利用太赫兹时域光谱技术检测水和氯化钠溶液  

Detection of Na Cl solutions using terahertz time-domain spectroscopy

作　　者：王萃萃 刘尚建[4] 赵晓晶 左剑[1,2,3] 张存林[1,2,3] WANG Cuicui;LIU Shangjian;ZHAO Xiaojing;ZUO Jian;ZHANG Cunlin(Department of Physics Capital Normal University, Beijing 100048, China;Dongzhimen Hospital,Beijing University of Chinese Medicine,Beijing 100700,China;Ministry of Education Key Laboratory of Terahertz Optoelectronics Capital Normal University, Beijing 100048, China;Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Capital Normal University, Beijing 100048, China)

机构地区：[1]首都师范大学物理系,北京100048 [2]首都师范大学太赫兹光电子学教育部重点实验室,北京100048 [3]首都师范大学北京市太赫兹波谱与成像重点实验室,北京100048 [4]北京中医药大学东直门医院,北京100700

出　　处：《太赫兹科学与电子信息学报》2017年第4期548-552,共5页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家科技部"国家重大科学仪器设备开发专项"基金资助项目(2012YQ1400050901);国家自然科学基金资助项目(11204190);北京市教育委员会科技计划面上资助项目(KM201610028005);首都师范大学交叉科研项目(008175304400)

摘　　要：太赫兹电磁波谱与液体分子的转动和振动能量对应,适合研究液体分子的动力学信息。水和氯化钠广泛存在于生物组织中,也是生命的重要组成部分。太赫兹时域光谱技术被广泛应用于液体检测,通过分析溶液中物质内部结构以及分子微观运动状态,在0.2~1.5 THz频率下,可以得到物质的吸收系数、折射率以及介电函数等。利用德拜模型模拟实验结果得到水溶液、氯化钠溶液的介电函数以及弛豫时间,可得到水和氯化钠溶液分子快速移动的特征时间分别为9.6 ps和10.7 ps,并获得了与分子结构相关的动力学信息。Terahertz spectrum is corresponding with vibration and rotation of liquid molecules.It is suitable to identify and research the liquid molecular dynamics.As a powerful spectral detection technology,Terahertz Time-Domain Spectroscopy(THz-TDS)is widely applied in solution detection.The absorption coefficient,refractive index and dielectric function of solutions can be extracted based on terahertz time-domain spectroscopy.Water and NaCl exist in most biological tissues,which are very important for life.In this paper,water and NaCl solutions are detected under room temperature by THz-TDS technique in the range of0.2-1.5THz.The terahertz dielectric function of the water and NaCl(sodium chloride)solutions is fitted by Debye model,from which the dielectric relaxation time can be obtained.By means of dielectric relaxation process,it is found that the characteristic time of molecular movement and the information related to the liquid molecular structure and movement are obtained.The terahertz dielectric function of the water and NaCl solutions is fitted by Debye model,where the dielectric relaxation time of water and NaCl solutions is9.6ps and10.7ps respectively.By means of dielectric relaxation process,it is found that the characteristic time of molecular movement and the information related to the liquid molecular structure and movement are obtained.

关 键 词：太赫兹时域光谱 水 氯化钠溶液 介电函数 德拜模型 

分 类 号：O441.4[理学—电磁学]