Development and deployment of a precision underwater positioning system for in situ laser Raman spectroscopy in the deep ocean
White, Sheri N.
Peltzer, Edward T.
Brewer, Peter G.
MetadataShow full item record
KeywordOptical instruments; Underwater vehicles; Oceanographic equipment; Raman spectroscopy; Motion control
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.
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.
Suggested CitationPreprint: 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
Showing items related by title, author, creator and subject.
White, Sheri N.; Brewer, Peter G.; Peltzer, Edward T. (2004-10-29)A new deep-sea laser Raman spectrometer (DORISS – Deep Ocean Raman In Situ Spectrometer) is used to observe the preferential dissolution of CO2 into seawater from a 50%-50% CO2-N2 gas mixture in a set of experiments that ...
Hester, K. C.; Dunk, R. M.; White, Sheri N.; Brewer, Peter G.; Peltzer, Edward T.; Sloan, E. D. (2006-11-14)Oceanic gas hydrates have been measured near the seafloor for the first time using a seagoing Raman spectrometer at Hydrate Ridge, Oregon, where extensive layers of hydrates have been found to occur near the seafloor. All ...
Laser Raman spectroscopy as a technique for identification of seafloor hydrothermal and cold seep minerals White, Sheri N. (2008-11)In situ sensors capable of real-time measurements and analyses in the deep ocean are necessary to fulfill the potential created by the development of autonomous, deep-sea platforms such as autonomous and remotely operated ...