Non-destructive sub-THz CW imaging

Nicholas Karpowicz; Hua Zhong; Jingzhou Xu; Kuang-I Lin; Jenn-Shyong Hwang; Xi-Cheng Zhang

doi:10.1117/12.590539

25 March 2005 Non-destructive sub-THz CW imaging

Nicholas Karpowicz, Hua Zhong, Jingzhou Xu, Kuang-I Lin, Jenn-Shyong Hwang, Xi-Cheng Zhang

Proceedings Volume 5727, Terahertz and Gigahertz Electronics and Photonics IV; (2005) https://doi.org/10.1117/12.590539
Event: Integrated Optoelectronic Devices 2005, 2005, San Jose, California, United States

Abstract

A simple, compact CW sub-THz imaging system, utilizing a 0.2 and 0.6 THz Gunn diode source is presented. A silicon beam lead diode detector and a Golay cell are used for the detection. Various results are presented, which show that the CW THz imaging modality is suitable for diverse applications, such as non-destructive testing and security. The key components of the system include the Gunn diode assembly, an optical chopper, a polyethylene lens, a detector, a lock-in amplifier, and two translation stages. The beam from the Gunn diode is focused on the sample being imaged by the polyethylene lens, the transmitted or reflected beam is measured by the detector. The energy transmitted through the sample at each point in the plane of the sample is detected. Since the system has relatively few components compared to pulsed THz imaging systems, it is less expensive and easier to design and operate, although it does not provide depth or spectral information about the sample. Since no time-delay scans take place, scanning can be done quickly compared to a time-domain system, limited by the maximum velocity of the translation stages and response of the detectors. It provides information about the macroscopic features of hidden structures within materials that are transparent to sub THz radiation, such as space shuttle insulating foam, articles of clothing, and luggage.

Citation Download Citation

Nicholas Karpowicz, Hua Zhong, Jingzhou Xu, Kuang-I Lin, Jenn-Shyong Hwang, and Xi-Cheng Zhang "Non-destructive sub-THz CW imaging", Proc. SPIE 5727, Terahertz and Gigahertz Electronics and Photonics IV, (25 March 2005); https://doi.org/10.1117/12.590539

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