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  • Beta release of LISST-SOP version 5.0! | Sequoia Scientific
    minutes stop can be whatever Click OK to load the settings on to the instruments Do NOT start the instrument when the dialog box pops up Click No then OK to the information box and go to File Realtime mode Select background scatter file and the output file name The realtime window opens up Check the Listen Mode box and open the terminal window Click start in the terminal window Random shape matrix vs spherical matrix Click File Settings Output and click the shape model you want to use or both Put the asc files with the random shape data rs asc extention into the LISST folder so that the exe program can find them they are needed for the random shape computatiosn At present January 2009 the type B matrix is still preliminary but still performs superior to the spherical shape matrix The science behind the development of the matrices can be read in this paper by Agrawal et al 2008 Zscat file reminder The user is now prompted to select a zsc file to be used for processing when programming the instrument If the zscat file is too old a warning will be issued and the user prompted to confirm that s he understands that continuing might compromise the final data quality The SOP now has the capability to process log files obtained in the real time mode Select File Open Raw Data file and then select log files in Files of Type Download the beta version here Make sure you already have version 4 65 installed then download the exe file for version 5 0 and replace your existing 4 65 executable with the one for version 5 0 If you do not have version 4 65 installed then download the installer package for version 4 65

    Original URL path: http://www.sequoiasci.com/about/news/beta-release-of-lisst-sop-version-5-0/ (2016-02-13)
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  • Mie theory phase function and LISST-100X measurements | Sequoia Scientific
    between Mie theory phase function and LISST 100X measurement Sequoia May 30 2008 The following data were acquired on 20 July 2006 and selected randomly for a comparison with Mie theory Phase function calculations from the LISST 100X data follow the method described in Agrawal 2005 The agreement between Mie theory and the LISST 100X is remarkable without any adjustment of fitting parameters the LISST 100X captures the first and second lobe of the phase function Readers intimately familiar with Mie scattering may ask themselves Why does the LISST 100X only capture the first two lobes The reason for this is that the LISST 100X ring detectors become logarithmically broader as the scattering angle increases As a consequence they do not capture the higher oscillations of Mie theory as the oscillations occur over an angle range that is smaller than the scattering angles covered by the detectors The reason for this detector design was driven by inversion algorithms for recovering size distribution a feature of logarithmic spaced detectors is that they capture the first two main scattering lobes for any size particles within the instrument measurement range The LISST 100X is suitable for measuring the phase function when the underlying particle populations are poly disperse as is mostly the case in the aquatic environment Questions about this article Email us 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

    Original URL path: http://www.sequoiasci.com/article/mie-theory-phase-function-and-lisst-100x-measurements/ (2016-02-13)
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  • Integration of high accuracy conductivity and temperature measurements with the LISST-100X | Sequoia Scientific
    Integration of high accuracy conductivity and temperature measurements with the LISST 100X Sequoia April 18 2008 this article is based on Application Note L004 As an option the LISST 100X can be interfaced with a number of external sensors such as a Sea Bird MicroCat CTD a Campbell OBS 3 or a Turner Designs Cyclops 7 fluorometer The data stream from the sensors are embedded in the LISST 100X data file In the case of the MicroCat the temperature and depth data from the LISST 100X data elements 37 38 are replaced with the temperature and depth data from the MicroCat and the conductivity data are stored in the auxiliary data element 35 In the case of the OBS 3 or the Turner Designs Cyclops 7 the data are stored in the auxiliary element 35 In order to interface the LISST 100X and the external sensor a new connector endcap is required Therefore the instrument must be returned to Sequoia for this modification please contact us for price and additional information The processing of the LISST size distributions by the Windows software is unaffected by the changes Since the data is transferred digitally there is no loss in performance of the external sensor Sequoia no longer supports the integration of external sensors on the LISST 100 only the LISST 100X Updated 3 14 2011 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

    Original URL path: http://www.sequoiasci.com/article/integration-of-high-accuracy-conductivity-and-temperature-measurements-with-the-lisst-100x/ (2016-02-13)
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  • Articles | Sequoia Scientific
    Calibrating the LISST series instruments Calibrating the LISST series instruments Sequoia April18 2008 this article is identical to Application Note L009 The LISST series of instruments measure particle size distribution i e the volume fraction contained in each of 32 size bins Additionally the instruments deliver The size resolution of the LISST series of instruments The size resolution of the LISST series of instruments Sequoia April18 2008 this article is identical to Application Note L008 The LISST instruments observe the multi angle scattering of light from an ensemble of particles in water This multi parameter measurement is used to How LISST instruments measure the size distribution and concentration of particles How LISST instruments measure the size distribution and concentration of particles Sequoia Scientific April 18 2008 article identical to Application Note L001 Rev 10 2006 LISST instruments represent a new generation of systems for measuring the size distribution and concentration Measuring absolute VSF with LISST 100 Measuring the absolute Volume Scattering Function VSF with LISST 100 Sequoia Scientific April 18 2008 This article describes the formulation that relates the measured multi angle scattered light to the VSF of water The figure shows the basic optical geometry A collimated laser Next Previous Browse By Application Notes Data Processing LISST 100X LISST ABS LISST Deep LISST Holo LISST Portable LISST SL LISST STX MATLAB Scripts Research Troubleshooting 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

