CW THz standoff imaging

Chao Deng; Yalin Zhang; Junkai Mu; Yuejin Zhao; Cunlin Zhang

doi:10.1117/12.838033

18 November 2009 CW THz standoff imaging

Chao Deng, Yalin Zhang, Junkai Mu, Yuejin Zhao, Cunlin Zhang

Proceedings Volume 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security; 75120L (2009) https://doi.org/10.1117/12.838033
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

We present a continuous-wave (CW) terahertz (THz) standoff scanning imaging system at 0.2 THz. This system works at reflection geometry and the imaging distance is 30 m. A Gunn oscillator is utilized as emitter and an unbiased Schottky diode operated at room temperature is employed as detector. A polyethylene Fresnel lens is used to collimation terahertz wave for standoff propagation. five aluminum mirrors are employed to increase distance. The sample is placed on an X-Y two-dimensional stage which is controlled by a computer. The collimated THz wave propagates in air and is focused to the sample by another polyethylene Fresnel lens. The back scatted THz wave from the sample surface is collected by the detector alone the same path. The two-dimensional image of sample is obtained by a raster scanning fashion. An aluminum plate with holes, an airplane model and a toy gun contained in a box are imaged at 30 m from the imaging unit. The results show that this standoff imaging system has a wide potential to be applied in the area of security inspection and screening.

Citation Download Citation

Chao Deng, Yalin Zhang, Junkai Mu, Yuejin Zhao, and Cunlin Zhang "CW THz standoff imaging", Proc. SPIE 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security, 75120L (18 November 2009); https://doi.org/10.1117/12.838033

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available