| 摘要 |
The invention relates to a system for controlling controlled access for a user by checking a defined physical element, in an optical context and at a low power level, comprising: an assembly (1) for the creation of arbitrary spatial light patterns, with amplitude and phase control, comprising a light source (9) that emits a light beam towards a first microscope lens (11), and a spatial light modulator unit (2) which receives the light from the first microscope lens (11) and which spatial light modulator unit (2) transmits a profile that is modulated in terms of amplitude and phase, which form an image at a beam splitter BS (17) that divides the image towards an initial camera CCD (6) and a second microscope lens (12); a defined physical element (7) which receives the initial image from the second microscope lens (12) and transmits the image, without diffracting it, as a final image to a third microscope lens (13); a final camera CCD (8) which receives the final image from the third microscope lens (13) and transmits same to a computer (300) which compares said final image with the initial image, and carries out a calculation of similarity between both images in order to decide to grant the access to the user, if the similarity is greater than a predefined value, and deny the access in the event that the similarity is less than a predefined value; a method for controlling controlled access which compares a pattern of points transmitted via the defined physical element, which codify the numbers 0-9 and decides to grant or deny access if they coincide with the key entered by the user. |
