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21 March 1989 Vision Restriction Device (VRD)
Gerald C. Holst
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Proceedings Volume 1117, Display System Optics II; (1989) https://doi.org/10.1117/12.960936
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States
Abstract
In geographical areas where low-level nighttime training with high-speed aircraft is restricted, it becomes imperative to employ a vision restriction device (VRD) that simulates nighttime conditions during daytime training. In response to this requirement, a new "bifocal" visor has been designed and evaluated. It consists of spectrally selective filters centered on the eyes, a neutral density lower portion, and is opaque elsewhere. The filters increase the contrast of the navigation forward-looking infrared (FLIR) image projected onto the heads up display (HUD). The neutral density portion allows the pilot to see all displays in full color by simply glancing down. The remainder of the visor is opaque so that the pilot cannot see the outside world and, as such, the visor simulates nighttime conditions. Initial pilot response has been favorable and flight tests are currently underway for evaluation purposes.
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Gerald C. Holst "Vision Restriction Device (VRD)", Proc. SPIE 1117, Display System Optics II, (21 March 1989); https://doi.org/10.1117/12.960936
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KEYWORDS
Heads up displays
Forward looking infrared
Optical filters
Head
Opacity
Sun
Dielectric filters
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