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  • Library | Sequoia Scientific
    Downloads Warranty Info Installation Requirements Responsibilities Warranty Register a Product Returns Contact Support Library Articles Technical Papers Standards About Staff News Events PiE Conference 2014 Customer List Newsletter Contact Sequoia International Distributors Sequoia Scientific New Product LISST ABS Log In Register Home Library Library Here you can browse our library of articles technical papers and industry standards More in Library Library Articles Technical Papers Standards Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro LISST Infinite LISST VSF LISST STOKES Optical VSF Sensors LISST SL LISST 25X FlowControl Instruments FlowControl Lab FlowControl Sub Radiative Transfer Models EcoLight S HydroLight Accessories How to Buy Request a Quote Terms Of Sale Support FAQ Downloads Warranty Info Installation Requirements Responsibilities Warranty Register a Product Returns Contact Support Library Articles Technical Papers Standards About Staff News Events PiE Conference 2014 Customer List Newsletter Contact Sequoia International Distributors News More News PiE 2016 Conference to be in Budapest Hungary February 7 2016 Version 5 1 Software Release Guides Background Collection November 10 2015 New Product Announcement LISST

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  • Articles | Sequoia Scientific
    Dredging and Contaminated Sediment Removal Dredging is essential for creation or maintenance of navigation channels as well as for removing contaminated sediments The contamination of water by dredged sediments is regulated in most developed and some developing countries LISST ABS for Protecting Hydro Turbines from Abrasion Sequoia manufactures two instruments based on laser diffraction for monitoring sediments entering hydro turbines These are the LISST Hydro and LISST Infinite These two produce data on sediment concentration sorted into 3 size classes fine 75μm medium 75 to 200 μm and coarse 200 to Comparing Optical Turbidity With LISST ABS For measuring suspended sediments the use of optical backscatter sensors or other turdibity sensors is widespread At the same time it is understood that these sensors respond to total particle area not volume or mass In other words optical turbidity sensors have this property their sensitivity Understanding LISST ABS This Note is written for those users who wish to get a deeper understanding of acoustic backscattering and its use in the LISST ABS It expands on the very simple page How LISST ABS Works To see FAQ s click here To under strength of sound back scattering by particles click here What follows How The LISST ABS Works Updated 2 Feb 2016 INTRODUCTION Sequoia s Acoustic Backscatter Sensor LISST ABS is designed to measure suspended sediment concentration at a point Unlike ADCP s which may record similar backscatter strength at multiple points along the acoustic beams ranges the LISST ABS Sensitivity of Response of LISST ABS and OBS to Size Distribution Changes This Note shows how the calibration of the LISST ABS acoustic backscatter sensor and of optical backscatter sensor OBS changes when water contains a broad distribution of particle sizes and why LISST ABS is inherently superior Particle size distributions in water

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  • Technical Papers | Sequoia Scientific
