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Raman Spectroscopy for On-Line Environmental and Atmospheric Analysis Process Instruments Inc., Salt Lake City, UT

Innovation Process Instruments Inc. has developed a full-spectrum Raman scattering instrument, incorporating a multipass external cavity enhancement cell for gas phase analysis of Oxygen and Carbon Dioxide.

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Raman Spectroscopy for On-Line Environmental and Atmospheric Analysis Process Instruments Inc., Salt Lake City, UT

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  1. Innovation • Process Instruments Inc. has developed a full-spectrum Raman scattering • instrument, incorporating a multipass external cavity enhancement cell for • gas phase analysis of Oxygen and Carbon Dioxide. Raman Spectroscopy for On-Line Environmental and Atmospheric AnalysisProcess Instruments Inc., Salt Lake City, UT • Accomplishments • Spectrograph Design: The Raman Specrograph design has reduced both • size and weight of our Raman Spectrograph. In addition, to improving the • signal collection by redesigning the optics placement. This improved design • allows for increased signal collection, and improved signal resolution • while maintaining a smaller foot print. • Laser Lifetime and Improved Stability: Process Instruments Inc. has been able • to improve the stability of our frequency-stabilized lasers by using a low AR • (anti-reflective) coating on the front facet. This coating also allows for • improved frequency tuning. Found a laser diode vendor that can supply Al- • free laser diodes. Process Instruments in house life testing to date indicates that • we can now warrant our lasers for at least one year. This is 4 times longer • than any other similar laser manufacturers. • Commercialization • There has been considerable commercial interest from private companies to assist in Process Instruments Inc. Raman development. An arrangement has been structured to sell a basic instrument prototype in exchange for a company’s financing of our materials and development costs. Process Instruments Inc. acquired $468,000 in funds for basic diode-laser Raman instrumentation development. • Government/Science Applications • A dual wavelength diode laser has been developed for use with one of • upcoming MARS exploratory missions.The dual wavelength laser will allow • a single spectrograph to measure the complete Raman spectra from ~300 cm-1 • to ~4,000 cm-1. A NIR 785 nm laser is used for Raman scattering in the region • of 300 to 2000 cm-1. Exciting with this wavelength reduces fluorescence • problems. Exciting with a visible (670 nm) wavelength laser for the region of • 2000 to 4000 cm-1 takes advantage of improved quantum efficiency. Points of Contact: - NASA Jane Fox; 281-483-4815 - Company Lee Smith; pismith@sisna.com 1996 STTR Phase II; NAS9-98023 Johnson Space Center Date of Update06/26/00 Success Story #09-27

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