Hypervelocity Particle Measurements By A Holographic Method

Max L.A. Gassend; Wolfgang M. Boerner

doi:10.1117/12.955200

14 September 1977 Hypervelocity Particle Measurements By A Holographic Method

Max L.A. Gassend, Wolfgang M. Boerner

Proceedings Volume 0097, 12th Intl Congress on High Speed Photography; (1977) https://doi.org/10.1117/12.955200
Event: 12th International Congress on High Speed Photography, 1976, Toronto, Canada

Abstract

The object of this paper is to present a new holographic method that permits three-dimensional imaging of hypervelocity particle fields with pulse lasers generating pulses having relatively long pulse durations. Dense and/or deep scenes can be imaged, since the temporal filtering properties of holograms permit discrimination between the region of the scene which is of interest and the unwanted region. The holographic configuration embodies a pulse laser source, a three-mirror reflector, a rotating mirror and a holocamera**. The rotating mirror compensates for the scene motion during exposure and the holocamera generates a local reference beam by either amplitude/ wavefront division or spatial frequency component separation method . The role of the three-mirror reflector is to provide an illuminating beam having a time invariant direction in the image space of the rotating mirror. It is shown that this method permits recovery of the three-dimensional velocity vector of each particle, even though the magnitude of the average velocity vector of the particles is much larger than that of the individual relative velocity vector of each particle with respect to another one. Substantial gain in accuracy is gained by using holocameras recording dark-field images. A theoretical study of the method and some results obtained by laboratory simulation are presented.

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Max L.A. Gassend and Wolfgang M. Boerner "Hypervelocity Particle Measurements By A Holographic Method", Proc. SPIE 0097, 12th Intl Congress on High Speed Photography, (14 September 1977); https://doi.org/10.1117/12.955200

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KEYWORDS

Mirrors

Particles

Holography

3D image reconstruction

Fourier transforms

Laser sources

Retroreflectors

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