    Wetlands Wetlands 31 699 712 doi 10 1007 s13157 011 0185 4 Yu J Jiang J Gong D Li S Xu Y 2011 Determining suspended sediment concentration and settling velocity from PC ADP measurements in the Beibu Gulf China Chinese Journal of Oceanology and Limnology doi 10 1007 s00343 011 0164 x Zeng M Fan D Sun X Wang S Yang Z 2011 The grain size distribution of the suspended particulate matter in the Huanghe Estuary and its adjacent sea area in winter Acta Oceanologica Sinica 30 2 75 83 doi 10 1007 s13157 011 0185 4 2010 Anderson CW Fisk GG Gartner JW Glysson GD Gooding DJ Gray JR Hornewer NJ Larsen MC Macy JP Rasmussen PP Wright SA Ziegler AC 2010 Surrogate technologies for monitoring suspended sediment transport in rivers In Poleto C Charlesworth S Eds Sedimentology of Aqueous Systems Wiley Blackwell London pp 3 45 Download pdf from USGS Braithwaite KM Bowers DG Nimmo Smith WAM Graham GW Agrawal YC Mikkelsen OA 2010 Observations of particle density and scattering in the Tamar Estuary Marine Geology 277 1 4 1 10 Graham GW Nimmo Smith WAM 2010 The application of holography to the analysis of size and settling velocity of suspended cohesive sediments Limnology Oceanography Methods 8 1 15 doi 10 4319 lom 2010 8 1 Hsu RT Liu JT 2010 In situ estimations of the density and porosity of flocs of varying sizes in a submarine canyon Marine Geology 276 1 4 105 109 doi 10 1016 j margeo 2010 07 003 Hubbart JA Freeman G 2010 Sediment Laser Diffraction A new approach to an old problem in the central US Stormwater October 2010 36 44 Hubbart JA Gebo NA 2010 Quantifying the Effects of Land Use and Erosion Particle class size analysis sheds light on the relationship between land use and suspended sediment Erosion Control November December 2010 xx xx Lewis A Trudel BK Belore RC Mullin JV 2010 Large scale dispersant leaching and effectiveness experiments with oils on calm water Marine Pollution Bulletin 60 244 254 doi 10 1016 j marpolbul 2009 09 019 Li Z Lee K King T Boufadel MC Venosa AD 2010 Effects of temperature and wave conditions on chemical dispersion efficacy of heavy fuel oil in an experimental flow through wave tank Marine Pollution Bulletin 60 9 1550 1559 doi 10 1016 j marpolbul 2010 04 012 Liu JT Wang YH Lee I H Hsu RT 2010 Quantifying tidal signatures of the benthic nepheloid layer in Gaoping Submarine Canyon in Southern Taiwan Marine Geology 271 1 2 119 130 doi 10 1016 j margeo 2010 01 016 Qiao S Shi X Zhu A Liu Y Bi N Fang X Yang G 2010 Distribution and transport of suspended sediments off the Yellow River Huanghe mouth and the nearby Bohai Sea Estuarine Coastal and Shelf Science 86 3 337 344 doi 10 1016 j ecss 2009 07 019 Rex JF Petticrew EL 2010 Salmon derived nitrogen delivery and storage within a gravel bed Sediment and water interactions Ecological Engineering 36 9 1167 1173 doi 10 1016 j ecoleng 2010 02 001 Reynolds RA Stramski D Wright VM Wozniak SB 2010 Measurements and characterization of particle size distribution in coastal waters Journal of Geophysical Research 115 C08024 doi 10 1029 2009JC005930 Ryan JP McManus MA Sullivan JM 2010 Interacting physical chemical and biological forcing of phytoplankton thin layer variability in Monterey Bay California Continental Shelf Research 30 1 7 16 doi 10 1016 j csr 2009 10 017 Shugar DH Kostachuk R Best JL Parsons DR Lane SN Orfeo O Hardy RJ 2010 On the relationship between flow and suspended sediment transport over the crest of a sand dune Río Paraná Argentina Sedimentology 57 1 252 272 doi 10 1111 j 1365 3091 2009 01110 x Trudel K Belore RC Mullin JV Guarino A 2010 Oil viscosity limitation on dispersibility of crude oil under simulated at sea conditions in a large wave tank Marine Pollution Bulletin 60 9 1606 1614 doi 10 1016 j marpolbul 2010 01 010 2009 Ackerman D Nezlin NP 2009 Suspended particle dynamics in a southern California urban estuary during the dry season In Southern California Coastal Water Research Project Annual Report 2009 pp 97 108 Download pdf external link Agrawal YC Mikkelsen OA 2009 Shaped focal plane detectors for particle concentration and mean size observations Optics Express 17 23066 23077 doi 10 1364 OE 17 023066 Agrawal YC Mikkelsen OA 2009 Empirical forward scattering phase functions from 0 08 to 16 deg for randomly shaped terrigenous 1 21 µm sediment grains Optics Express 17 8805 8814 doi 10 1364 