Read-out device for reading out holographically stored information, method for reading out holographically stored information

摘要

Read-out device (100) for determining information (I) stored holographically in a hologram (5) and for determining at least one hologram parameter of the hologram, comprising a narrow-band light source (1) designed to illuminate a hologram (5) in order to to generate a reconstruction (8, 10) of the hologram (5), - a first filter element (6, 6.1) and a second filter element (6, 6.2), the first filter element (6, 6.1) being designed to emit light with a to attenuate first attenuation in order to generate a first local intensity distribution (10 '), and the second filter element (6, 6.2) is designed to attenuate light with a second attenuation in order to generate a second local intensity distribution (10 "), and a sensor (4) with a first area and a second area, the sensor (4) being designed to detect the first and second local intensity distributions (10 ', 10 ") in order to generate a first data signal (7.1) and a second data gnal (7.2) - and an image processing device (9) designed to process the first and second data signals (7.1, 7.2), the first filter element (6, 6.1) and the second filter element (6, 6.2) in such a way are arranged that when the narrow-band light source (1) emits light and thereby the hologram (5) is illuminated and diffracted and reflected light (2) is produced on the hologram, which passes through an optical element (3), whereby the diffracted and reflected Light (2) is Fourier transformed, whereby the reconstruction (8, 10) is generated on the sensor (4), - the sensor (4) in the first area the reconstruction (8, 10) with the first local intensity distribution ( 10 ') and the sensor (4) in the second area detects the reconstruction (8, 10) with the second local intensity distribution (10 "), and the image processing device (9) generates a first hologram from the first data signal (7.1) Parameter (H1) ermi ttelt and from the second data signal (7.2) the information holographically stored in the hologram is determined (I).