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Optical VSF Sensors >
LISST-STOKES - for in situ depolarization studies
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LISST-STOKES
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The LISST-STOKES from Sequoia is the world’s first commercially
available submersible instrument for measuring the depolarization ratio in situ.
This is accomplished using two independently switched, linearly
polarized, fiber-coupled lasers. A 45° beam splitter divides the
scattered light in two paths; one part scatters onto a custom 32-angle ring detector
from where the VSF is obtained. The other part of the light passes
through an analyzer and is detected by a CCD array. From this
measurement the depolarization ratio is obtained.
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LISST-STOKES optics details
| | In addition to the depolarization ratio, the VSF is obtained at 2 wavelengths; red (658 nm) and green (532 nm). The angular range covered by the ring detector is 0.752 - 148 mrad IN WATER.
| | | | | | | | | | Although the LISST-STOKES is designed for use in situ and can be submerged to a
depth of 300 m, it can also be used in a laboratory setting for measuring discrete samples. The measurement frequency is one measurement every 27 seconds. For this reason, the LISST-STOKES is not suitable for continuous profiling applications, except in circumstances where the profiling is done in steps, holding the instrument at a constant depth for at least 27 seconds.
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Temperature and depth is included for each measurement. Also the beam attenuation at the two wavelengths is included with each measurement. Power is applied
externally, either via an external power cable or an external battery
pack (included).
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| | | | | | | | Data processing is performed using MATLAB scripts, which are supplied open-source and free of charge with the instrument to the user. No Windows software exists or will be supplied for the LISST-STOKES; the user MUST have MATLAB and be proficient in its use to process LISST-STOKES data.
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The first LISST-STOKES shipped in August 2010.
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Related Links
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Updated 2/16/2011
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|  | | LISST-SOP 5.0 Released |  | LISST-SOP 5.0 for LISST-100X and LISST-Deep released!
Features:
-Batch Processing
-Inversion of randomly shaped particles
-W7 compatible
-Command line batch processing
-Improved serial port communication
DOWNLOAD TODAY | |  | |  |  | 8th National Monitoring Conference
Portland, OR, 1-4 May 2012, booth 27
AOGS-AGU(WPGM) Joint Assembly
Singapore, 13-16 August 2012, booth A8
AEG 55th Annual Meeting
Salt Lake City, UT, 17-20 September 2012
Ocean Optics XXI
Glasgow, Scotland, 8-12 October 2012
PiE 2012
Barcelona, Spain, 17-19 October 2012
HYDRO 2012
Bilbao, Spain, 29-31 October 2012, booth 202 | | |
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