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太赫兹波不依赖参考信号光谱分析

Terahertz Wave Reference-Free Spectroscopic Analysis

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摘要

理论分析了不依赖参考信号的太赫兹(THz)透射式和反射式光谱分析方法,并对弱极性材料2,4-二硝基甲苯(DNT)和黑索今(RDX)的特征光谱进行实验研究。对于透射式光谱测量,利用单脉冲THz波的相位谱呈线性分布的特点,样品信号的相位与频率的比值对频率的一阶导数包含材料的共振吸收频率特征;对于反射式光谱测量,在不考虑大气吸收的理想条件下,对样品信号的相位对频率求二阶导数可以提取弱极性材料的光谱特性。此方法不需要测量参考光,完全消除了反射谱分析中的“位移误差”,提高了反射式光谱测量的精确度。

Abstract

A reference-free spectroscopic analysis method for terahertz (THz) transmission and reflection measurement is presented. The absorption features of weakly polarized materials (RDX, 2,4-DNT and HMX) are extracted without the reference signal. For transmission spectroscopy, the absorption peaks can be located from the negative first-order derivative of the sample signal phase divided by the frequency. The absorption signatures of the reflection spectroscopy of the materials are extracted directly from the second-order derivative of the phase of the sample beam with respect to frequency. For reflection spectroscopy, the absorption signatures of the materials are extracted directly from the second-order derivative of the phase of the sample beam with respect to frequency. This technique provides a straightforward and fast solution to solve the phase-retrieval problem in reflection fime-domain spectroscopy (RTDS) and eliminates the “misplacement error”.

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中图分类号:O434.13

DOI:10.3788/cjl201138.s111004

所属栏目:太赫兹技术

责任编辑:李文喆  信息反馈

基金项目:国家自然科学基金(11004140)资助课题。

收稿日期:2011-08-01

修改稿日期:2011-09-15

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作者单位    点击查看

张亮亮:首都师范大学物理系, 北京 100048北京理工大学光电工程系, 北京 100081
钟华:首都师范大学物理系, 北京 100048
邓朝:首都师范大学物理系, 北京 100048
张存林:首都师范大学物理系, 北京 100048
赵跃进:北京理工大学光电工程系, 北京 100081

联系人作者:张亮亮(zhlliang@126.com)

备注:张亮亮(1979—),女,副研究员,主要从事太赫兹光谱和成像等方面的研究。

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引用该论文

Zhang Liangliang,Zhong Hua,Deng Chao,Zhang Cunlin,Zhao Yuejin. Terahertz Wave Reference-Free Spectroscopic Analysis[J]. Chinese Journal of Lasers, 2011, 38(s1): s111004

张亮亮,钟华,邓朝,张存林,赵跃进. 太赫兹波不依赖参考信号光谱分析[J]. 中国激光, 2011, 38(s1): s111004

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