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. and 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. (doi:10.1088/0957-0233/12/8/101).

Abstract

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.

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