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    • 2. 发明授权
    • Noise reduced photon detector
    • 降噪光子探测器
    • US06359283B1
    • 2002-03-19
    • US09451111
    • 1999-11-30
    • Neil T. GordonAnthony M. WhiteCharles T. Elliott
    • Neil T. GordonAnthony M. WhiteCharles T. Elliott
    • G01T124
    • H01L27/14649H01L27/1462H01L27/14625
    • A noise reduced photon detector incorporates an array (10) of semiconductor diode detector elements (12). Each element (12) has an extrinsic active layer (20) sandwiched between two layers (18, 22) of wider bandgap and mutually opposite conductivity type. These layers are in turn sandwiched between two further layers (16, 24) of wider bandgap than the active layer (20) and of higher doping than the other layers (18, 22). A mirror (34) extends round much the array (10) and isolates each element (12) from photons emitted by other elements (12). In operation the elements (12) are reverse biased and exhibit negative luminescence which reduces their photon emission. These two effects reduce unwanted photon generation and absorption, and consequently photon noise is also reduced.
    • 噪声降低的光子检测器包括半导体二极管检测器元件(12)的阵列(10)。 每个元件(12)具有夹在更宽带隙和相互相反导电类型的两层(18,22)之间的外在有源层(20)。 这些层又被夹在比有源层(20)更宽的带隙的两个另外的层(16,24)之间,并且比其它层(18,22)具有更高的掺杂。 反射镜(34)围绕阵列(10)延伸并且将每个元件(12)与由其它元件(12)发射的光子隔离。 在操作中,元件(12)被反向偏置并且表现出负的发光,这降低了它们的光子发射。 这两种效应减少了不必要的光子产生和吸收,因此光子噪声也降低了。
    • 3. 发明授权
    • Thermal imaging system
    • 热成像系统
    • US06175113B1
    • 2001-01-16
    • US09043496
    • 1998-03-27
    • Timothy AshleyCharles T. ElliottNeil T. GordonRalph S. Hall
    • Timothy AshleyCharles T. ElliottNeil T. GordonRalph S. Hall
    • G01J530
    • H04N5/33G01J5/522H04N5/3651
    • A thermal imaging system (10) which is accoupled and by scanning recreates a thermal image by superimposing measured variations in infrared emission from a scene (22) onto a reference level supplied by a light emitting diode (28). The diode (28) is both a positive and negative luminescent emitter. Emitted flux is current controlled to be equivalent to black body radiation at a range of temperatures which may be colder or hotter than ambient. A signal generated with the system (10) switches between scene and diode observation is a measure of the difference between the mean scene temperature and the diode effective temperature. In response to this digital, control means adjust the bias current through the diode (28) in order to reduce the temperature difference. The reference temperature converges towards the mean scene temperature as this process is repeated. Absolute temperature is thus restored and some image defects removed.
    • 通过将来自场景(22)的红外发射中的测量变化叠加到由发光二极管(28)提供的参考电平上而被耦合并通过扫描重新产生热图像的热成像系统(10)。 二极管(28)既是正的和负的发光发射器。 电流通量控制在相当于在比环境温度更冷或更热的温度范围内的黑体辐射。 通过系统(10)产生的信号在场景和二极管观测之间切换是平均场景温度和二极管有效温度之间差异的度量。 响应于该数字,控制装置调节通过二极管(28)的偏置电流,以便降低温度差。 当该过程重复时,参考温度趋向于平均场景温度。 因此恢复绝对温度并消除一些图像缺陷。