Applications Of High Speed Holography

K. A. Haines

doi:10.1117/12.975581

1 September 1987 Applications Of High Speed Holography

K. A. Haines

Proceedings Volume 0674, 17th Intl Congress on High Speed Photography and Photonics; (1987) https://doi.org/10.1117/12.975581
Event: 17th International Conference on High Speed Photography and Photonics, 1986, Pretoria, South Africa

Abstract

Holography has been used to record high speed events for the past 20 years. The events include particle and projective impacts, particle dispersion, and a variety of flow field configurations of interest in aerodynamics. Most of these studies and the ones discussed in this article, use either ruby lasers or neodymium YAG lasers, with pulse durations of 10 to 20 nanoseconds. Holography is important for particle dispersion studies because the particle locations, shapes and velocities can be examined three dimensionally after the event has passed. Examples occur in the examination of fuel spray jets and liquid droplet breakup. Holography is ideal for the study of flows in wind tunnels because of its ability to capture the phase of the coherent light transmitted through these fields. Several rather elaborate holographic interferometer methods have been implemented including double pulse, finite fringe, and phase cancellation. Two recent and ongoing programs which also use hologram interferometry are of special interest. The first of these is a study of the imaging capabilities through the turbulent boundary layers which exist over optical windows in high speed aircraft. Recent findings show that some corrections for this turbulence are possible. The second program deals with the analysis of the three dimensional flow field about a rotating helicopter blade. It is interesting because it combines holographic flow field analysis with computed tomography.

Citation Download Citation

K. A. Haines "Applications Of High Speed Holography", Proc. SPIE 0674, 17th Intl Congress on High Speed Photography and Photonics, (1 September 1987); https://doi.org/10.1117/12.975581

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