New White Paper Demonstrates How Abrasion Resistant Lenses Lower Maintenance Costs in Exterior Aircraft Lighting Systems
To inform and aid lighting engineers, operators, aircraft manufacturers, and regulators in their evaluation process, Kopp has published a new white paper that investigates the abrasion resistance of transparent materials used in exterior jet aircraft lighting applications. In the first part, the Taber Abrasion test method was used to evaluate how these materials withstand abrasion introduced through routine handling and cleaning of lenses. In the second part, third-party high-velocity particulate impact test was completed at the US Air Force Particle Erosion Test Facility at the University of Dayton Research Institute (UDRI). The particle erosion test apparatus, or “dust-rig,” that was used was designed to simulate erosion effects on aircraft surfaces subjected in flight to dust-laden environments. The results demonstrated severe light loss, and rapid degradation was possible with the hard-coated polycarbonate as compared to heat-strengthened borosilicate glass. According to Adam Willsey, Manager of Research and Engineering at Kopp Glass:
“When our customer's design external aircraft lighting fixtures, they consider the optical, chemical, thermal, and mechanical performance of the cover lens material. Our results indicate that glass lenses exposed to abrasive particulate in the atmosphere will maintain optical output at least two times longer than a plastic lens exposed to the same conditions.”
As airframes are pressed into nearly continuous service across varying environments, using materials that can withstand particulate abrasion, thermal, and chemical stresses will reduce the total cost of ownership of an exterior light fixture. The results from this two-part study conclude that borosilicate glass lenses can withstand the harsh operating environment of aerospace for more significant periods of time than their plastic counterparts, helping to increase the longevity and reliability of LED exterior lighting systems. Abrasion resistant lenses mean reduced maintenance and operating costs over the life of the aircraft.
To download a copy of the white paper, visit: http://bit.ly/2DXUmbj
The last century has experienced remarkable advances in light-based technologies, from incandescent bulbs to efficient energy sources like LEDs, plasma, and laser diodes. The introduction of new technologies brings both exciting opportunities and complex challenges. For over 90 years Kopp Glass has helped lighting engineers effectively navigate emerging technologies and develop innovative products that enable a safer and more productive world.
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