Instantaneous 2D velocity and temperature measurements in high speed flows based on spectrally resolved molecular Rayleigh scattering | Zendy

Richard G. Seasholtz | Zendy

Open Access

Instantaneous 2D velocity and temperature measurements in high speed flows based on spectrally resolved molecular Rayleigh scattering

Author(s) -

Richard G. Seasholtz

Publication year - 1995

Publication title -

33rd aerospace sciences meeting and exhibit

Language(s) - English

Resource type - Conference proceedings

DOI - 10.2514/6.1995-300

Subject(s) - rayleigh scattering , scattering , temperature measurement , materials science , computational physics , light scattering , physics , optics , mechanics , thermodynamics

A Rayleigh scattering diagnostic for high speed flows is described for the simultaneous, instantaneous measurement of gas temperature and velocity at a number (up to about one hundred) of locations in a plane illuminated by an injection-seeded, frequency doubled Nd:YAG laser. Molecular Rayleigh scattered light is collected and passed through a planar mirror Fabry-Perot interferometer. The resulting image is analyzed to determine the gas temperature and bulk velocity at each of the regions. The Cramer Rao lower bound for measurement uncertainty is calculated. Experimental data is presented for a free jet and for preliminary measurements in the Lewis 4 inch by 10 inch supersonic wind tunnel.

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