Extension of the small-aperture beam technique to the measurement of full two-dimensional optical wavefronts

Edward J. Fitzgerald; Eric J. Jumper

doi:10.1117/12.293388

21 November 1997 Extension of the small-aperture beam technique to the measurement of full two-dimensional optical wavefronts

Edward J. Fitzgerald, Eric J. Jumper

Author Affiliations +

Proceedings Volume 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III; (1997) https://doi.org/10.1117/12.293388
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

Variable-density flows create time- and space-varying aberrations in optical wavefronts passing through them. Such aberrations significantly degrade the performance of instruments using this optical 'information'. Since fluid turbulence causes the distortions,they also contain information about the flow that created them. A high speed, optical wavefront sensor would thus be useful both as a means of cuing adaptive-optics systems and for non- intrusive, turbulent flow diagnostics. This paper presents the first effort to develop a high speed, 2D wavefront sensor based on the theory for the 1D, small-aperture beam technique (SABT). The new sensor uses the SABT for measurements in the streamwise direction and scanned beams for cross-stream wavefront measurements. Results of a breadboard implementation of the cross-stream component are presented followed by preliminary result for the full, 2D, SABT-derivative sensor measurements of a low-speed, heated mixing layer.

Citation Download Citation

Edward J. Fitzgerald and Eric J. Jumper "Extension of the small-aperture beam technique to the measurement of full two-dimensional optical wavefronts", Proc. SPIE 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III, (21 November 1997); https://doi.org/10.1117/12.293388

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