Recent Advances in Laser-based Diagnostics for Gaseous Flows

Issue title: International Conference on Optical Technology and Image Processing in Fluid, Thermal, and Combustion Flow, Yokohama, Japan, December 1998

Article type: Research Article

Authors: Hanson, R. | Baer, D. | Morris, C. | Thurber, M. | Furlong, E. | Wehe, S.

Affiliations: Department of Mechanical Engineering, Stanford University, Stanford, CA 94305-3030, USA. e-mail: [email protected]

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.

Keywords: PLIF, diode laser, absorption spectroscopy, combustion control, hypersonic, supersonic, acetone

Journal: Journal of Visualization, vol. 2, no. 3-4, pp. 309-319, 2000