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Applied Optics

Applied Optics


  • Vol. 37, Iss. 22 — Aug. 1, 1998
  • pp: 5162–5168

Dual-hologram shearing interferometry with regulated sensitivity

Gregory R. Toker and Daniel Levin  »View Author Affiliations

Applied Optics, Vol. 37, Issue 22, pp. 5162-5168 (1998)

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A novel optical diagnostic technique, namely, dual-hologram shearing interferometry with regulated sensitivity, is proposed for visualization and measuring of the density gradients of compressible flows in wind tunnels. It is superior to 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 has proved to be insensitive to mechanical vibrations and has allowed us to record holograms during the noisy wind-tunnel run. The proposed approach is demonstrated by application to a supersonic flow over spherically blunted and sharp nose-cone–cylinder models. We believe that the technique will become an effective tool for receiving optical data in many flow facilities.

© 1998 Optical Society of America

OCIS Codes
(090.1000) Holography : Aberration compensation
(090.2880) Holography : Holographic interferometry
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(110.3010) Imaging systems : Image reconstruction techniques

Original Manuscript: January 6, 1998
Revised Manuscript: March 30, 1998
Published: August 1, 1998

Gregory R. Toker and Daniel Levin, "Dual-hologram shearing interferometry with regulated sensitivity," Appl. Opt. 37, 5162-5168 (1998)

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