Method of reading hologram information

Optical: systems and elements – Holographic system or element – Authentication

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359 15, 359 25, 359900, 235457, 235470, G03H 100

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active

055350232

ABSTRACT:
A method of photoelectrically reading information recorded in the form of a Fresnel hologram, which makes it possible to eliminate the effect on the reading accuracy of a scratch, a stain, etc., on the hologram surface when the recorded information is reconstructed by applying a light beam having a small diameter to the hologram. The surface of the hologram is illuminated by scanning it with a light beam having a cross-section smaller than the hologram recording region, thereby reconstructing and reading the same recorded information separately from different hologram regions, and thus compensating for momentary disability to reconstruct the recorded information due to a scratch or stain. At the same time, since a light beam having a small beam diameter is used for reconstruction, the depth of focus of the reconstructed image increases, so that the number of restrictions on the installation position of the read sensor decreases.

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K. Hacking, "Some Experiments in Digital Holographic Recording", Proceedings of the Conference on Video and Data Recording, Jul. 27, 1979, University of Southampton, Hants, UK, pp. 329-338.

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