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Features
(subject to change without notice)
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In-situ digital holography
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Self-contained with internal datalogger
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Ethernet connection to PC for programmable data collection
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Power via external battery pack (accessory) or external power source
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Two options for hologram offloading:
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Ethernet connection directly to PC (~4 seconds / hologram)
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External, submersible, swappable USB flash drive (~0.5 seconds / hologram)
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Specifications
(subject to change without notice)
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Parameters Measured
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2MB Hologram containing the interference pattern of all particles in the laser beam
(
what is a hologram?
)
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Depth
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Temperature
Parameters derived upon hologram processing
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Particle Size Distribution (PSD)
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Standard Deviation of PSD
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Particle Area Concentration
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Mean and Median particle size
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120 seconds processing time per hologram in MATLAB (typical, @ 2.2 GHz PC)
(
what determines the processing time?
)
Sediment Size distribution and concentration range
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~25-2500µm size range
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Beam attenuation values between 0 and 4 m-1
- Maximum concentration between 10 and 1000 mg/l, depending on grain size. (How is this computed?)
Technology
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Solid state laser diode @ 658 nm, xx mW
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4.4µm pixel size digital camera, 1600 x 1200 pixels
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2 MB hologram size
(
what is a hologram?
)
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Hologram capture rate programmable up to 0.2 Hz
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Optical path length 50 mm standard
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Sampling volume 1.86 cm
3
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Maximum current velocity/CTD speed during deployment: 0.4 m s
-1
(
why is there a limit to current speed?
)
Mechanical and Electrical
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Dimensions: 13.3 cm × 76.7 cm (5.25" × 30.21") [Ø × L]
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Weight: 9.5 kg (21 lbs) in air; 3.6 kg (8 lbs) in water
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300 m depth rating
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32 GB internal solid state drive
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32 GB external USB flash drive
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Battery life: 10,000 holograms for standard 9V, 42Ah battery
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External power input: 9VDC nominal, 6-15VDC
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Power drain: 200µA / 500mA / 600mA / 880mA (sleeping / idling / laser on / laser + camera on)
- Weight of EXTERNAL battery case (sold separately): 8.2 kg (18 lbs) in air.
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Drawings
(click to enlarge)
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LISST-HOLO.
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LISST-HOLO external battery case (not included, sold separately).
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Updated 6/7/2011
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|  | | Sequoia visit to Colombia and Ecuador! |  | | Sequoia's Yogi Agrawal and Ole Mikkelsen visited C'Particulas, Sequoia's Colombian distributor 28-30 November 2011. See the pictures on our facebook page! | |  | |  | |
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