厚度仅百分之一毫米的相机问世
<p><span word="Cameras">Cameras</span> <span word="were">were</span> <span word="once">once</span> <span word="big">big</span> <span word="and">and</span> <span word="bulky">bulky</span>. <span word="Today">Today</span>, <span word="really">really</span> <span word="good">good</span> <span word="cameras">cameras</span> <span word="fit">fit</span> <span word="in">in</span> <span word="your">your</span> <span word="pocket">pocket</span>. <span word="And">And</span> <span word="now">now</span>, <span word="researchers">researchers</span> <span word="at">at</span> <span word="Cornell">Cornell</span> <span word="have">have</span> <span word="developed">developed</span> <span word="a">a</span> <span word="camera">camera</span> <span word="that">that</span>’<span word="s">s</span> <span word="just">just</span> <span word="a">a</span> <span word="half">half</span>-<span word="millimeter">millimeter</span> <span word="on">on</span> <span word="each">each</span> <span word="side">side</span> <span word="and">and</span> <span word="a">a</span> <span word="hundredth">hundredth</span> <span word="of">of</span> <span word="a">a</span> <span word="millimeter">millimeter</span> <span word="thick">thick</span>。</p><p>以前的照相机都又大又笨，而如今，一些好的照相机小到可以装进口袋里。最近，康奈尔大学的研究人员已经发明一种长宽只有半毫米，厚度仅百分之一毫米的照相机。</p><p><span word="The">The</span> <span word="lens">lens</span>-<span word="less">less</span> <span word="device">device</span> <span word="is">is</span> <span word="called">called</span> <span word="a">a</span> <span word="Planar">Planar</span> <span word="Fourier">Fourier</span> <span word="Capture">Capture</span> <span word="Array">Array</span>. <span word="It">It</span>’<span word="s">s</span> <span word="a">a</span> <span word="flat">flat</span> <span word="piece">piece</span> <span word="of">of</span> <span word="doped">doped</span> <span word="silicon">silicon</span>. <span word="Each">Each</span> <span word="of">of</span> <span word="its">its</span> <span word="pixels">pixels</span> <span word="is">is</span> <span word="sensitive">sensitive</span> <span word="to">to</span> <span word="specific">specific</span> <span word="incident">incident</span> <span word="angles">angles</span> <span word="and">and</span> <span word="supplies">supplies</span> <span word="a">a</span> <span word="component">component</span> <span word="of">of</span> <span word="the">the</span> <span word="mathematical">mathematical</span> <span word="operation">operation</span> <span word="called">called</span> <span word="the">the</span> <span word="Fourier">Fourier</span> <span word="Transform">Transform</span> <span word="to">to</span> <span word="produce">produce</span> <span word="an">an</span> <span word="image">image</span> <span word="about">about</span> 20 <span word="pixels">pixels</span> <span word="across">across</span>. <span word="The">The</span> <span word="details">details</span> <span word="of">of</span> <span word="the">the</span> <span word="new">new</span> <span word="camera">camera</span> <span word="are">are</span> <span word="outlined">outlined</span> <span word="in">in</span> <span word="the">the</span> <span word="journal">journal</span> <span word="Optics">Optics</span> <span word="Letters">Letters</span>。</p><p>这种无镜头照相机被称为平面傅里叶捕获阵列。它其实就是一块参杂了硅元素的扁平材料。它的每一个像素点都对指定的入射角十分敏感，并提供一部分称为“傅里叶变换”的数学运算以产生一张20像素的图像。这款新型相机的细节发布在《光学快报》期刊上。</p><p><span word="Animals">Animals</span> <span word="like">like</span> <span word="the">the</span> <span word="nautilus">nautilus</span> <span word="manage">manage</span> <span word="with">with</span> <span word="lens">lens</span>-<span word="less">less</span> <span word="eyes">eyes</span>. <span word="The">The</span> <span word="images">images</span> <span word="aren">aren</span>’<span word="t">t</span> <span word="necessarily">necessarily</span> <span word="sharp">sharp</span>, <span word="but">but</span> <span word="they">they</span>’<span word="re">re</span> <span word="still">still</span> <span word="useful">useful</span>. <span word="Same">Same</span> <span word="with">with</span> <span word="this">this</span> <span word="tiny">tiny</span> <span word="camera">camera</span>。</p><p><span word="Patrick">Patrick</span> <span word="Gill">Gill</span>, <span word="who">who</span> <span word="headed">headed</span> <span word="the">the</span> <span word="project">project</span>, <span word="had">had</span> <span word="been">been</span> <span word="trying">trying</span> <span word="to">to</span> <span word="create">create</span> <span word="a">a</span> <span word="lens">lens</span>-<span word="less">less</span> <span word="implantable">implantable</span> <span word="device">device</span> <span word="to">to</span> <span word="detect">detect</span> <span word="brain">brain</span> <span word="neurons">neurons</span> <span word="that">that</span>, <span word="due">due</span> <span word="to">to</span> <span word="modifications">modifications</span>, <span word="glow">glow</span> <span word="when">when</span> <span word="they">they</span>’<span word="re">re</span> <span word="active">active</span>。</p>
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