Menu

Sequoia Scientific

News

Laser Diffraction Principles

April 2, 2017

This is a simple description. For detailed explanations see articles: Laser Diffraction-101 and -201. Particle Size Distribution  (PSD) is a multi-parameter description of how the total concentration of particles is distributed into many size fractions....

Read more...

Sequoia Presents New Idea on Turbine Abrasion Protection

September 27, 2016

Sequoia’s LISST-Infinite and LISST-Hydro products generate data on sediment concentrations in water entering turbines. However, there has been no guidance for plan operators on what levels are dangerous, or at what level the operator should shut down...

Read more...

Turbidity vs Laser Diffraction – why LD is better

April 29, 2016

Last updated: 11 May 2016  Turbidity as a surrogate for suspended sediment concentration (SSC) is commonly used and deeply established in practice. The shortcomings of turbidity as a surrogate for SSC are: The calibration changes with grain size; The...

Read more...

How LISST-Infinite Works

April 14, 2016

  LISST-Infinite installed next to a draft tube. Sequoia’s LISST-Infinite instrument is made to protect turbines by sounding alarms so that plant operators may decide to shut down power production and save turbines from abrasive damage. The...

Read more...

Laser Diffraction 201 – LISST

April 15, 2011

How LISST works! [Sequoia, April 15, 2011] 1. The Ring Detector 2. How Particle Sizes and Measurement Angles are Selected 3. Origin of the Matrix Formulation – It’s just algebra 4. Inversion of Data – the Information Content...

Read more...