×

Holographic terrain surface display system

  • US 4,317,610 A
  • Filed: 07/20/1979
  • Issued: 03/02/1982
  • Est. Priority Date: 07/20/1979
  • Status: Expired due to Term
First Claim
Patent Images

1. An apparatus for the visual display of a terrain surface, comprising in combination:

  • means for generating a collimated monochromatic laser light beam;

    means spatially disposed downstream from said laser light beam generating means for expanding said laser light beam to a predetermined cross-sectional area;

    mirror means spatially disposed directly downstream from said means for expanding said laser light beam, and having a signal input;

    a halographic film positioned adjacent to said mirror means and having thereon a plurality of Fraunhofer holograms, each of said plurality of Fraunhofer holograms having therein a plurality of Fraunhofer diffraction patterns;

    said mirror means being adapted for reflecting said laser light beam onto said holographic film such that said laser light beam is incident upon only one of said plurality of Fraunhofer holograms during any time period;

    said mirror means being adapted for varying the angle at which said expanded laser light beam is reflected thereby so as to vary the angle at which said expanded laser light beam is incident upon each of said Fraunhofer holograms;

    each of said Fraunhofer diffraction patterns being correlated to a predetermined angle of incidence of said laser light beam upon said halogram, such that the respective Fraunhofer diffraction pattern is reconstructed at a predetermined image plane when said hologram is illuminated by said laser light beam at said predetermined angle of incidence; and

    means spatially disposed downstream from said holographic film adapted for forming a real image upon receiving the Fraunhofer diffraction pattern for rotating said real image formed thereby so as to modify said real image in an azimuthal direction to allow for the viewing of said real image, and for projecting said modified real image.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×