Importance

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Abstract

A keyless holographic locking device that uses a matched optical filter to store in form of a hologram a unique identificaton such as a fingerprint of an authorized user, a source of coherent light that provides the illumination, and an input element for providing angle-invariance possessing the form of a transparent window against which the user places and rotates the same fingerprint, and a registering device for registering the correlation optical signal between the stored fingerprint and the presented fingerprint to generate a signal to unlock the device when, and only if, a positive correlation exists between the presented and the stored fingerprints. A keyless two-stage holographic locking device, using a generalized matched optical filter wherein additional information for authorization is stored in a reference beam during the preparation of said filter, and wherein a second-stage optical correlation is also performed to register a second correlation between the stored additional information and a second identification presented by the user.

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First Claim