OE 17 008805 Badewien TH Zimmer E Bartholomä A Reuter R 2009 Towards continuous long term measurements of suspended particulate matter SPM in turbid coastal waters Ocean Dynamics 59 2 227 238 doi 10 1007 s10236 009 0183 8 Bartholomä A Kubicki A Badewien TH and Flemming BW 2009 Suspended sediment transport in the German Wadden Sea seasonal variations and extreme events Ocean Dynamics 59 213 225 doi 10 1007 s10236 009 0193 6 Belore RC Trudel K Mullin JV Guarino A 2009 Large scale cold water dispersant effectiveness experiments with Alaskan crude oils and Corexit 9500 and 9527 dispersants Marine Pollution Bulletin 58 118 128 doi 10 1016 j marpolbul 2008 08 013 Blake WH Wallbrink PJ Droppo IG 2009 Sediment aggregation and water quality in wildfire affected river basins Marine and Freshwater Research 60 7 653 659 Boes RM 2009 Real time monitoring of suspended sediment concentration and particle size distribution in the headwater way of a high head hydropower plant Proc 33rd IAHR Congress Vancouver 11026 4037 4044 Boss E Slade WH Behrenfeld M Dall Olmo G 2009 Acceptance angle effects on the beam attenuation in the ocean Optics Express 17 1535 1550 Download pdf Brown J Ackerman D Stein E 2009 Continuous in situ characterization of particulate sizes in urban stormwater Method testing and refinement In Southern California Coastal Water Research Project Annual Report 2009 pp 183 193 Download pdf external link Gray JT Gartner JW 2009 Technological advances in suspended sediment surrogate monitoring Water Resources Research 45 W00D29 doi 10 1029 2008WR007063 Hodder KR 2009 Flocculation a key process in the sediment flux of a large glacier fed lake Earth Surface Processes and Landforms doi 10 1002 esp 1807 Krivtsov V Howarth MJ Jones SE 2009 Characterising observed patterns of suspended particulate matter and relationships with oceanographic and meteorological variables Studies in Liverpool Bay Environmental Modelling Software 24 677 685 doi 10 1016 j envsoft 2008 09 012 Soler M Serra T Casamitjana X Colomer J 2009 High sedimentation rates in a karstic lake associated with hydrothermal turbid plumes Lake Banyoles Catalonia NE Spain Sedimentary Geology 222 1 2 5 15 van der Lee EM Bowers DG Kyte E 2009 Remote sensing of temporal and spatial patterns of suspended particle size in the Irish Sea in relation to the Kolmogorov microscale Continental Shelf Research 29 1213 1225 doi 10 1016 j csr 2009 01 016 2008 Agrawal YC Whitmire A Mikkelsen OA Pottsmith HC 2008 Light scattering byrandom shaped particles and consequences on measuring suspendedsediments by laser diffraction Journal of Geophysical Research 113 C04023 doi 10 1029 2007JC004403 Download pdf Anglès S Jordi S Garcés E Masó M Basterretxea G 2008 High resolution spatio temporal distribution of a coastal phytoplankton bloom using laser in situ scattering and transmissometry LISST Harmful Algae 7 808 816 doi 10 1016 j hal 2008 04 004 Bourrin F Friend PL Amos CL Manca E Ulses C Palanques A Durrieu de Madron X Thompson CEL 2008 Sediment dispersal from a typical Mediterranean flood The Tet River Gulf of Lions Continental Shelf Research 28 1895 1910 doi 10 1016 j csr 2008 06 005 Bourrin F Durrieu de Madron X Heussner S Estournel C 2008 Impact of winter dense water formation on shelf sediment erosion evidence from the Gulf of Lions NW Mediterranean Continental Shelf Research 28 1984 1999 doi 10 1016 j csr 2008 06 006 Chang G Honda M Nencioli F 2008 Innovations in optics for coastal and open ocean mooring applications Sea Technology 49 8 17 22 Fettweis M 2008 Uncertainty of excess density and settling velocity of mud flocs derived from in situ measurements Estuarine Coastal and Shelf Science 78 426 436 doi 10 1016 j ecss 2008 01 007 He Q Tang J Cheng J 2008 A study of in situ floc size in turbidity maximum Yangtze estuary China In Kusuda T Yamanishi H Spearman J Gailani JZ Eds