| 摘要 |
An instrument flight training hood including a voltage-controlled, liquid crystal viewing lens operable to a first state of transparency when a wearer is viewing the instrument control panel of his aircraft and operable to a second state of opacity to instantaneously occlude viewing when wearer changes his line of vision outside of the aircraft. A uniform passageway recessed within the hood directionally communicates light received from an area of space substantially along the wearer's line of sight, to a photocell for lens state actuation responsive to a manually preset light intensity threshold. A manual switching arrangement permits maintenance of lens transparency to provide vertigo simulation capabilities upon flight landing approach whereby wearer changing his line of sight outside of the aircraft to occlude his viewing, and thereafter manually switching the lens to its transparent state enters a condition of vertigo. |
