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A summary of the terahertz imaging radar of the heterodyne and homodyne scheme is presented, with an emphasis on the differences between the two schemes. The transmitters employ Direct Digital Waveform Synthesis (DDWS) in the baseband so that the reliable fast scanning frequency synthesizers are obtained to meet the fast imaging requirement. The scanning speed is 40us with an instantaneous bandwidth...
Terahertz imaging scheme with simplified single homodyne channel was proposed. To realize the calibration and coherent imaging, a Hilbert transform receiver was employed to recover the quadrature signal and obtain the phase information of the return wave. Proof-of-State experiment at 0.22THz band was performed to verify the effectiveness of the proposed imaging scheme, which may find potential applications...
We present a study of in-camera image processing through an extensive analysis of more than 10,000 images from over 30 cameras. The goal of this work is to investigate if image values can be transformed to physically meaningful values, and if so, when and how this can be done. From our analysis, we found a major limitation of the imaging model employed in conventional radiometric calibration methods...
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