Sediment and Ecohydraulics INTERCOH 2005 Proceedings in Marine Science Vol 9 Elsevier pp 287 294 Google Book Search preview Jouon A Ouillon S Douillet P Lefebvre J P Fernandez J M Mari X Froidefond J M 2008 Spatio temporal variability in suspended particulate matter concentration and the role of aggregation on size distribution in a coral reef lagoon Marine Geology 256 36 48 doi 10 1016 j margeo 2008 09 008 Krivtsov V Howarth MJ Jones SE Souza AJ Jago CF 2008 Monitoring and modelling of the Irish Sea and Liverpool Bay An overview and an SPM case study Ecological Modelling 212 37 52 doi 10 1016 j ecolmodel 2007 10 038 KrivtsovV Gascoigne J Jones SE 2008 Harmonic analysis of suspended particulate matter in the Menai Strait UK Ecological Modelling212 53 67 doi 10 1016 j ecolmodel 2007 10 039 Li Z Lee K Kepkay P King T Yeung W Boufadel MC Venosa AD 2008 Wave Tank Studies on Chemical Dispersant Effectiveness Dispersed Oil Droplet Size Distribution In Davidson WF Lee K Cogswell A Eds Oil Spill Response A Global Perspective NATO Science for Peace and Security Series C Environmental Security Springer pp 143 157 doi 10 1007 978 1 4020 8565 9 Meral R 2008 Laboratory evaluation of acoustic backscatter and LISST methods for measurements of suspended sediments Sensors 8 979 993 Mikkelsen OA Milligan TG Hill PS Chant RJ Jago CF Jones SE Krivtsov V Mitchelson Jacob G 2008 The influence of schlieren on in situ optical measurements used for particle characterization Limnology Oceanography Methods 6 133 143 Download pdf Rex JF Petticrew EL 2008 Delivery of marine derived nutrients to streambeds by Pacific salmon Nature Geoscience 1 840 843 doi 10 1038 ngeo364 Rienecker E Ryan J Blum M Dietz C Coletti L Marin III R Paul Bissett W 2008 Mapping phytoplankton in situ using a laser scattering sensor Limnology Oceanography Methods 6 153 161 Rogers AL Ravens TM 2008 Measurement of longshore sediment transport rates in the surf zone on Galveston Island Texas Journal of Coastal Research 24 2B 62 73 doi 10 2112 05 0564 1 S L Ross Environmental Research 2008 Updating the SMART dispersant monitoring protocol Review of commercial off the shelf instruments Final report for USCG R D Center and US Department of the Interior Minerals Management Service 23 pp Download pdf S L Ross Ross Environmental Research Ltd 2008 Updating the SMART Dispersant Monitoring Protocol Review of Ohmsett Results from 2001 2007 S L Ross Environmental Research Ltd Ottawa ON Canada 45 pp Download pdf Williams ND Walling DE Leeks GJL 2008 An analysis of the factors contributing to the settling potential of fine fluvial sediment Hydrological Processes 22 4153 4162 doi 10 1002 hyp 7015 Yuan Y Wei H Zhao L Jiang W 2008 Observations of sediment resuspension and settling off the mouth of Jiaozhou Bay Yellow Sea Continental Shelf Research 28 2630 2643 doi 10 1016 j csr 2008 08 005 2007 Ahn JH Grant SB 2007 Size Distribution Sources and Seasonality ofSuspended Particles in Southern California Marine Bathing Waters Environmental Science and Technology 41 695 702 doi 10 1021 es061960 Ahn JH Grant SB 2007 Characteristics of storm runoff and sedimentdispersal in the San Pedro Channel southern California Water Science Technology 55 519 526 doi 10 2166 wst 2007 032 Bowers DG Binding CE EllisKM 2007 Satellite remote sensing ofthe geographical distribution of suspended particle size in an energetic shelfsea Estuarine Coastal and Shelf Science73 457 466 doi 10 1016 j ecss 2007 02 005 Curran KJ Hill PS MilliganTG Mikkelsen OA Law BA Durrieu de Madron X Bourrin F 2007 Settling velocity effective density andmass composition of suspended sediment in a coastal bottom boundary layer Gulf of Lions France Continental Shelf Research27 1408 1421 doi 10 1016 j csr 2007 01 014 Karp Boss L Azevedo L BossE 2007 LISST 100 measurements ofphytoplankton size distribution evaluation of the effects of cell shape