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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 10, Iss. 12 — Jun. 17, 2002
  • pp: 505–514

Wavelength-agile diode-laser sensing strategies for monitoring gas properties in optically harsh flows: application in cesium-seeded pulse detonation engine

Scott T. Sanders, Daniel W. Mattison, Lin Ma, Jay B. Jeffries, and Ronald K. Hanson  »View Author Affiliations


Optics Express, Vol. 10, Issue 12, pp. 505-514 (2002)
http://dx.doi.org/10.1364/OE.10.000505


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Abstract

The rapid, broad wavelength scanning capabilities of advanced diode lasers allow extension of traditional diode-laser absorption techniques to high pressure, transient, and generally hostile environments. Here, we demonstrate this extension by applying a vertical cavity surface-emitting laser (VCSEL) to monitor gas temperature and pressure in a pulse detonation engine (PDE). Using aggressive injection current modulation, the VCSEL is scanned through a 10 cm-1 spectral window at megahertz rates – roughly 10 times the scanning range and 1000 times the scanning rate of a conventional diode laser. The VCSEL probes absorption lineshapes of the ~ 852 nm D2 transition of atomic Cs, seeded at ~ 5 ppm into the feedstock gases of a PDE. Using these lineshapes, detonated-gas temperature and pressure histories, spanning 2000 – 4000 K and 0.5 – 30 atm, respectively, are recorded with microsecond time response. The increasing availability of wavelength-agile diode lasers should support the development of similar sensors for other harsh flows, using other absorbers such as native H2O.

© 2002 Optical Society of America

OCIS Codes
(300.1030) Spectroscopy : Absorption
(300.2140) Spectroscopy : Emission
(300.6210) Spectroscopy : Spectroscopy, atomic
(300.6260) Spectroscopy : Spectroscopy, diode lasers

ToC Category:
Research Papers

History
Original Manuscript: May 3, 2002
Revised Manuscript: June 13, 2002
Published: June 17, 2002

Citation
Scott Sanders, Daniel Mattison, Lin Ma, Jay Jeffries, and Ronald Hanson, "Wavelength-agile diode-laser sensing strategies for monitoring gas properties in optically harsh flows: application in cesium-seeded pulse detonation," Opt. Express 10, 505-514 (2002)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-10-12-505


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References

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