15 September 2006 Digital holographic interferometry in a disturbed environment
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Proceedings Volume 6341, Speckle06: Speckles, From Grains to Flowers; 634111 (2006) https://doi.org/10.1117/12.695343
Event: Speckle06: Speckles, From Grains to Flowers, 2006, Nimes, France
Abstract
The problem of environmental disturbances in Digital Holographic Interferometry has been addressed in this investigation. Disturbances may be caused by vibrations, air turbulence or the presence of scattering particles and the effect of them might significantly prevent spread of the technique into a wider area of application. To handle the problem with air turbulence a temporal sequence of an event is analysed and the effect on the motion and phase of the speckles is analysed and described using statistical measures. The effect of the medium will be fed back to the sequence using an adaptive filter and the undisturbed phase evolution estimated. The principle is demonstrated using a heat source placed in between the object and the CCD camera as the disturbance on a simple tilt experiment. The presence of scattering particles is more intriguing and has to be dealt with separately. In this investigation we adopt the technique of low-coherence interferometry to depth-code the holographic images acquired. The seeding of the pulsed Nd:YAG laser source used is shut off that results in a coherence length of about one cm. The paper shows a few preliminary results from a simple wavepropagation experiment.
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Henrik Lycksam, Per Gren, Mikael Sjödahl, "Digital holographic interferometry in a disturbed environment", Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 634111 (15 September 2006); doi: 10.1117/12.695343; https://doi.org/10.1117/12.695343
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