CAJ | 학술논문

太赫兹时域光谱(THz-TDS)图像是一种新的图像形式,THz-TDS图像的每个像素点是一个一雏时间脉冲信号,该信号承栽了像素点位置处目标材料在太赫兹(THz)波段的吸收谱或散射谱.由于THz频段覆盖了许多有机大分子和半导体材料分子振动和转动的频率,可以预计,随着THz技术发展的不断深入,THz-TDS技术乃至THz-TDS图像分析技术将会成为研究这些材料基础问题的重要手段.本文针对THz-TDS图像的特点.提出了一种对在THz-TDS图像序列中的目标微小运动进行检测和估计的方法.该方法通过假设目标材料的局部THz特性保持守恒,导出了目标物的运动方程,并通过引入矢量同质微分概念,给出了该方程的近似求解方法.本文最后给出的实验结果验证了方法的可行性和有效性.
태혁자시역광보(THz-TDS)도상시일충신적도상형식,THz-TDS도상적매개상소점시일개일추시간맥충신호,해신호승재료상소점위치처목표재료재태혁자(THz)파단적흡수보혹산사보.유우THz빈단복개료허다유궤대분자화반도체재료분자진동화전동적빈솔,가이예계,수착THz기술발전적불단심입,THz-TDS기술내지THz-TDS도상분석기술장회성위연구저사재료기출문제적중요수단.본문침대THz-TDS도상적특점.제출료일충대재THz-TDS도상서렬중적목표미소운동진행검측화고계적방법.해방법통과가설목표재료적국부THz특성보지수항,도출료목표물적운동방정,병통과인입시량동질미분개념,급출료해방정적근사구해방법.본문최후급출적실험결과험증료방법적가행성화유효성.
The terahertz time-domain spectroscopy (THz-TDS) image is a new kind of image form. in which ,each pixcl is actually a temporal response pulse signal of THz reference pulse. A THz-TDS image not only provides the geometric information of a specimen, but also provides its absorption spectral or scatter spectral information contained in the THz waveforms. As oscillation and rotation characteristic frequencies of many organic macromolecules and semiconductor material molecules occupying at the range of THz band, it can be expected that, with the de-velopment of THz technology ,THz-TDS image analysis technique will become an important approach to study those materials' characteristics. In this paper,a method to detect small shift motion in the THz-TDS image sequences is proposed. In the proposed method ,by assuming that the THz response characteristic of one object material would be retained in a spatial local region ,a vector partial differential equation depic-ting movement is established, and a kind of vector homogeneous differential operator is introduced to approximate the solution. Finally, two ex-periments are given ,and results show that the proposed method is feasible and effective.