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http://bura.brunel.ac.uk/handle/2438/2821
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. |
URI: | http://bura.brunel.ac.uk/handle/2438/2821 |
ISSN: | 0277-786X |
Appears in Collections: | Electronic and Computer Engineering Dept of Electronic and Electrical Engineering Research Papers |
Files in This Item:
File | Description | Size | Format | |
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SPIE_4659.pdf | 420.67 kB | Adobe PDF | View/Open |
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