Sequoia Scientific, Inc.

Sequoia Scientific, Inc. Since 1995, Sequoia Scientific has been the world's only manufacturer of portable, field, and submersible laser particle sizers.

We research and manufacture instrumentation and software for scientific research and environmental monitoring.

Interested in learning about instrument developments and ongoing R&D at Sequoia? Check out the “Projects” page on our we...
09/04/2026

Interested in learning about instrument developments and ongoing R&D at Sequoia?

Check out the “Projects” page on our website! Learn all about Sequoia’s actively funded projects for developing new sensors and participating in field work, along with the history of our grant-funded R&D. Explore our publicly available datasets and learn more about recent presentations by our team at conferences throughout the world!

https://www.sequoiasci.com/projects/

Sequoia instruments are used in drilling operations worldwide! The technology is commonly used to accurately monitor s...
09/04/2026

Sequoia instruments are used in drilling operations worldwide!
The technology is commonly used to accurately monitor size changes to particles found in drilling fluids. The LISST-Portable|XR product allows analysis of particle size distribution and concentration data during the active drilling process, completed at the rig and often under rugged environmental conditions. Dependable real-time data is critical and allows operators to see anomalies in the distribution curve which may indicate a failure or alert them to take-action if a threshold is crossed.

Using industry proven laser diffraction secured inside an impact resistant enclosure, the LISST-Portable|XR allows operators to obtain lab quality data in the field, learn more here: https://www.sequoiasci.com/product/lisst-portable-xr/

Truly Portable Instrument Reduces Drilling Costs:
https://www.sequoiasci.com/article/the-smartphone-of-drill-mud-psd-measurements/

LISST-Portable|XR now with x100+ faster processing:
https://www.sequoiasci.com/about/news/lisst-portablexr-now-with-x100-faster-processing/

LISST-Portable|XR Comparison with Beckman Coulter, Cilas, and Malvern Particle Sizers:
https://www.sequoiasci.com/article/lisst-portablexr%e2%80%afcomparison-particle-sizers%e2%80%af/

mCDR what exactly is it?The acronym mCDR stands for marine carbon dioxide removal and defines the process of using ocean...
09/04/2026

mCDR what exactly is it?
The acronym mCDR stands for marine carbon dioxide removal and defines the process of using ocean-based methodologies to capture and store carbon dioxide (CO₂) from the atmosphere, with the aim to reduce global carbon levels.

Sequoia’s sensors can be used in the laboratory and field in support of different aspects of mCDR research. For example, in the context of ocean alkalinity enhancement (OAE) research, measurements of particle properties (size distribution, concentration, settling velocity) with our sensors can help scientists understand the dissolution, transport, and fate of alkaline material in the water. Additionally, measurements of in-water optical properties (hyperspectral absorption, hyperspectral backscattering) can support environmental monitoring efforts and help researchers understand the biogeochemistry impacts of different mCDR methodologies on the water environment.

The measurements provided by Sequoia’s sensors are critical to helping scientists and operators assess the safety and efficacy of different mCDR methodologies in different marine environments. Learn more by contacting Sequoia today!
Sequoia news link: https://www.sequoiasci.com/about/news/what-is-mcdr/

New publication out about the Hyper-bb! Published in Applied Optics, this new paper combines optical modeling, geometric...
09/03/2026

New publication out about the Hyper-bb!

Published in Applied Optics, this new paper combines optical modeling, geometric radiative simulations, and laboratory experiments to develop and validate an angular weighting function (AWF) that characterizes changes in the Hyper-bb response to different measurement and environmental variables.

Importantly, the study shows how the mean scattering angle of the sensor varies with wavelength and under different environmental conditions (salinity and temperature). The study also explores the impact of attenuation on backscattering measurements and includes an attenuation correction developed specifically for the Hyper-bb instrument.
Read the paper here: https://doi.org/10.1364/AO.603919
Learn more about the Hyper-bb here: https://www.sequoiasci.com/product/hyperbb/

OPTICAL SURVEILLANCE! In the underwater world, visibility is everything. Whether it’s a diver navigating murky waters, a...
09/03/2026

OPTICAL SURVEILLANCE!
In the underwater world, visibility is everything. Whether it’s a diver navigating murky waters, an autonomous vehicle scanning the seafloor, or a naval operation relying on optical sensors, understanding how light behaves underwater is critical. A simple and powerful measure for assessing underwater visibility is the beam attenuation coefficient (c), which is a measure of how much light is lost due to absorption and scattering as it travels through water.