    Original URL path: http://www.sequoiasci.com/library/articles/page/8/ (2016-02-13)
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  • LISST-100X | Categories | Sequoia Scientific
    LISST 100X VSF measurement in AIR For the angles in WATER click here Type B Type C Ring Read more mat2tt m May 4 2009 mat2tt m Sequoia May 4 2009 The mat2tt m script converts a matrix with raw data in ASCII format into a binary file with DAT extension that can be read into the LISST SOP for processing It is useful for converting LOG files created Read more LISST bin sizes December 1 2008 LISST Bin Sizes Sequoia December 1 2008 January 6 2009 The LISST manual specifies the bin mid points of the size bins of the particular instrument typically type B or C However for some applications it is necessary to know Read more datenumfromdata m November 5 2008 datenumfromdata m Sequoia November 5 2008 Function to compute date in a year from columns 39 and 40 from the dat file read using tt2mat User must input columns 39 and 40 as an nx2 matrix together with the year Output is Read more LISST concentration limits August 29 2008 What are the concentration limits for a LISST instrument There are really 2 answers to this question The short one and the more elaborate one The short one follows here the elaborate one a bit further down this webpage At the Read more Previous Next 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

    Original URL path: http://www.sequoiasci.com/article_category/lisst-100x/page/7/ (2016-02-13)
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  • Measuring absolute VSF with LISST-100 | Sequoia Scientific
    the elementary receiver solid angle Further attenuation of scattered light occurs by a factor c c l x before reaching the window1 The solid angle dΩ is dS f2 where dS is the area of an elemental ring on a detector that senses light scattered over angle q to q dq and f is the receiving lens focal length Substituting dP e cl P0 A b q dAdxdS f2 But since any ring detects light scattered at the same scattering angle dS 2pf f2qdq where f is the fraction of a circle covered by a detector ring Substituting and integrating we have the power on ring number i as P i òòò e cl P0 A b q dAdx2p f q dq Now if VSF is assumed to be independent of the location of the elementary volume in the water and if we further assume that VSF is a slowly varying function of angle so that it remains constant over the small angle sub range then this is integrated over to P i e cll P0 pfb q q 2 i 1 q2i Now the first exponential factor is recognized as optical transmission t Since there are 32 detectors spanning a radius range 200 1 and detector radii increase logarithmically if r represents the factor 2001 32 ri r i 1qmin so that we have after substitution and some algebra bi q P i P0 1 r 2 r2i p l f t q 2min This is the essential relationship between the power sensed by each silicon ring detector and the VSF averaged over it All quantities in the above formulation are measured with the LISST 100 though the precise magnitude of the laser power P0 and scattered power P i requires the responsitivity of the detectors Let the photo detector response be such that the associated post amplification voltage is V i G i P i and V 0 G 0 P 0 where G is the gain Volts Watt optical power Consequently we have b i q G 0 G i V i V 0 1 r 2 r2i p l f t q2min The purpose of writing the result in the above form is to show that all quantities are measured except the responsitivities G Values of G can be obtained from standards that are traceable to the US National Institute of Standards and Technology NIST With a common A D the ratio V i V 0 can be replaced with the ratio of the corresponding digital counts i e N i N 0 2 Thus the task of measuring the VSF reduces to recording the voltages V i and V 0 The LISST 100 instrument records V i from the 32 ring detectors following an I V amplifier using an overall gain of 0 5V mW optical3 The corresponding sensitivity for the transmission sensor is 1mV mW optical As a final form then for the assumed value of parameters in this example b i q 2

    Original URL path: http://www.sequoiasci.com/article/measuring-absolute-vsf-with-lisst-100/ (2016-02-13)
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  • Articles | Sequoia Scientific
    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 Sequoia Scientific New Product LISST ABS Log In Register Home Library Articles Page 9 Articles Browse By Application Notes Data Processing LISST 100X LISST ABS LISST Deep LISST Holo LISST Portable LISST SL LISST STX MATLAB Scripts Research Troubleshooting 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 ABS April 9 2015

    Original URL path: http://www.sequoiasci.com/library/articles/page/9/ (2016-02-13)
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  • LISST-100X | Categories | Sequoia Scientific
    PS Chant RJ Jago CF Jones SE Krivtsov V Mitchelson Jacob G 2008 The influence Read more Random shaped particles LISSTs July 7 2008 Light scattering by random shaped particles and consequences on measuring suspended sediments by laser diffraction Sequoia July 7 2008 Agrawal YC Whitmire A Mikkelsen OA Pottsmith HC 2008 Light scattering by random shaped Read more Mie theory phase function and LISST 100X measurements May 30 2008 Remarkable agreement is seen between Mie theory phase function and LISST 100X measurement Sequoia May 30 2008 The following data were acquired on 20 July 2006 and selected randomly for a comparison with Mie theory Phase function Read more Processing LISST 100 and LISST 100X data in MATLAB April 30 2008 Sequoia April 30 2008 I INTRODUCTION II SOFTWARE FUNCTIONS II 1 Using the invert p processing file II 2 Using Matlab functions for detailed processing Loading your files Viewing the raw data files Viewing partial results with Read more getscat m April 29 2008 GETSCAT M Sequoia April 29 2008 This article contains the source code for the getscat m file that is used to obtain raw scattering data from a LISST 100 or LISST 100X dat file To use copy and paste all text between the Read more Previous Next 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 Models EcoLight S HydroLight

    Original URL path: http://www.sequoiasci.com/article_category/lisst-100x/page/8/ (2016-02-13)
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