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Title: The development and sea trials of a subsea holographic camera for large volume in-situ recording of marine organisms
Authors: Watson, J
Alexander, S
Craig, G
Hendry, DC
Hobson, PR
Lampitt, RS
Marteau, JM
Nareid, H
Nebrensky, JJ
Player, MA
Saw, K
Tipping, K
Keywords: Holography;Underwater Camera;Plankton;Nd-YAG laser
Issue Date: 2002
Publisher: SPIE
Citation: Proceedings of SPIE. 4659(2002) 69-75.
Abstract: We describe the development, construction and sea testing of an underwater holographic camera (HoloCam) for in situ recording of marine organisms and particles in large volumes of sea water. HoloCam comprises a laser, power supply, holographic recording optics and plate holders, a water-tight housing and a support frame. Added to this are control electronics such that the entire camera is remotely operable and controllable from ship or dock-side. Uniquely the camera can simultaneously record both in-line and off-axis holograms using a pulsed frequency doubled Nd-YAG laser. In-line holography is capable of producing images of organisms with a resolution of better than 10 Pm (at concentrations up to a few thousand per cubic centimetre at the smallest sizes). Off-axis holograms of aquatic systems of up to 50,000 cm3 volume, have been recorded. Following initial laboratory testing, the holo-camera was evaluated in an observation tank and ultimately was tested in Loch Etive, Scotland. In-line and off-axis holograms were recorded to a depth of 100 m. We will present results on the test dives and evaluation of the camera performance.
ISSN: 0277-786X
Appears in Collections:Electronic and Computer Engineering
Dept of Electronic and Computer Engineering Research Papers

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