Investigation of speckles produced from surfaces of some materials used in automotive industries with different wavelengths

Hatem El-Ghandoor

doi:10.1117/12.185318

8 September 1994 Investigation of speckles produced from surfaces of some materials used in automotive industries with different wavelengths

Hatem El-Ghandoor

Author Affiliations +

Proceedings Volume 2358, First International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1994) https://doi.org/10.1117/12.185318
Event: Vibration Measurements by Laser Techniques: First International Conference, 1994, Ancona, Italy

Abstract

The aim of this work is to present an overview about the speckles produced from many surfaces used in automotive industries using different illuminating wavelengths e.g. white light, Hg and Na light sources. In order to minimize the effect of the reflected speckle grains from such surfaces one has to calculate the speckle grain size and contrast at different wavelengths and the visibility of interference fringes obtained and also the roughness of the rough surface used. The speckles recorded at different angle of incidence for light used to achieve the proper scattering angles which gives minimum speckle brightness causing distortion of the formed image for a moment. Speckles produced from non-spectral light sources were photographed also to identify the difference between such pattern and the speckle pattern obtained with He- Ne laser light source and purely spectral light sources. The visibility of the interference fringe pattern obtained by speckle photography technique with different wavelengths has been investigated experimentally and theoretically.

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Hatem El-Ghandoor "Investigation of speckles produced from surfaces of some materials used in automotive industries with different wavelengths", Proc. SPIE 2358, First International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (8 September 1994); https://doi.org/10.1117/12.185318

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