Abstract
Tunable diode laser (TDL) absorption has proven highly effective for time-resolved in situ sensing of gaseous flows, and as a result such sensors are utilized increasingly in the development and control of advanced propulsion and combustion systems. Sensors using TDL absorption along a line-of-sight have the capability of fast or even continuous measurements of multiple flowfield quantities. Recent advances in TDL absorption-based sensors suggest excellent potential for development into routine diagnostic tools for a wide variety of ground-test applications. From research in our laboratory we select three aspects: (1) the development of wavelength-multiplexed absorption concepts, allowing multiple measurements along each line-of-sight; (2) ground-test applications of TDL absorption to pulse detonation engines, gas turbine sector rigs, and scramjet combustor research; and (3) extension of wavelength-multiplexed TDL sensing to hydrocarbon fuels using new wavelength-tunable mid-IR lasers.
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