An Improved Method of Investigation of Compressor Blade Fit Using Holographic Interferometry
Aircraft structures technical memo.,
AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)
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Holography is a technique which has many scientific applications, and is now gaining acceptance in industry. It enables the recording of three- dimensional information about an object on a two-dimensional medium. Currently used methods of taking holograms rely on the recording the interference pattern which is generated when light from a coherent monochromatic source is split into two, or sometimes more beams, and the are recombined at the recording medium. One of the beams is reflected, or scattered from the object. As the source is coherent, the recombined beams interfere, and the resulting interference pattern is stored by the recording medium. The stored interference pattern can be used to reconstruct a three-dimensional optical field of the object. The light reaching the recording medium after reflection by the object is called the object or subject beam, the split off portion with which it interferes at the recording medium is called the reference beam.
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