Sequoia LISST-HOLO, Руководство пользователя

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62 LISST-
HOLO User’s Guide
my PC?
NOT the PC.
What is the maximum
concentration that the
LISST-HOLO can be
used with?
The concentration limits for a LISST-HOLO are roughly as tabulated in the table below. See also this
article on
Sequoia’s website:
http://www.sequoiasci.com/article/what-are-the-concentration-limits-for-
the-lisst-holo/ for a more thorough explanation.
Mean Particle Diameter Wentworth Grades Maximum
Concentration
[µm] [phi] [mg/l]
1.95 9.00 Clay 8
3.9 8.00 Very Fine Silt 15
7.8 7.00 Fine Silt 31
15.6 6.00 Medium Silt 62
31.25 5.00 Coarse Silt 123
62.5 4.00 Very Fine Sand 247
125 3.00 Fine Sand 494
250 2.00 Medium Sand 987
How do I tell if the
suspended sediment
concentration is too
high? If you cannot see any interference patterns in the hologram (lots of concentric rings), the
concentration is too high and you most likely won’t get any sensible data out of the hologram when
processing it.
Why can I choose
between spherical and
random size ranges in
HOLO_Batch?
For Sequoia’s LISST-100X and LISST-STX instruments, the user has the option to process the data
assuming two different types of particle types: Spherical particles and Randomly shaped particles
(sediment grains). The size ranges differs between these two processing options. In order to make it
easier for LISST-HOLO users to merge their data with LISST-100X data, this option has been
transferred to the HOLO_Batch processing software as well. It has no influence on the processing of
the holograms; only on the size bins used for the final size distributions.
Why are my
holograms completely
black?
Adjust the laser power and exposure fields either on the tools page (if capturing images from the tool
menu) or in the sampling program page (if running a sampling program).