Learn more about Beam Attenuation and how Sequoia instruments produce such measurements by following this link:
https://www.sequoiasci.com/article/optical-surveillance-beam-attenuation-in-naval-and-underwater-defense-applications/
Photo shows a glider mounted LISST-Tau (Image Credit: Garrett Miller, Teledyne Marine)

Sequoia at the 2026 Carbon to Sea Annual Convening! Kirby Simon, our Science and Technology Lead, attended the Carbon to...
09/03/2026

Sequoia at the 2026 Carbon to Sea Annual Convening!

Kirby Simon, our Science and Technology Lead, attended the Carbon to Sea convening in Halifax, Nova Scotia, Canada at the end of April. The convening brought together cross disciplinary leaders in the field of ocean alkalinity enhancement (OAE) research to update on progress across academia, industry, nonprofit, and other sectors in advancing this ocean-based climate solution.

Particle measurements are critical to understanding the fate of alkalinity in the water and potential environmental impacts from dosing, such as secondary precipitation. Sequioa’s sensors are therefore important tools in OAE laboratory studies and field work. This is evidenced by results from Kirby’s research where he used our LISST-200X to measure changes in particle size during alkaline mineral dissolution. See an example plot below showing the particle size distribution (PSD) of an alkaline feedstock change over time (~4 hours) when mixing with seawater!

Contact us if you want to learn more about Sequoia’s sensors and OAE, and for information about the conference find the link here https://www.sequoiasci.com/about/news/carbon-to-sea-convening/

First Comparison of Sequoia Hyper-a vs. Sea-Bird ac-sRevealing recent measurements with Sequoia Scientific’s Hyper-a and...
09/03/2026

First Comparison of Sequoia Hyper-a vs. Sea-Bird ac-s

Revealing recent measurements with Sequoia Scientific’s Hyper-a and Sea-Bird Scientific’s ac-s during a period of strong Noctiluca scintillans bioluminescence; the Hyper-a provides much higher spectral resolution, exhibiting narrow spectral features missed by the ac-s, and extending into the Ultraviolet range.

Both instruments capture the main absorption envelope, confirming consistent total pigment absorption and show overall shape agreement. However, the Hyper-a has a spectral resolution advantage: Its dual-spectrometer, hyperspectral system (~2 nm resolution) detects narrow pigment features that the ac-s (with ~4–10 nm spacing) does not resolve. Learn more about the innovative Hyper-a and produced datasets following this link: https://www.sequoiasci.com/about/news/hyper-a-vs-ac-s-datasets-revealed/

Progress update on the development of our new hyperspectral transmissometer (Hyper-c)! We have been hard at work develop...
09/02/2026

Progress update on the development of our new hyperspectral transmissometer (Hyper-c)!

We have been hard at work developing our newest sensor. The Hyper-c, funded by the NASA SBIR program, will measure hyperspectral transmission and beam attenuation with a target spectral range of ~360 nm to ~750 nm. Since being awarded a Phase II grant in August 2025, we have continued developing our laboratory breadboard and are on track to have our first submersible prototype completed by the end of the year.

Visit our website or get in touch to learn more!
https://www.sequoiasci.com/project/hyper-c-nasa-sbir-phase-ii/

Review our technical library today! Sequoia maintains an extensive library of technical papers where LISST & HYPER tech...
09/02/2026

Review our technical library today!

Sequoia maintains an extensive library of technical papers where LISST & HYPER technology is being applied. This valuable resource is maintained to inform other scientists, researchers, and technicians on how Sequoia instruments are exercised in science fields, academic study, and industry worldwide. Scan from hundreds of technical papers found in the Sequoia online library, and please let us know if a missing paper needs consideration

Follow link here:
https://www.sequoiasci.com/library/technical-papers/

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