News
May 1, 2015
Updated: 4 March 2016.
INTRODUCTION: Sequoia’s Acoustic Backscatter Sensor, LISST-ABS is designed to measure suspended sediment concentration at a point. Unlike ADCP’s which may record similar backscatter strength at multiple points (‘ranges’)...
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April 30, 2015
This Note shows how the calibration of the LISST-ABS acoustic backscatter sensor and of optical backscatter sensor (OBS) changes when water contains a broad distribution of particle sizes, and why LISST-ABS is inherently superior.
Particle size distributions...
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July 24, 2014
Scintillation is what makes stars twinkle. It is what causes mirage in deserts or on hot surfaces. It is what causes shimmer underwater in the vicinity of hot vents in oceans. These effects result from temperature fluctuations in air or water. The same...
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October 11, 2013
Is there a low velocity threshold for the LISST-SL? Does it need a minimum flow speed in order to sample? What is that?
Absolutely! The internal pump in the SL will adjust the intake velocity to match the ambient flow speed in order to make the sample...
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September 20, 2013
Sequoia makes laser diffraction and acoustic backscatter sensors for this application.
On-line monitoring of silt in hydro-power plants is a reality using Sequoia’s LISST-Infinite or LISST-Hydro instruments, designed specifically for this purpose....
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