In this article, a THz imaging system with rotation mirror is built. The system considers both imaging speed and cost of hardware. The transmission-mode design realizes miniaturization of the system. With the system, we are able to acquire image size of 60 × 80 mm2 in 60 seconds, while a raster-scan THz imaging system with the same hardware conditions needs more than 30 minutes. Moreover, internal information of object could be got with the THz imaging system reported in this article.
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