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Sequoia Scientific

Hyper-a Hyperspectral absorption instrument

LISST-OST (NSF STTR Phase I)

Optical Sediment Trap (Patent Pending)

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LISST-OST measures diffuse attenuation from which sinking POC and particle flux can be derived

See a list of papers published with LISST-OST data here!

The LISST-OST (Patent Pending) is designed for integration onto Argo and other robotic and autonomous profiling floats. The sensor monitors sinking particles by measuring changes in diffuse attenuation as particles settle onto a large collection window and accumulate over time. Changes in the measured attenuation can be correlated with particle flux and used as a proxy for particulate organic carbon (POC) flux. Although designed for Lagrangian floats to perform measurements when parked at 2,000 meters, the LISST-OST can also potentially be mounted on fixed platforms for long-term deployments with an optional wiper accessory to help mitigate biofouling.

More Info

• Measures diffuse optical transmission
• Off-axis optical geometry to reduce interference with settling particles
• Large optical beam cross section (approximately 5 cm at the receive window)
• Ambient light rejection through light modulation and synchronous detection
• Externally powered
• RS-232 real-time output
• Onboard temperature compensation
• Optional wiper accessory available for long-term deployments with depth rating of 30 m (standard) or 100 m (extended); ONLY recommended for use in Eulerian mode, NEVER in Lagrangian mode
• Optional data logger available: NexSens X3 (IP68 rated) or NexSens X3-SUB (depth rated to 61 m)
• Software included with the instrument for transmission measurements; does not include interpretations of attenuance flux or relationships to POC flux, which must be established by the user
• Custom cable lengths available

Sponsor

This project was funded through NSF’s Small Business Technology Transfer (STTR) program under contract #2136735. To learn more about the program, click here: NSF’s SBIR/STTR Program

 

Updates

12/31/2022 - The NSF STTR Phase I project officially concluded, after which the LISST-OST was transitioned to a commercial product: https://www.sequoiasci.com/product/lisst-ost/.

Accessories

LISST-OST Item # and Description

Item #DescriptionThumbnail
SEQ-FP-LOSTLISST-OST - Optical Sediment Trap

LISST-OST Accessories *INCLUDED* with LISST-OST

Item #DescriptionThumbnail
SEQ-AC-LTAU-CBL02LISST-OST 2-meter integrated communication and external power USB cable.

LISST-OST Accessories *NOT INCLUDED* with LISST-OST

Item #DescriptionThumbnail
SEQ-AC-LOST-WPRLISST-OST Wiper for Eulerian (moored) deployment <100 m depth ONLY.No picture (yet!)
SEQ-AC-LTAU-ZINCLISST-Tau / -OST Replacement Zinc Anode Ass'y (2 Pack)
SEQ-AC-LTAU-ZINC10LISST-Tau / -OST Replacement Zinc Anode Ass'y (10 Pack)
SEQ-AC-LOST-YCBLL-OST Replacement 'Y' Cable Assembly

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