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Mid-IR Lens Incorporates Waste Sulfur

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Thin, inexpensive plastic lenses for IR imaging devices can be manufactured from waste sulfur generated by refining fossil fuels. The plastic is transparent to wavelengths from 3 to 5 µm, has a refractive index between 1.865 and 1.745, and has high optical focusing power, according to researchers from the University of Arizona. Most polymers have refractive indices below 1.6 and transmit much less midrange IR, the researchers said. Inexpensive sulfur lenses can be manufactured using waste sulfur and an additive in liquid form, baked in a conventional oven using a silicone...Read full article

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    Photonics Spectra
    Jul 2014
    GLOSSARY
    thermal imaging
    The process of producing a visible two-dimensional image of a scene that is dependent on differences in thermal or infrared radiation from the scene reaching the aperture of the imaging device.
    American Chemical SocietyAmericasAsia-Pacificcameraschemicalsdefensefossil fuelsimaginginfrared camerasKorealensesmaterialsmid-IRNational Science Foundationnight visionopticsResearch & TechnologyRobert A. NorwoodsulfurTech Pulsethermal imagingUniversity of ArizonaJeffrey Pyun

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