EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of MIL-DTL-43511D testing. This specification covers general and performance requirements for curved polycarbonate flyer helmet visors worn by flight crew personnel.
The visor is protective equipment for the pilot. This mechanical requirement determines the choice of optical resin. Polycarbonate is the preferred material because of its superior impact resistance. The impact strength of polycarbonate compensates for the reduced transmission and birefringence properties relative to other optical resins (i.e. acrylic, polystyrene and cyclic olefin polymers). Polycarbonate is also the material of choice for less advanced protective optical visors such as ice hockey and motorcycles.
Thin-film optical coatings provide an AR (anti-reflection) coating on the outer surface and a beam splitter coating on the inner, concave imaging surface. The image source density and beam splitter coating reflectivity determine the brightness for the pilot.
The ghost image is the result of reflections from both the inner and outer surfaces of the viewfinder. The screen is displayed on the inside surface of the viewfinder. However, some light passes through the viewfinder and is reflected from the outer surface and returns to the pilot. This reflection on the outer surface causes ghosting or secondary reflection.
EUROLAB assists manufacturers with MIL-DTL-43511D test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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