The USGS has evaluated Sequoia’s LISST-ABS at 10 streamflow-gaging stations, collecting LISST-ABS and suspended sediment concentration (SSC) data between January 2016 and February 2018. The evaluation also compared the LISST-ABS to standard turbidity sensors normally used by the USGS. The results...
NOAA, The National Oceanic and Atmospheric Administration was founded in 1970 and thus celebrates its 50th anniversary in 2020. Learn more about NOAA and its story in this almost 200-page anniversary book. As a proud sponsor of the book, you can read it on Sequoia’s website below. See our ad on p....
The LISST-200X can be used in profiling applications, check out the specifics in this video! https://www.sequoiasci.com/wp-content/uploads/2020/09/LISST-200X_V5.mp4
Earlier this month, Sequoia sent out a survey to our LISST-ABS users to get feedback on how we can continue to improve this instrument. Survey participants were entered into a drawing for $200. Our winner was Cindy Crane from the Prince Edward Island (PEI) Department of Environment, Water and Climate...
In 2008, Sequoia Scientific’s Dr. Ole Mikkelsen co-authored and published a paper: The Influence of Schlieren on In-situ Optical Measurements Used for Particle Characterization. This paper was based on data collected during his postdoctoral work in Canada and the UK between 2002 and 2007. It was...
24th July 2020 In the last several years, Sequoia has introduced a range of new or upgraded instruments: LISST-200X, LISST-SL2, LISST-Holo2, LISST-ABS, LISST-AOBS, LISST-HAB, LISST-Black, LISST-Glider, Hyper-bb and LISST Horizon. Such an expansion increases inventory cost, documentation requirements,...
Sequoia’s LISST-200X has been designed to cover a wide range of particle concentrations. However, at high concentrations the light scattering from the particles can include multiple scattering. This will affect the measurement of particle size and concentration. The concentration where multiple...
January’s featured paper is here! Lepage H, Masson M, Delanghe D, Le Bescond C (2019): Grain Size Analyzers: Results of an Intercomparison Study. SN Applied Sciences (2019) 1:1100 | Tl;dr: No instrument in particular stood out as better or worse. But you probably shouldn’t compare...
As reports over the last 3-4 decades demonstrate increasing plastic concentration in the oceans, public and regulatory concerns have grown in parallel. Sequoia Scientific Inc. and other instrument manufactures are thus frequently contacted by scientists and regulators seeking tools that measure...
The short explanation Briefly, the difference between turbidity and Super-Turbidity (Patent Pending) can be summarized as follows: Turbidity (NTU) = Optical Backscatter; Needs Calibration for SSC; less accurate Super-Turbidity (mg/l) = Optical & Acoustic Backscatter; No Calibration for SSC; more...