Reflection-Type CW-Millimeter-Wave Imaging with a High-Sensitivity Waveguide-Mounted Electro-Optic Sensor

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Abstract
We present a novel reflection-type imaging system that uses 100-GHz cw millimeter waves (MMWs). In the system, MMWs reflected by objects are separated from an incident MMW path by a circulator. The separated MMWs are detected by a high-sensitivity electro-optic (EO) sensor mounted in a rectangular waveguide. With the EO sensor, minimum detectable MMW power is less than -60 dBm. Using cw-MMWs, we can obtain both amplitude and phase images of objects directly. The system also features high-speed mechanical stages, which reduce image acquisition time. The acquisition time for 20,000-pixel amplitude and phase images is less than 10 min. We demonstrate that reflection-type imaging is effective in providing important information that cannot be obtained by conventional transmission-type imaging.

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