The investigation of single-pixel terahertz (THz) imaging opens up a new research direction for the development of THz imaging technology. In this work, we exploit a reflective single-pixel THz imaging system based on photoinduced dynamic masks. By combining the compressed sensing and inverse Fresnel diffraction algorithms, a reflective THz spectral image is accurately reconstructed and the morphology of a sample is clearly observed. Three application potentials of the THz imaging system are fully proved, including time-of-flight measurement of a sample with multiple interfaces, noninvasive testing of a hidden object, and spectral identification of different chemical substances. The reflection-type measurement mode effectively improves the practicability of single-pixel THz imaging.

中文翻译：

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基于压缩感知的反射式单像素太赫兹成像

单像素太赫兹（THz）成像的研究为太赫兹成像技术的发展开辟了新的研究方向。在这项工作中，我们开发了一种基于光致动态掩模的反射式单像素太赫兹成像系统。通过结合压缩传感和逆菲涅耳衍射算法，可以准确重建反射太赫兹光谱图像，并清楚地观察样品的形态。充分证明了太赫兹成像系统的三个应用潜力，包括多界面样品的飞行时间测量、隐藏物体的无创检测和不同化学物质的光谱识别。反射式测量模式有效提高了单像素太赫兹成像的实用性。