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Proceedings Paper

Holographic And Classical Head Up Display Technology For Commercial And Fighter Aircraft
Author(s): Robert B. Wood; Michael J. Hayford
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Paper Abstract

One of the first Holographic Head Up Display (HHUD) systems developed at Flight Dynamics, Inc. (FDI) was for the Boeing 727 class commercial transport. It has been certified by the FAA for landing operations under Category IIIa conditions and for windshear detection and recovery guidance. The combiner of a prototype exhibited a phenomenon called flare. Flare is most apparent when viewing bright objects in a dark surround, e.g. landing lights at night. It is caused by using Holographic Optical Elements (HOEs) with diffractive power and by HOE construction setups in which the formation of parasitic holograms is not controlled. The problem was solved by using a conformal reflection HOE constructed in a single beam configuration (U.S. Patent 4,582,389). Other HHUD systems have been developed by Flight Dynamics, Inc. for fighter cockpit geometries. Because no structure can protrude past the ejection line, the optical path must be folded forward to clear this area. Since the combiner element must work at substantial (>55°) off-axis angles which introduce large aberrations, a holographic fold element formed using aspheric wavefronts is used to introduce partially compensating aberrations (U.S. Patent 4,669,810). Large aspheric wavefront deformations can be achieved on a component which is manufactured by a replication process, thereby reducing costs.

Paper Details

Date Published: 12 April 1988
PDF: 17 pages
Proc. SPIE 0883, Holographic Optics: Design and Applications, (12 April 1988); doi: 10.1117/12.944123
Show Author Affiliations
Robert B. Wood, Flight Dynamics, Inc. (United States)
Michael J. Hayford, Optical Research Associates (United States)

Published in SPIE Proceedings Vol. 0883:
Holographic Optics: Design and Applications
Ivan Cindrich, Editor(s)

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