6 July 1998 Dual-hologram shearing interferometry with regulated sensitivity
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Abstract
A novel optical diagnostic technique, namely, a dual hologram shearing interferometry with regulated sensitivity, is proposed for visualization and measuring the density gradients of compressible flows in wind tunnels. It has advantages over conventional shearing interferometry in both accuracy and sensitivity. The method is especially useful for strong turbulent or unsteady regions of the flows including shock flows. The interferometer proved to be insensitive to mechanical vibrations and allowed to record holograms during the noisy wind tunnel run. The proposed approach was demonstrated by its application to a supersonic flow over spherically blunted and sharp nose cone/cylinder models. It is believed that the technique will become an effective tool for receiving optical data in many flow facilities.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gregory R. Toker, Daniel Levin, "Dual-hologram shearing interferometry with regulated sensitivity", Proc. SPIE 3479, Laser Interferometry IX: Applications, (6 July 1998); doi: 10.1117/12.316453; https://doi.org/10.1117/12.316453
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