Limnology Oceanography Methods5 396 406 Download pdf Li ZK Kepkay P Lee K KingT Boufadel MC Venosa AD 2007 Effects of chemical dispersants and mineral fines on crude oil dispersion in a wavetank under breaking waves Marine Pollution Bulletin 54 983 993 doi 10 1016 j marpolbul 2007 02 012 Mikkelsen OA Curran KJ Hill PS Milligan TG 2007 Entropy analysis of in situ particle size spectra Estuarine Coastal and Shelf Science72 615 625 doi 10 1016 j ecss 2006 11 027 Download pdf Perkins M Effler SW Peng F Pierson D Smith DG Agrawal YC 2007 ParticleCharacterization and Settling Velocities for a Water Supply Reservoir during aTurbidity Event Journal of EnvironmentalEngineering 133 800 808 doi 10 1061 ASCE 0733 9372 2007 133 8 800 Wei JW Shi XF Fang XS Zhang WB 2007 Measurements of suspended particulate matter with laserin situ scattering and transmissometry in the Jiaozhou Bay in China Acta OceanologicaSinica 26 55 65 Williams ND Walling DE Leeks GJL 2007 High temporalresolution in situ measurement of the effective particle size characteristicsof fluvial suspended sediment WaterResearch 41 1081 1093 doi 10 1016 j watres 2006 11 010 Winter C Becker M Ernstsen VB Hebbeln D Port A Bartholomä A Flemming B Lunau M 2007 In situ observation of aggregate dynamics in a tidal channel using acoustics laser diffraction and optics Journal of Coastal Research Special Issue 50 1173 1177 Winter C Katoshevski D Bartholoma A Flemming BW 2007 Grouping dynamics of suspended matter in tidal channels Journal of Geophysical Research 112 C08010 doi 10 1029 2005JC003423 2006 Agrawal YC Whitmire A PottsmithHC 2006 Light scattering by random irregular shaped terrigenous sediment particles Proceedings of Ocean Optics XVIII Conference 9 13 October 2006 Montreal Quebec Canada Download pdf Agrawal YC Whitmire A PottsmithHC 2006 Shape effects on particlesizing by laser diffraction PECS Conference 18 22September 2006 Astoria Oregon USA Chang TS Joerdel O Flemming BW Bartholoma A 2006 Therole of particle aggregation disaggregation in muddy sediment dynamics andseasonal sediment turnover in a back barrier tidal basin East Frisian WaddenSea southern North Sea Marine Geology235 49 61 doi 10 1016 j margeo 2006 10 004 Fettweis M Francken F Pison V van den Eynde D 2006 Suspendedparticulate matter dynamics and aggregate sizes in a high turbidity area Marine Geology 235 63 74 doi 10 1016 j margeo 2006 10 005 Fugate D Chant B 2006 Aggregate settling velocity of combined sewage overflow MarinePollution Bulletin 52 427 432 doi 10 1016 j marpolbul 2005 09 042 Ganju NK Schoellhamer DH Murrell MC Gartner JW Wright SA 2006 Constancy of the relation between floc size and density in San Francisco bay In Maa J Sanford LP Schoellhamer D Eds Estuarine and Coastal Fine Sediment Dynamics INTERCOH 2003 Proceedings in Marine Science Volume 8 Elsevier Amsterdam pp 75 92 Hipsey MR Brookes JD RegelRH Antenucci JP Burch MD 2006 Insitu evidence for the association of total coliforms and Escherichia coli withsuspended inorganic particles in an Australian reservoir Water Air and Soil Pollution 170 191 209 doi 10 1007 s11270 006 3010 6 Jago CF Jones SE Sykes P Rippeth T 2006 Temporal variation of suspended particulate matter andturbulence in a high energy tide stirred coastal sea Relative contributionsof resuspension and disaggregation Continental Shelf Research 26 2019 2028 doi 10 1016 j csr 2006 07 009 Lee I H Liu JT 2006 Rectification of the heading and tilting of sediment trap arrays due to strong tidal currents in a submarine canyon Geophysical Research Letters 33 L08609 doi 10 1029 2005GL025183 Lee HJ Wang YP Chu YS Jo HR 2006 Suspended Sediment Transport in the Coastal Area of Jinhae Bay Nakdong Estuary Korea Strait Journal of Coastal Research 22 1062 1069 doi 10 2112 04 0231 1 Mikkelsen OA Hill PS Milligan TG 2006 Single grain microfloc and macrofloc volume variations observed with