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    RADIATION DETECTOR
    1.
    发明公开
    RADIATION DETECTOR 有权
    辐射探测器

    公开(公告)号：EP2016671A1

    公开(公告)日：2009-01-21

    申请号：EP07732560.3

    申请日：2007-04-25

    申请人： Thruvision Limited

    发明人： MANN, Christopher, Mark ,  COOMBS, David, John

    IPC分类号： H03D9/06

    CPC分类号： H01Q21/064 ,  H01L24/45 ,  H01L2224/45015 ,  H01L2224/45144 ,  H01L2924/00014 ,  H01L2924/01014 ,  H01L2924/01078 ,  H01L2924/01079 ,  H01L2924/12032 ,  H01L2924/12042 ,  H01L2924/19041 ,  H01L2924/3011 ,  H01Q21/0087 ,  H03D9/0641 ,  Y10T29/49016 ,  H01L2224/48 ,  H01L2924/00

    摘要： In a terahertz radiation detection system, such as a terahertz camera, an array of feedhorns feeds detected radiation to diode-based mixers for mixing with a local oscillator to produce modulated intermediate frequency (“IF”) signals that can be amplified and used in imaging. The mixers are accommodated on the surface of a substrate and multiple substrates can be layered up to support a two-dimensional array of feedhorns. In order to improve packing density and thus potentially the resolution of a camera, IF filters for use in extracting the modulated IF signals are accommodated in vias through the substrates. Further, stub tuners are provided which co-operate with signal-carrying sections of microstrip to improve coupling of detected radiation and local oscillator signals to the mixers. Although the stub tuners are shared with respect to both the detected radiation and the local oscillator signals in each mixer, the involvement of the microstrips means that tuning can be optimised independently with respect to the detected radiation and to the local oscillator signals.

    DETECTION METHOD AND APPARATUS
    2.
    发明公开
    DETECTION METHOD AND APPARATUS 审中-公开
    检测方法和设备

    公开(公告)号：EP1989785A1

    公开(公告)日：2008-11-12

    申请号：EP07712734.8

    申请日：2007-02-16

    申请人： Thruvision Limited

    发明人： MANN, Christopher, Mark ,  GRAVE, Simon, Ward

    IPC分类号： H04B1/40 ,  G01N21/35

    CPC分类号： H04B1/40 ,  G01N21/3581

    摘要： In a terahertz radiation detection system, an array of harmonic transmitters/receivers can be scanned across a field of view. By using an unbalanced pair of Schottky diodes in the mixer of a heterodyne receiver, the receiver can be converted to a transmitter, generating terahertz radiation at even harmonics of the local oscillator. By using local oscillators of different frequencies in the transmitter and a receiver, the receiver can detect the generated radiation. In alternative arrangements, the local oscillator of the transmitter might have the same frequency as that of the receiver but be modulated, either directly or simply as a result of the transmitter being scanned across the field of view. If modulated directly, it might be amplitude or frequency modulation, these having different advantages. A receiver can be switched between acting as a transmitter and as a receiver by turning on and off an electrical bias to the Schottky diode pair. Embodiments of the invention have the further advantages of high signal to noise ratio in the output and the use of narrow bandwidth processing of the IF output.

    摘要翻译： 在太赫兹辐射探测系统中，谐波发射器/接收器阵列可以跨越视场进行扫描。 通过在外差式接收机的混频器中使用一对不平衡的肖特基二极管，可以将接收机转换为发射机，在本地振荡器的偶次谐波处产生太赫兹辐射。 通过在发射器和接收器中使用不同频率的本地振荡器，接收器可以检测到所产生的辐射。 在另一种安排中，发射机的本地振荡器可能与接收机的本地振荡器具有相同的频率，但是可以直接或者简单地作为发射机扫描整个视场的结果进行调制。 如果直接调制，它可能是幅度或频率调制，这些具有不同的优点。 通过打开和关闭肖特基二极管对的电偏置，接收器可以在作为发射器和接收器之间切换。 本发明的实施例具有输出中的高信噪比以及使用IF输出的窄带宽处理的其他优点。