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Proceedings Paper

A continuous-wave THz imaging system
Author(s): Ting-Hang Pei; Yang-Tung Huang; Yu-Jiu Wang; Wei-Zen Chen; Chien-Nan Kuo; Yu-Ting Cheng
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Paper Abstract

We develop a continuous wave terehertz (THz) imaging system operating at 288 GHz. This imaging system simply consitutes three parts including the source, two optical lenses, and the detector. The entire size is smaller than the tranditional pulsed THz imaging system. In this developed system, the THz wave is generated by a horn attenna which concentrates the wave in an azimuth angle of 3° ~ 5°. The source originates from a singnal generator, and then the frequency increases to 288 GHz after passing through an 8X multiplier. Next, THz wave is focused by a THz lens on the test sample. By controling the sample position in the x-z plane, we can scan it pixel-by-pixel in which each step along the x- or z- axes is 0.1 mm. After penetrating the test sample, another lens collects the transmitted THz wave and focuses them into the thermal detector. This detector can disply the collected THz power. Finally, by drawing the detected power of each pixel, a transmitted-intensity figure for all pixels is obtained. The resolution of this THz imaging system is about 1~2 mm at present. We have measured human molar tooth and obtained its transmitted figures. Besides, we also develop a technology to adjust the positions of the source and detector by a system containing one laser, one beamsplitter, and two mirrors. The relative positions between the source and detector is very important. The input of the source and the output of the detector are small so that they have to aim at each other very accurately in order to collect maximum transmitted power in the detector.

Paper Details

Date Published: 23 August 2013
PDF: 6 pages
Proc. SPIE 8909, International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications, 89091G (23 August 2013); doi: 10.1117/12.2035020
Show Author Affiliations
Ting-Hang Pei, National Chiao Tung Univ. (Taiwan)
Yang-Tung Huang, National Chiao Tung Univ. (Taiwan)
Yu-Jiu Wang, National Chiao Tung Univ. (Taiwan)
Wei-Zen Chen, National Chiao Tung Univ. (Taiwan)
Chien-Nan Kuo, National Chiao Tung Univ. (Taiwan)
Yu-Ting Cheng, National Chiao Tung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 8909:
International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications
Marco Rahm; Konstantin Vodopyanov; Wei Shi; Cunlin Zhang, Editor(s)

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