Rear Admiral David J. HahnChief of Naval Research. Director, Innovation Technology Requirements, and Test and Evaluation. Raised in Tampa, Florida, Rear Admiral David Hahn graduated from the U.S. Naval Academy with distinction in 1985, earning a Bachelor of Science degree in Mechanical Engineering.
Plastic optical fiber (POF) (or Polymer optical fibre) is an optical fiber that is made out of polymer.Similar to glass optical fiber, POF transmits light (for illumination or data) through the core of the fiber.Its chief advantage over the glass product, other aspect being equal, is its robustness under bending and stretching.ne of the most exciting developments in polymer fibers has been the development of microstructured polymer optical fibers (mPOF), a type of photonic crystal fiber. POF fiber also has applications in sensing. It is possible to write fiber Bragg gratings in single and multimode POF.
Polyvinyl fluoride (PVF) or â(CH 2 CHF) n â is a polymer material mainly used in the flammability-lowering coatings of airplane interiors and photovoltaic module backsheets.It is also used in raincoats and metal sheeting.Polyvinyl fluoride is a thermoplastic fluoropolymer with the repeating vinyl fluoride unit: It is structurally very similar to polyvinyl chloride. PVF has low permeability for vapors, burns very slowly, and has excellent resistance to weathering and staining.It is also resistant to most chemicals, except ketones and esters. It is available as a film in a variety of colors, and formulations for various end uses, and as a resin for specialty coatings.t is also used in raincoats and metal sheeting. Polyvinyl fluoride is a thermoplastic fluoropolymer with the repeating vinyl fluoride unit: It is structurally very similar to polyvinyl chloride. PVF has low permeability for vapors, burns very slowly, and has excellent resistance to weathering and staining.