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Proceedings Paper

Simulating the degraded visual environment: aeromedical assistance to an HMD research program
Author(s): John S. Crowley; Phillip A. Johnson; Melissa H. Ledford; Clarence E. Rash
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Paper Abstract

In order to conduct helmet-mounted display (HMD) helicopter research flights in daylight, two versions of a simulated degraded visual environment (SDVE) were developed. SDVE-1 consisted of a tailored fire-retardant black cloth hood that is draped over the pilot's helmeted head and ventilated with a standard personal ventilator. While SDVE-1 successfully eliminated troublesome reflections, improved display readability, and was reasonably comfortable, pilots reported disturbing sensations of sensory deprivation and isolation. SDVE-2 combined colored filters on the hood and helicopter windscreen to allow the pilot a view of the cockpit interior while blocking light from the external environment. This system has been well accepted and has facilitated safe in- flight HMD research. Motion sickness remains an issue in HMD flight performance research.

Paper Details

Date Published: 12 July 1999
PDF: 9 pages
Proc. SPIE 3689, Helmet- and Head-Mounted Displays IV, (12 July 1999); doi: 10.1117/12.352844
Show Author Affiliations
John S. Crowley, U.S. Army Aeromedical Research Lab. (United States)
Phillip A. Johnson, U.S. Army Aeromedical Research Lab. (United States)
Melissa H. Ledford, U.S. Army Aeromedical Research Lab. (United States)
Clarence E. Rash, U.S. Army Aeromedical Research Lab. (United States)


Published in SPIE Proceedings Vol. 3689:
Helmet- and Head-Mounted Displays IV
Ronald J. Lewandowski; Loran A. Haworth; Henry J. Girolamo, Editor(s)

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