| 摘要 |
Instrument flight training glasses including a voltage controlled, liquid crystal lens system having upper and lower contiguous lens systems independently operable with respect to each other, for limiting a pilot's vision to the instrument control panel of his aircraft when so desired. The lens systems are opacity variable for simulating flight through particular weather and cloud conditions while providing instant clearing of the lower lens system as the pilot views the aircraft control panel. During a landing approach an interlock system is manually actuable to prevent opaque obscuring of the lens system. |
