Instrumentation and sensor development
Ocean Raman In-Situ Spectrometer (DORISS)
Project Manager: Bill Kirkwood
Lead Scientist: Peter Brewer
Engineer: Kent 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
- 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.