatter instrument for measuring particle concentration.

Drill Mud Size Analysis for Oil and Gas industry

LISST-Portable|XR   This instrument is most popular for on-site analysis of drilling muds.

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

Our HYDROLIGHT and ECOLIGHTsoftware products are de facto standard for computing light propagation in the sea via radiative transfer modeling.

We do particle intelligence. If you have a need, please surf the pages from here, or contact us.