Devices for recording or reading out an encoded hologram
AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsDietmar Eberhard, Wolfgang Riedel, Dominik Giel, Karsten Sassenscheid
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Abstract
The invention relates devices for recording or reading out an encoded hologram. Said devices are arranged to record or to read out spatially separated data structures, as well as mutually spatially separated data holograms (36) and positioning holograms (37) associated with positioning structures that are structurally simple compared to the data structures. Said positioning holograms (37) can be analyzed separately from the data holograms (36) in order to align a modulation pattern in an iteration. The hologram can thus be correctly aligned relatively easily even in the event of complex data structures or modulation structures.
Claims14
1-9. (canceled)
A device for recording an encoded hologram, comprising:
- a radiation source generating coherent output radiation along a path;
- an object in said path of said output radiation and containing, in a hologram, a data structure that is to be encoded;
- a modulator in said path of said output radiation, said modulator impressing a modulation pattern on said output radiation;
- and
- a hologram carrier to which a data hologram associated with said data structure can be written, the output radiation modulated by said data structure and the output radiation modulated by said modulation pattern being superimposed, said hologram carrier including a positioning hologram having a positioning structure that is structurally simple relative to said data structure, said modulation pattern and said hologram carrier being shiftable relative to one another.
A device for reading out an encoded hologram, comprising:
- a radiation source generating coherent output radiation along a path;
- a modulator in said path of said output radiation, said modulator impressing a modulation pattern on said output radiation;
- a hologram carrier containing a data hologram associated with a data structure and in said path of said output radiation modulated by said modulator, said hologram carrier further comprising a positioning hologram having a positioning structure that is structurally simple relative to said data structure, said modulation pattern and said hologram carrier shiftable in dependence on the image quality of said positioning structure;
- and
- an image receiving unit acquiring an image of said data structure.
Dependencies are inferred from the claim text.