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    Development and deployment of a precision underwater positioning system for in situ laser Raman spectroscopy in the deep ocean

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    PUP_DSR_final.pdf (2.758Mb)
    Date
    2005-10-25
    Author
    White, Sheri N.  Concept link
    Kirkwood, William  Concept link
    Sherman, Alana  Concept link
    Brown, Mark  Concept link
    Henthorn, Richard  Concept link
    Salamy, Karen  Concept link
    Walz, Peter  Concept link
    Peltzer, Edward T.  Concept link
    Brewer, Peter G.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/415
    As published
    https://doi.org/10.1016/j.dsr.2005.09.002
    Keyword
     Optical instruments; Underwater vehicles; Oceanographic equipment; Raman spectroscopy; Motion control 
    Abstract
    The field of ocean geochemistry has recently been expanded to include in situ laser Raman spectroscopic measurements in the deep ocean. While this technique has proved to be successful for transparent targets, such as fluids and gases, difficulty exists in using deep submergence vehicle manipulators to position and control the very small laser spot with respect to opaque samples of interest, such as many rocks, minerals, bacterial mats, and seafloor gas hydrates. We have developed, tested, and successfully deployed by remotely operated vehicle (ROV) a precision underwater positioner (PUP) which provides the stability and precision movement required to perform spectroscopic measurements using the Deep Ocean In Situ Spectrometer (DORISS) instrument on opaque targets in the deep ocean for geochemical research. The positioner is also adaptable to other sensors, such as electrodes, which require precise control and positioning on the seafloor. PUP is capable of translating the DORISS optical head with a precision of 0.1 mm in three dimensions over a range of at least 15 cm, at depths up to 4000 m, and under the normal range of oceanic conditions (T, P, current velocity). The positioner is controlled, and spectra are obtained, in real time via Ethernet by scientists aboard the surface vessel. This capability has allowed us to acquire high quality Raman spectra of targets such as rocks, shells, and gas hydrates on the seafloor, including the ability to scan the laser spot across a rock surface in sub-millimeter increments to identify the constituent mineral grains. These developments have greatly enhanced the ability to obtain in situ Raman spectra on the seafloor from an enormous range of specimens.
    Description
    Author Posting. © The Authors, 2005. This is the author's version of the work. It is posted here by permission of Elsevier B. V. for personal use, not for redistribution. The definitive version was published in Deep Sea Research Part I: Oceanographic Research Papers 52 (2005): 2376-2389, doi:10.1016/j.dsr.2005.09.002.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Preprint: White, Sheri N., Kirkwood, William, Sherman, Alana, Brown, Mark, Henthorn, Richard, Salamy, Karen, Walz, Peter, Peltzer, Edward T., Brewer, Peter G., "Development and deployment of a precision underwater positioning system for in situ laser Raman spectroscopy in the deep ocean", 2005-10-25, https://doi.org/10.1016/j.dsr.2005.09.002, https://hdl.handle.net/1912/415
     

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