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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 16 — Jun. 1, 2007
  • pp: 3345–3351

Fiber optic Raman sensor to monitor the concentration ratio of nitrogen and oxygen in a cryogenic mixture

Vidhu S. Tiwari, Rajamohan R. Kalluru, Fang Y. Yueh, Jagdish P. Singh, William St. Cyr, and Sunil K. Khijwania  »View Author Affiliations


Applied Optics, Vol. 46, Issue 16, pp. 3345-3351 (2007)
http://dx.doi.org/10.1364/AO.46.003345


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Abstract

A spontaneous Raman scattering optical fiber sensor was developed for a specific need of the National Aeronautics and Space Administration (NASA) for long-term detection and monitoring of the purity of liquid oxygen ( LO 2 ) in the oxidizer feed line during ground testing of rocket engines. The Raman peak intensity ratios for liquid nitrogen ( LN 2 ) and LO 2 with varied weight ratios ( LN 2 / LO 2 ) were analyzed for their applicability to impurity sensing. The study of the sensor performance with different excitation light sources has helped to design a miniaturized, cost-effective system for this application. The optimal system response time of this miniaturized sensor for LN 2 / LO 2 measurement was found to be in the range of a few seconds. It will need to be further reduced to the millisecond range for real-time, quantitative monitoring of the quality of cryogenic fluids in a harsh envioronment.

© 2007 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(140.3550) Lasers and laser optics : Lasers, Raman
(170.5660) Medical optics and biotechnology : Raman spectroscopy
(300.0300) Spectroscopy : Spectroscopy
(300.6330) Spectroscopy : Spectroscopy, inelastic scattering including Raman

ToC Category:
Spectroscopy

History
Original Manuscript: August 22, 2006
Revised Manuscript: February 13, 2007
Manuscript Accepted: February 15, 2007
Published: May 15, 2007

Citation
Vidhu S. Tiwari, Rajamohan R. Kalluru, Fang Y. Yueh, Jagdish P. Singh, William St. Cyr, and Sunil K. Khijwania, "Fiber optic Raman sensor to monitor the concentration ratio of nitrogen and oxygen in a cryogenic mixture," Appl. Opt. 46, 3345-3351 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-16-3345


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References

  1. R. Parry, G. Claborn, A. Haas, R. Landis, W. Pages, and J. Smith, "A high reliability oxygen deficiency monitoring system," presented at the Particle Accelerator Conference, Washington D.C., 17-20 May 1993.
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