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

Watson, J.; Alexander, S.; Craig, G.; Hendry, D.C.; Hobson, P.R.; Lampitt, R.S.; Marteau, J.M.; Nareid, H.; Player, M.A.; Saw, K.; Tipping, K.. 2001 Simultaneous in-line and off-axis subsea holographic recording of plankton and other marine particles. Measurement Science and Technology, 12. L9-L15. https://doi.org/10.1088/0957-0233/12/8/101

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Abstract/Summary

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 cm3 of the water column in a single off-axis hologram and 3500 cm3 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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1088/0957-0233/12/8/101
ISSN:	0957-0233
Additional Keywords:	optical holography, in-line holography, off-axis holography, holographic camera, underwater light, plankton
Date made live:	11 Sep 2008 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/163116

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