Recent advances in laser-based diagnostics for gaseous flows |
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Authors: | R Hanson D Baer C Morris M Thurber E Furlong S Wehe |
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Institution: | 1. Department of Mechanical Engineering, Stanford University, 94305-3030, Stanford, CA, USA
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Abstract: | Laser-based diagnostic techniques offer unique capabilities for experimentation on gaseous flows. In this paper, we overview recent progress of two concepts: spectrally resolved absorption and planar laser-induced fluorescence (PLIF) imaging. The absorption measurements utilize tunable diode lasers (TDLs) as light sources. Recent TDL applications include a wavelength-multiplexed system for rapid temperature sensing for use in combustion control, and absorption probes for time-resolved measurements of temperature, velocity and species concentrations in a hypersonic shock tunnel. Recent PLIF work includes applications to supersonic, exothermic flowfields relevant to ram accelerators, and development of a method for imaging temperature in air flows using acetone seeding. |
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