The progress on terahertz imaging at Capital Normal University in Beijing is presented. Our works on
Terahertz Imaging include the active and passive imaging. For the active terahertz imaging, the pulse
and continue wave terahertz imaging are studied, respectively. The active terahertz pulse imaging is
based on the terahertz time-domain spectroscopy with the probe-beam-expanded femtosecond pulse
laser and an infrared CCD detection. The active terahertz continuous wave imaging is based on a
CO2-laser-pumped terahertz coherent source and a NEC terahertz camera. The active terahertz
polarization imaging is studied. For the passive terahertz imaging, the low frequency radiometers are
used to detect the beam-scanned terahertz signal by the point-to-point scanning. The related
components and image processing methods are developed and used for the improvement of imaging
speed and resolution.
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