Sequoia Scientific, Inc.

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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.

LISSTs and Primary Productivity!Primary Producers are the organisms that in general convert inorganic materials (e.g., p...
11/06/2026

LISSTs and Primary Productivity!

Primary Producers are the organisms that in general convert inorganic materials (e.g., phosphate) into organic matter (e.g. lipids) through photosynthesis. In the aquatic realm, the dominant primary producers are the phytoplankton. Primary Production relates to the amount of organic matter the Primary Producers build up over time, e.g. mg C / m3 / hr. Several methods exist to measure Primary Productivity: Adding radioactive tracers to a sample and measure the radioactive uptake after incubation; light-dark bottle technique comparing changes in dissolved oxygen; and various fluorescence techniques.

LISSTs cannot make any of these measurements. However, LISST data such as particle size distribution and concentration are still useful for certain aspects of primary productivity studies: learn more following this link: https://www.sequoiasci.com/article/lissts-and-primary-productivity/

Sequoia instruments measure IOP’s. What are they and why are they so critically important?IOP stands for ‘inherent optic...
11/06/2026

Sequoia instruments measure IOP’s.
What are they and why are they so critically important?

IOP stands for ‘inherent optical property’—‘inherent’ in that they depend only upon the medium, for example, seawater including the dissolved and suspended materials within it. Two fundamental IOPs are the absorption coefficient and the volume scattering function (VSF). A third IOP often considered in oceanography is the beam attenuation coefficient, which is the sum of the absorption and total scattering coefficients.

IOPs are independent of the ambient light field, for example, the position of the Sun; and are usually measured with ‘active’ sensors, meaning that they use a light source and detect how that light is affected by the medium. This independence allows IOPs to be measured across various platforms ranging from conventional moorings and marine vessels to remotely operated vehicles such as autonomous profilers and gliders.

IOPs provide a means to quantify characteristics of in-water constituents such as phytoplankton and sediments to better understand water quality. They also provide a critical connection between the characteristic components in the seawater and the signal seen by ocean color satellites. Sequoia currently empowers scientists worldwide with multiple instruments for measuring IOPs in support of water quality and ocean color research:

• LISST-200X and LISST-Deep Submersible Particle Size Analyzers measure beam attenuation in addition to particle size distribution
• LISST-Tau High-Precision Transmissometer
• Hyper-a Hyperspectral Absorption Instrument
• Hyper-bb Hyperspectral Backscatter Instrument
• Hyper-c Hyperspectral Attenuation & Transmission (under development)
• LISST-VSF Multi-Angle Polarized Light Scattering Instrument
• LISST-Horizon Flow-Through Automated Optical Scattering Measurement

Learn more here:
https://www.sequoiasci.com/product/optical-vsf-sensors/

mCDR what exactly is it?The acronym mCDR stands for “marine carbon dioxide removal” and defines the process of using oce...
11/05/2026

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/

Real-Time Size and Settling Velocity at depths down to 6,000 meters!The LISST-RTSSV measures sediment size, settling vel...
11/05/2026

Real-Time Size and Settling Velocity at depths down to 6,000 meters!
The LISST-RTSSV measures sediment size, settling velocity and concentration in real-time. Originally developed for deep-sea mining companies and regulatory agencies: providing baseline environmental data prior to mining operations, and subsequently underpinning environmental monitoring and modeling of these operations. The LISST-RTSSV is also applicable to widespread use within the offshore oil and gas industry, dredging industry, and sediment research. Learn more on this exciting product offering following the provided link: https://www.sequoiasci.com/product/lisst-rtssv/
Image shows the LISST-RTSSV, which can image particles from 3.6 to 4,200 microns

First Comparison of Sequoia Hyper-a vs. Sea-Bird ac-sRevealing recent measurements with Sequoia Scientific’s Hyper-a and...
11/04/2026

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/

Sequoia instruments are used in drilling operations worldwide! The technology is commonly used to accurately monitor s...
11/03/2026

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/

Address

2700 Richards Road, Ste 107
Bellevue, WA
98005

Opening Hours

Monday 9am - 5pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 5pm
Friday 9am - 5pm

Telephone

+14256410944

Website

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