a LISST 100 and a digital floc camera Journal of Sea Research 55 87 102 doi 10 1016 j seares 2005 09 003 Download pdf Pedocchi F García MH 2006 Noise resolution trade off inprojection algorithms for laser diffraction particle sizing Applied Optics 45 3620 3628 Download pdf Pedocchi F García MH 2006 Evaluation of the LISST STinstrument for suspended particle size distribution and settling velocitymeasurements Continental Shelf Research26 943 958 doi 10 1016 j csr 2006 03 006 Download pdf Slade WH Boss E 2006 Calibrated near forward volume scatteringfunction obtained from the LISST particle sizer Optics Express 14 3602 3615 Styles R 2006 Laboratory evaluation of the LISST in astratified fluid Marine Geology 227 151 162 doi 10 1016 j margeo 2005 11 011 Sun ZP Jiang WS 2006 Size spectrum of suspendedparticulate matter in the Bohai Sea Oceans 2006 IEEE Conference Proceedings vols 1 4 pp 353 359 doi 10 1109 OCEANS 2006 307090 Ojo T Bonner JS Page C WilliamsD Kraus N 2006 Coastal ObservingSystems Addressing Science while Fulfilling the Needs of Regulators Managersand Stakeholders Oceans 2006 IEEEConference Proceedings vols 1 4 pp 1042 1047 doi 10 1109 OCEANS 2006 306860 2005 Agrawal YC 2005 The optical volume scattering function temporal and vertical variability inthe water column off the New Jersey Coast Limnology and Oceanography 50 1787 1794 Download pdf Agrawal YC Pottsmith HC 2005 The isokinetic streamlinedsuspended sediment profiling LISST SL Status and Field Results Proceedings of the 8th FISC Conference Reno NV April 2006 Agrawal YC Pottsmith HC 2005 Turbine erosion Lasers warn ofabrasive sediments HYDRO 2005 conference Villach Austria October 2005 Durrieu de Madron X FerreB Le Corre G Grenz C Conan P Pujo Pay M

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  • Standards | Sequoia Scientific
    recommend visiting http www omega com techref ph 6 html US EPA 180 1 This is the US version of the ISO standard mentioned above The results are reported in NTU Nephelometric Turbidity Units again with Formazin as the standard This method unlike ISO 7027 this standard is more lax and therefore even less reliable The scattering angle can be 90 20 degrees The lamp need not be monochromatic etc Fundamentally this method suffers from all the ills of the ISO method Drinking Water Standards EPA Standards Particles Sequoia provides a 1 g vial of standard particles with each instrument typically in the 75 90µm size range Beyong that Sequoia does not sell or supply standard particles Please contact the manufacturers below directly if you wish to purchase standards to use with your LISST instrument Polystyrene spheres For extremely precisely sized polystyrene spheres go to http www dukescientific com Glass beads To obtain Glass Microspheres for laboratory calibrations visit http www whitehousescientific com Sequoia uses the following Whitehouse Glass Microspheres for validation Sieve Fraction µm Catalogue No Nominal Weight g 20 30 GP0025 100 25 32 GP0029 100 32 45 GP0042 100 75 90 GP0083 100 180 212 GP0196 200 300 355 GP0328 200 315 355 GP0335 200 ISO 12103 1 1997 AZ test dust To obtain natural particle standards of Arizona Test Dust also called AC Spark Plug Powder contact Powder Technology Inc These particles are also used as a standard by USGS Sequoia uses the following Arizona Test Dust Nominal Sizes for validation Nominal Size Range µm ISO 2 6 4 8 6 5 11 20 30 32 63 1 80 ISO 12103 1 A3 Medium Test Dust 1 180 ISO Coarse A T D 12103 1 A4 Turbidity Standards To obtain Turbidity Standards in NTU units visit

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  • About | Sequoia Scientific
