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Instrumentation and sensor development


Deep Ocean Raman In-Situ Spectrometer (DORISS)
(formerly LRS)

Project Manager: Bill Kirkwood
Lead Scientist: Peter Brewer

Lead Engineer: Rich Henthorn

The second development phase of the Deep Ocean Raman In-Situ Spectrometer (DORISS) aims to make innovative scientific use of the system, to enhance the system to achieve its full potential; and to explore future development of lighter, smaller, robust systems for use on other research platforms. To accomplish these goals, a number of engineering enhancements are planned for 2003. 

  • Develop the precision underwater positioner (PUP), a system to position the laser remote head to 
    0.1 millimeter accuracy in-situ.
  • Adapt an existing camera system for through-the-lens (TTL) visualization so that the target being measured can be clearly identified. 
  • Design and build a larger probe head pressure case to accommodate the TTL adaption. 
  • Design and integrate new optical probe head capabilities and sampling techniques.
  • Add white-light sample illumination, either with an external LED ring, or by using a beam splitter in the optical path. 
  • Add a controllable light shutter in the optical path to minimize dissociation of hydrates or photo-bleaching of targets. 
  • Add In situ instrument temperature and humidity measurements to the spectral data that is shared with  other scientific institutions. 
  • Explore the incorporation of a diamond local standard (insensitive to temperature and pressure) in the optical head sensing path to provide a comparison standard for spectrograms.
  • Explore using a Teflon capillary waveguide (liquid core optical fiber) and silver surface-enhanced Raman scattering (SERS) techniques for signal enhancement in sea water.