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Ultrathin Fresnel Lens Could Make IR Imagers Cheaper

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An innovative ultrathin lens could lead to more affordable IR thermal imaging cameras. The 1-mm-thick silicon Fresnel lens was developed by researchers from the French aerospace lab Onera, French thermal imaging sensor company ULIS, the Optical Institute and the French National Center for Scientific Research. A picture taken with the new camera. The system can detect people and some details of a setting, in this case an office. Images courtesy of Optics Letters. Silicon is less expensive than materials traditionally used in IR cameras such as germanium and chalcogenide, and...Read full article

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