Accession Number : ADA113982

Title :   Design Study for a Low-Distortion Holographic HUD.

Descriptive Note : Final technical rept. Jul 80-Aug 81,


Personal Author(s) : Colburn,W S ; Fairchild,R C

PDF Url : ADA113982

Report Date : Jan 1982

Pagination or Media Count : 104

Abstract : A design investigation was conducted for a low-distortion holographic HUD optical system. Distortion correction was based on the use of a holographic combiner made with analytically defined construction wavefronts, wavefronts for which the phase at the hologram is described by means of a mathematical expression such as a power series expansion. Such wavefronts are designed subsequent to the hologram design, and offer great design flexibility as their realization is based in part on the use of computer generated holograms. A method is described for designing the construction wavefronts of a holographic optical element based on minimizing the mean-squared wavefront error while satisfying the Bragg condition. A holographic HUD optical system was designed for the F-16 cockpit in which distortion was corrected optically through simultaneous optimization of combiner and relay lens parameters. Both construction wavefronts of the combiner were described in terms of Legendre polynomial series. A detailed and complete description of the construction wavefronts is included, with ray traces indicating the shapes of the wavefronts. The system design met the distortion goal of 0.5%, or less, over most of the instantaneous field-of-view (12 deg. V x 20 deg. H); design results are presented, including distortion, ray errors, and hologram efficiency. A discussion is included of the implementation of construction beams required to form the combiner construction wavefronts. (Author)

Descriptors :   *Head up displays, *Holography, *Holograms, Distortion, Low level, Wavefronts, Optical equipment components, Aspherical lenses, Visual perception, Accuracy, Configuration management, Aircraft equipment

Subject Categories : Holography

Distribution Statement : APPROVED FOR PUBLIC RELEASE