    It remains the only instrument worldwide with this capability Derivative instruments have been offered over the years e g the LISST ST measures the settling velocity of particles suspended in water in situ An iso kinetic sensor system LISST SL was developed to measure sediments and other parameters for monitoring rivers The world s first and still the only battery powered airplane portable laser diffraction system is our product LISST Portable XR It is used among others by drillers in the oil and gas industry to size drilling muds Still other systems LISST HYDRO and LISST INFINITE are made to guard hydropower turbines against abrasion in run of river plants or for observing rates of siltation of reservoirs These various sensors are in use by US and 30 plus international government agencies academics consulting and environmental monitoring companies A network of International Distributors supports our customers The products are cited in ISO 11657 For scientists computing propagation of light in water the company offers a radiative transfer model software HYDROLIGHT In 2011 the company introduced its first in line holographic particle measuring instrument LISST HOLO In 2015 the company added still new technology the LISST ABS This incorporates high frequency acoustic backscatter for measuring suspended sediments The LISST ABS delivers dramatically superior performance over optical backscatter devices If you measure particles we most probably have the best solution for you Browse our pages or simply contact us More in About About Suspended Sediment Concentration and Particle Sizing Methods Course Staff News PiE Conference 2014 PiE Conference 2014 Customer List Newsletter Contact International Distributors Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro

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  • Staff | Sequoia Scientific
    exotic locations around the world Recent trips have included Alaska Greece and eastern Greenland Norway is our next destination I lead trips for Wilderness Volunteers a non profit organization that does trail maintenance habitat restoration archaeological surveys and similar work in National Parks wilderness areas wildlife refuges and other public lands My wife and I both lead white water raft trips and cultural trips in China for the Sierra Club You can see photos from recent trips at our Smugmug site I think everyone should have an ongoing project for which failure is guaranteed but which will leave you a better person For that last few years my project has been learning a bit of Mandarin Chinese Oh yea I m a pretty good gourmet cook and a mediocre photographer I like cats but I m allergic to them Yogi Agrawal Yogi s research interests are in the processes that involve turbulence at the sea surface and on the sea floor These processes affect sediment suspension and transport on the sea floor and they determine gas exchange and surface currents at the sea surface Yogi s contributions to these fields include new measurement techniques with the use of laser instrumentation In his first ocean research program Yogi developed an autonomous deep sea laser Doppler velocimeter which operating at a depth of 5000 meters obtained data on the structure of the boundary layer at small heights above the seabed Subsequent applications of this technology has been made to study shallow water bottom boundary layers The contributions in the surface boundary layer dynamics made with a version of the deep sea laser velocimeter confirmed the existence of a super dissipative layer beneath wind forced breaking waves This work was published in Nature please see publications list More recently he is developing a laser sensor for the direct observation of the rate of turbulent kinetic energy dissipation known as the dissipation rate A powerful series of instruments for measuring sediment properties are Yogi s other contribution to sediment transport research Using laser diffraction techniques common in the laboratory it is now possible to measure particle including bubble size distribution for periods up to several months in the sea