This paper describes the possibilities and the limits of physics for computer generated holograms (CGHs) used as a small data carrier and security hologram. Security holograms are well known and established. Basically these holograms are produced as batches. That makes it efficient for counterfeiters to reproduce these holograms. This gap is closed by the technology of individualized holograms. In particular, individualized computer generated holograms (CGH) have excellent properties to solve this task, and can also do much more.
The holograms discussed are calculated as Fourier holograms using a fast algorithm. The calculation is optimized for contrast of the readout pattern and recognition of machine readable information by using dedicated software. The information is coded in a holographic pattern as a projection hologram or machine readable information. The manufacturing process will be described by an ultra fast lithographic system, writing small holograms in one second. The holographic materials used here are polymeric foils that do not need any chemical processing.
The physical limits of reflection- and transmission holograms will be discussed in detail. Representative examples will be shown.
The application, a smart data carrier, for product tracing and fraud protection will be illustrated with different examples. Different variations of reading the analogue- or machine readable information will be shown.
You may also like:
- Improvement of direct fringe printer for computer-generated holograms
- Development of the surface diffraction method for computer-generated display holograms
- Large format digital colour holograms produced using RGB pulsed laser technology
- Practical method for color computer-generated rainbow hologram of real-existing objects
- Improve on the uniformity of reconstructed output from computer generated hologram with a pre-compensate method
Loading ...
0 Response to “Small individual computer generated holograms, produced in one second”