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Laser In-Situ Scattering and Transmissometer (LISST)

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tieuminh2510

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Laser In-Situ Scattering and Transmissometer (LISST)

Bài gửi by tieuminh2510 on Tue Jun 24, 2008 3:58 pm


A Laser In-Situ Scattering and Transmissometer from Sequoia Instruments measures the size distribution of particles five to 250 microns in diameter. LISST is attached to POPS and generates diagrams of the size distribution of particles and small aggregates in the water column without disturbing them by collecting them in water bottles. Particles' sizes influence their optical properties and settling dynamics, but many of the aggregates fall apart in water bottles before they can be returned to the lab and measured.

To study smaller discrete particles we collect water samples and precisely measure the number and size of particles in the one- to thirty-micron size range with a Coulter counter. The Coulter counter pulls the water sample through a small hole in a tube through which an electrical current is also flowing. Particles in the sample decrease the current flowing through the hole by an amount proportional to their volume. Doctors use the same type of instrument to count your red blood cells.




Laser in-situ scattering and transmissometer (LISST) [16K]

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