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Mirrors Replace Lenses in UAVs

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DRESDEN, Germany, Jan. 19, 2010 – Unmanned aerial vehicles (UAVs) carry optical measuring equipment that is required to operate free of chromatic aberrations across a wide spectral range – from ultraviolet to infrared. Conventional lens systems comprised of several lens elements are of limited use because when required to image a wide spectral range the image quality suffers from color fringing and becomes blurred. Traditionally, specific lenses have been used for each different spectral band, but because UAVs can only carry a limited amount of weight this approach proves difficult. A novel lens system...Read full article

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    Published: January 2010
    Glossary
    image quality
    A measure of the closeness with which an optical image is capable of resembling the original object. The factors that affect image quality are lens aberrations, diffraction, dirt and stray light within the system, and atmospheric turbulence and haze outside it. If the image is recorded photographically, it can become further degraded by image motion during exposure and by light diffusion in the emulsion. At one time image quality was expressed by its resolving power, but today a more meaningful...
    infrared
    Infrared (IR) refers to the region of the electromagnetic spectrum with wavelengths longer than those of visible light, but shorter than those of microwaves. The infrared spectrum spans wavelengths roughly between 700 nanometers (nm) and 1 millimeter (mm). It is divided into three main subcategories: Near-infrared (NIR): Wavelengths from approximately 700 nm to 1.4 micrometers (µm). Near-infrared light is often used in telecommunications, as well as in various imaging and sensing...
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
    ultraviolet
    That invisible region of the spectrum just beyond the violet end of the visible region. Wavelengths range from 1 to 400 nm.
    unmanned aerial vehicle
    An unmanned aerial vehicle (UAV), commonly known as a drone, is an aircraft without a human pilot onboard. UAVs are remotely controlled or autonomously operated, and they can be used for various purposes across different industries. These vehicles range in size from small hobbyist models to large military or commercial drones. Key characteristics of unmanned aerial vehicles include: Remotely piloted or autonomous: UAVs can be operated by a human pilot using a remote control system or, in...
    all-reflective zoom objectivechromatic aberrationsdeformable mirrorsDr. Heinrich GrügerEuropef-numberFraunhoferGermanyimage qualityImaginginfraredIPMSlensesmirrorsNews & Featuresoptical simulationsOpticsphotonicsResearch & Technologyspectral bandSpectral RangeUAVultravioletunmanned aerial vehicle

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