from programmable unattended recording instruments Sequoia Scientific Inc markets these instruments known as the LISST 100 Yogi co founded Sequoia Scientific Inc with H Charles Chuck Pottsmith his partner in science and business A newer version of this instrument incorporates a settling tube and is known as the LISST ST Sequoia has also developed a new concept sediment sensor the LISST 25 which circumvents the historical problem of sediment concentration sensors calibration change with changed particle size Yogi s other passions are his family and the propagation of the Sequoia Giganteum tree His latest experiment is the propagation of the Sequoia in the Himalayas where he has planted 50 trees in 1998 Yogi thinks he plays tennis and soccer although evidence of this activity is hard to find in modern times The company Sequoia seems

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  • News | Sequoia Scientific
    University of Read more Version 5 1 Software Release Guides Background Collection November 10 2015 New V5 1 Diagnoses Background for Misalignment Dirty water or windows etc and guides acceptance For all those users of our LISST 100X series instruments who have asked after collecting a background file should I accept and save here is help This Read more New Product Announcement LISST ABS April 9 2015 Sequoia Scientific is pleased to announce a new product that does not use a laser or optics The LISST ABS is an acoustic backscatter sensor that has been designed from the ground up as a replacement and improvement to optical turbidity sensors for measuring Read more New Portable Particle Size Analyzer at Pittcon 2015 March 2 2015 Sequoia Scientific will be exhibiting at the Pittcon conference for the first time They will be displaying for the LISST Portable XR Particle Size Analyzer It is a truly portable particle size analyzer with a built in battery and touch panel display Read more New LISST Portable XR Video on Filling the Mixing Chamber January 21 2015 We are continuing to add additional instructional videos on the operation of the LISST Portable XR Below is the more recent addition that discusses the best practices for filling the Mixing Chamber We are working on some additional videos that we Read more Previous More in About About Suspended Sediment Concentration and Particle Sizing Methods Course Staff News PiE Conference 2014 PiE Conference 2014 Customer List Newsletter Contact International Distributors Categories General News Press Releases Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro LISST Infinite LISST VSF LISST STOKES Optical

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  • Upcoming Events | Events | Sequoia Scientific
    Center 900 Convention Center Blvd New Orleans LA 70130 United States Google Map Sequoia Scientific will be at the 2016 Ocean Sciences meeting with the full LISST product line on display We will also be presenting during the technical sessions Stop by the Sequoia booth to see the latest Sequoia products Find out more March 2016 PITTCON 2016 Conference March 6 March 10 Georgia World Congress Center 285 Andrew Young International Blvd NW Atlanta GA 30313 United States Google Map Sequoia will be exhibiting at the 2016 PITTCON conference Please stop by our booth to see the latest developments in portable particle size analyzers Find out more Events List Navigation laquo Previous Events Export Listed Events More in About About Suspended Sediment Concentration and Particle Sizing Methods Course Staff News PiE Conference 2014 PiE Conference 2014 Customer List Newsletter Contact International Distributors Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro LISST Infinite LISST VSF LISST STOKES Optical VSF Sensors LISST SL LISST 25X FlowControl Instruments FlowControl Lab FlowControl Sub Radiative Transfer

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