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Proceedings Paper

Suppressing Display Cockpit Reflections
Author(s): Rudolf Hartmann
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Paper Abstract

Modern aircraft displays with relatively high visual brightness levels present day and night sensor images (generated by electro-optical systems) to crew members for navigation and fire control purposes. A heads out display (HOD) on a cathode ray tube (CRT) screen, while effective for one crew member, may distract or irritate another crew member if the image is reflected off a canopy panel into his eyes, particularly at night. This paper presents one solution applied to canopy reflection suppression encountered in the U.S. Army's APACHE Advanced Attack Helicopter where the co-pilot's HOD reflections interfered with the pilot's vision. When the co-pilot would move his head away from the screen, the reflected image path to the pilot, sitting above and behind the co-pilot, would no longer be blocked and distract him. A variety of polarizers were studied and the problem was solved by placing a linear polarizer over the CRT with its axis crossed relative to the skipping vector of the reflection, letting the canopy panel act as an analyzer. Reflected luminance was reduced by more than 25 times.

Paper Details

Date Published: 17 September 1987
PDF: 6 pages
Proc. SPIE 0778, Display System Optics, (17 September 1987); doi: 10.1117/12.940464
Show Author Affiliations
Rudolf Hartmann, Martin Marietta Aerospace (United States)

Published in SPIE Proceedings Vol. 0778:
Display System Optics
Arthur Cox; Rudolf Hartmann, Editor(s)

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