Abstract
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 (THz-TDS). A practical focus-plane imaging system is built up based on the THz-TDS with the probe-beam-expanded electro-optical sampling and an infrared CCD imaging. The active terahertz continuous wave imaging is based on a CO<sub>2</sub>-laser-pumped terahertz coherent source and an uncooled bolometer array of terahertz camera. The active terahertz polarization imaging and wave front imaging is developed. For the passive terahertz imaging, the low frequency of radiometers are used to detect the point-to-point beam-scanned terahertz signal by the optical focusing and scanning system so that the passive THz imaging is realized for the security inspection of human body. The related components and image processing methods are studied and used for the improvement of imaging speed and resolution. The research on THz imaging technology at Capital Normal University is opening up a potential application in the field of non-destructive testing and security inspection for the terahertz technology.
Highlights
Terahertz (THz) imaging is a new hot topic in the current field of imaging technology [1,2,3,4,5]
The active THz pulse imaging is developed based on the THz time-domain spectroscopy [1], which is based on the amplitude distribution of THz transmission
THz polarization imaging based on continuous wave (CW) terahertz source is studied in our laboratory recently [15]
Summary
Terahertz (THz) imaging is a new hot topic in the current field of imaging technology [1,2,3,4,5]. J. van der Valk et al presented a new method to measure the polarization state of a terahertz pulse by using a modified electro-optic sampling setup [2]. THz polarization imaging based on continuous wave (CW) terahertz source is studied in our laboratory recently [15]. The performance of passive THz imaging is improved by the fast opto-mechanic scanning and higher frequency and array of THz detection. The development of these THz imaging technology is an important research direction at THz laboratory of Capital Normal University. These researches are helpful for the public security inspection and THz non-destructive testing
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