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평행판 도파관 THz 분광을 이용한 폭발물 RDX 검출
유병화(Byung Hwa Yoo),정동철(Dong Chul Chung),강승범(Seung Beom Kang),곽민환(Min Hwan Kwak),강광용(Gwang-Yong Kang) 대한전기학회 2012 전기학회논문지 Vol.61 No.12
In this paper we presented the detection of the explosive material RDX using a parallel plate waveguide (PPWG) THz time domain spectroscopy (TDS). Normally the explosive materials have been characterized through identification of vibrational fingerprint spectra. Until now, most of all THz spectroscopic measurements have been made using pellet samples where disorder effects contribute to line broadening such that individual resonances merge into relatively broad absorption features. In order to avoid such disadvantages we used the technique of PPWG THz-TDS to achieve sensitive characterization of explosive material RDX. The PPWG THz-TDS used in this work well established ultrafast optoelectronic techniques to generate and detect sub-picosecond THz pulses. The explosive material was analyzed as powder layers in 112 ㎛gap of metal PPWG. The thin later mass was estimated to be about 700 ㎍ Finally, we showed spectra of explosives from 0.2 to 2.4 THz measured using PPWG THz-TDS.
고온초전도체를 이용한 마이크로파 전력분배기의 소형화 개발
정동철(Dong-Chul Chung),유병화(Byung-Hwa Yoo),곽민환(Min-Hwan Kwak),강광용(Gwang-Yong Kang),한병성(Byoung-Sung Han) 대한전기학회 2009 전기학회논문지 P Vol.58 No.3
In this paper, We report the miniaturization of superconducting microwave power dividers based on lumped element equivalent circuits. To do this, we analyzed a conventional branch-type power divider by using an ABCD matrix under even and odd mode excitation. Then, we calculated each lumped element impedance throughout this analysis of a transmission line matrix. Also we simulated our equivalent circuits made of lumped elements by using a full wave analysis, em Sonnet. Our deign of microwave power divider based on simulated results was fabricated on high-Tc superconducting thin films deposited on MgO substrate. Experimental results were reported in terms of bandwidth, center frequency, and phase difference between S21 and S31. We confirm that our design will be useful in the future microwave power systum.