公开(公告)号：US20200233377A1

公开(公告)日：2020-07-23

申请号：US16652081

申请日：2018-10-16

Applicant: RENISHAW PLC

Inventor： Nicholas John WESTON ,  Duncan Paul HAND ,  Krystian Lukasz WLODARCZYK

IPC: G03H1/00 ,  G03H1/08 ,  G03H1/30

Abstract: A method and system for forming a holographic structure in a material. The holographic structure is configured to project a selected target image in the far field under illumination of the holographic structure by a laser. The method calculates a modified design for the holographic structure that encodes a unique identifier within the holographic structure for projecting the target image. The method modifies the material by mapping features corresponding to the modified design into the material so as to form the holographic structure. A basic check of the authenticity of the material is performed by checking whether a projected replica of the target image is as expected. A more detailed check of the authenticity of the material is performed by directly inspecting the features in the holographic structure.