High-speed interferometric measurement of aerodynamic phenomena

Details High-speed interferometric measurement of aerodynamic phenomena High-speed interferometric measurement of aerodynamic phenomena

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1221..394s&link_type=abstract

IN: Propagation of high-energy laser beams through the earth's atmosphere; Proceedings of the Meeting, Los Angeles, CA, Jan. 15-

Physics

Optics

Atmospheric Turbulence, Optical Measurement, Optical Paths, Projectiles, Shock Waves, Supersonic Speed, Acousto-Optics, Analog To Digital Converters, Mach-Zehnder Interferometers, Phase Shift, Pixels, Spatial Resolution

Scientific paper

The cross-sections of high-speed aerodynamic phenomena are presently measured by means of a system that interferometrically ascertains optical path length changes with high spatial resolution. Attention is given to the optical disturbance through an aerocurtain, and to the shock wave produced by a hypersonic projectile. While the slowest repetition rate of the laser, camera, and data recorder determines the time-frame rate, the combination of the camera and data recorder determines the spatial resolution. The technique is the spatial equivalent of phase-shifting interferometry. The real-time hardware employed is discussed.

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