High-Resolution Imaging of Particles and Plankton The LISST-Holo2 uses digital holography to capture holograms of particles and plankton in water without disturbing the sample. Processing of the hologram (known as reconstruction) in the LISST-Holo2 software (included) results in three-dimensional images...
Measuring Particle Size Distribution in Natural Waters The LISST-200X measures the size distribution and concentration of suspended particles directly in water. Using laser diffraction, it measures how particles scatter light and inverts that scattering pattern into a particle size distribution and volume...
Sequoia Application Note SEQ-001-V1 Beam attenuation (c, [m-1]) is a critical inherent optical property (IOP) for oceanographers studying underwater visibility and suspended particles in the water column. Measuring beam attenuation in-situ requires transmissometers or attenuation meters, which employ...
PyOPIA (Python Ocean Particle Image Analysis) was introduced in 2023. It is an open-source Python library for combing through large amounts of particle image data collected by camera instruments such as LISST-Holo / LISST-Holo2, SilCam, UVP-6 and others. Using a standardized and user-customizable pipeline,...
You can integrate Sequoia’s LISST-Deep or LISST-200X onto a Sea-Bird CTD using the 6-pin auxiliary connector on the LISST connector endcap and a 2-m cable. This will power the instrument via the CTD and output two analog signals, one for mean particle size and one for total concentration for immediate...
There are several ocean science community-developed and supported software resources available for LISST and Hyper users interested in logging and/or processing data in other ways than supported by Sequoia’s standard software: PyOPIA PyOPIA is a Python-based ocean particle image analysis toolbox....
The Boycott effect refers to the substantial enhancement of particle sedimentation rates in settling columns that are inclined relative to gravity, compared to an otherwise identical vertical settling column. It was first observed experimentally by A. E. Boycott (1920) during studies of blood sedimentation,...
Measurements with Sequoia Scientific’s Hyper-a and Sea-Bird Scientific’s ac-s collected in East Sound, WA on May 20, 2024, during a period of strong Noctiluca scintillans bioluminescence The comparison is not strictly one-to-one, as the two instruments sampled slightly different water volumes. The...
Harmful algae. The phrasing itself almost seems it would be an oxymoron, like harmful carrots or something similar. But it is real: Given the right circumstances (light, nutrients), all algae can bloom and some of these can become Harmful Algae Blooms (HABs) if the algae can make toxins. It is most commonly...
A melting pot Researchers in oceanography come to the field from all sides: physicists, biologists, geologists, geographers, hydrologists, mathematicians and many more. As a result, there can be a confounding number of terms for the same thing. An example of this is how we name the various components...