Optical holography provides non-intrusive, non-destructive recording of living, motile organisms and particles in their natural environment. High-resolution, three-dimensionality and 'optical sectioning' of the image allow identification of species and enumeration of size, orientation and spatial distribution. We have developed a submersible holographic camera to simultaneously expose in-line and, uniquely, off-axis holograms to record organisms from a few micrometres upwards (in-line), in concentrations down to a few tens of particles per cubic metre (off-axis). It can record up to 50 000 cm 3 of the water column in a single off-axis hologram and 3500 cm 3 in an in-line hologram. We describe the first sea deployment of the camera and the successful recording of holograms of Plankton and marine snow to a depth of 100 m water.


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    Title :

    Simultaneous in-line and off-axis subsea holographic recording of plankton and other marine particles


    Additional title:

    Unterwasser-holographische Aufzeichnung von Plankton und anderen maritimen Partikeln


    Contributors:
    Watson, J. (author) / Alexander, S. (author) / Craig, G. (author) / Hendry, D.C. (author) / Hobson, P.R. (author) / Lampitt, R.S. (author) / Marteau, J.M. (author) / Nareid, H. (author) / Player, M.A. (author) / Saw, K. (author)

    Published in:

    Publication date :

    2001


    Size :

    7 Seiten, 5 Bilder, 2 Tabellen, 28 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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