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    • 4. 发明申请
    • MILLIMETER WAVE IMAGING SYSTEM
    • US20080191925A1
    • 2008-08-14
    • US11300827
    • 2005-12-14
    • Chris MartinJohn Lovberg
    • Chris MartinJohn Lovberg
    • G01S13/04G01S13/89
    • G01V8/005H01Q3/22H01Q3/2682H01Q25/005
    • A millimeter wave imaging system. The system includes at least one millimeter wave frequency scanning antenna for collecting frequency dependent beams of millimeter wave radiation from a narrow one-dimensional field of view; a millimeter wave amplifier for amplifying at the collected frequencies said millimeter wave radiation. A beam-former separates the amplified radiation to produce frequency dependent signals corresponding to the frequency dependent beam. The beam-former includes delay lines, a millimeter wave lens, and an array of millimeter wave power detectors for detecting the power in each frequency dependent beam. A sampling circuit reads out the frequency dependent signals to produce a one-dimensional image of the antenna field of view. A two dimensional image of a target may be obtained by moving the target across the field of view of the scanning antenna or by moving the antenna in order to scan its line of focus over the target. In preferred embodiments a 2×2 Dicke switch is provided to permit sampling a reference thermal source for gain control while continuing to collect image information. This 2×2 Dicke switch provides a square root of 2 improvement in temperature sensitivity over a single receiver version. Preferred embodiments also include features for focusing the antenna within a range of about 5 feet to infinity.
    • 毫米波成像系统。 该系统包括至少一个毫米波频率扫描天线,用于从窄的一维视场收集毫米波辐射的频率相关波束; 毫米波放大器,用于在收集的频率上放大所述毫米波辐射。 波束形成器分离放大的辐射以产生对应于频率相关波束的频率相关信号。 波束成形器包括延迟线,毫米波透镜和用于检测每个频率相关光束中的功率的毫米波功率检测器阵列。 采样电路读取频率相关信号以产生天线视场的一维图像。 可以通过在扫描天线的视野上移动目标或通过移动天线以便在目标上扫描其焦点线来获得目标的二维图像。 在优选实施例中,提供2x2Dicke开关以允许对参考热源进行采样以获得增益控制,同时继续收集图像信息。 这个2x2 Dicke开关在单个接收器版本上提供了2个温度灵敏度提高的平方根。 优选实施例还包括用于将天线聚焦在约5英尺至无限远的范围内的特征。