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      Multichannel photomultiplier for multipass thomson scattering diagnostics

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      Brazilian Journal of Physics
      Sociedade Brasileira de Física

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          Abstract

          The application of a new multichannel 64 parallel amplification 10 stage photomultiplier arranged in 8 x 8 matrix of 20.32 mm x 20.32 mm, detector XP1752 from Philips, for laser light scattering diagnostics is now under development. Signal intensity calibration curve for eight parallel and individual channels, as well as cross talk between channels was measured. Also, Rayleigh scattering on nitrogen gas, normally used as optical calibration method for electron density measurements in Thomson scattering was realized, and the intensity of both detectors was compared making measurements with a tungsten lamp.

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          Local characterization of hindered Brownian motion by using digital video microscopy and 3D particle tracking

          In this article we present methods for measuring hindered Brownian motion in the confinement of complex 3D geometries using digital video microscopy. Here we discuss essential features of automated 3D particle tracking as well as diffusion data analysis. By introducing local mean squared displacement-vs-time curves, we are able to simultaneously measure the spatial dependence of diffusion coefficients, tracking accuracies and drift velocities. Such local measurements allow a more detailed and appropriate description of strongly heterogeneous systems as opposed to global measurements. Finite size effects of the tracking region on measuring mean squared displacements are also discussed. The use of these methods was crucial for the measurement of the diffusive behavior of spherical polystyrene particles (505 nm diameter) in a microfluidic chip. The particles explored an array of parallel channels with different cross sections as well as the bulk reservoirs. For this experiment we present the measurement of local tracking accuracies in all three axial directions as well as the diffusivity parallel to the channel axis while we observed no significant flow but purely Brownian motion. Finally, the presented algorithm is suitable also for tracking of fluorescently labeled particles and particles driven by an external force, e.g. electrokinetic or dielectrophoretic forces.
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            Author and article information

            Journal
            bjp
            Brazilian Journal of Physics
            Braz. J. Phys.
            Sociedade Brasileira de Física (São Paulo, SP, Brazil )
            0103-9733
            1678-4448
            March 2002
            : 32
            : 1
            : 54-57
            Affiliations
            [02] São José dos Campos SP orgnameINPE orgdiv1LAP Brazil
            [01] Campinas SP orgnameUniversidade Estadual de Campinas orgdiv1Instituto de Física 'Gleb Wataghin' Brazil
            Article
            S0103-97332002000100011 S0103-9733(02)03200111
            10.1590/S0103-97332002000100011
            f8e0552b-f797-46c9-b5fb-3a3799d7485a

            This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

            History
            : 26 June 2001
            Page count
            Figures: 0, Tables: 0, Equations: 0, References: 10, Pages: 4
            Product

            SciELO Brazil

            Self URI: Full text available only in PDF format (EN)

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