Journal
APPLIED OPTICS
Volume 44, Issue 31, Pages 6653-6659Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.44.006653
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A sensor based on tunable diode laser absorption spectroscopy was constructed for time-resolved temperature and water vapor concentration measurements in a scramjet combustor. The sensor probed two absorption lines near 1390 nm with two time-multiplexed lasers used to measure temperature and water vapor concentration at up to 20 kHz. A demonstration experiment was performed in the supersonic, expanding exhaust region of the combustor, showing the measurement to be repeatable, able to resolve temporal trends during tunnel operation, and sensitive to changes in combustor operating conditions. (c) 2005 Optical Society of America.
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