太赫兹时域光谱分析中回波滤除方法研究
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清华大学工程物理系,清华大学工程物理系,清华大学工程物理系

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清华大学自主科研专项(2010THZ05);科技部项目(2010DFR10250)


Investigation on the removal of echo signals in terahertz time-domain spectroscopy
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Department of Engineering Physics, Tsinghua University,Department of Engineering Physics, Tsinghua University,Department of Engineering Physics, Tsinghua University

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    摘要:

    回波处理是提高太赫兹时域光谱系统频谱分辨率的重要方法.为了研究样品存在非线性吸收情况下的回波滤除方法,在解卷积算法的基础上考虑介质对太赫兹脉冲的吸收情况和群延迟效应,将已有算法所需的四个参数缩减为与样品种类、厚度无关的两个参数,进一步提高了太赫兹光谱恢复的准确度.经实验验证,该方法可有效滤除太赫兹时域光谱系统中的GaAs天线基底以及ZnTe探测晶体产生的回波,将时间窗宽度增加一倍,使系统频谱分辨率提高到20 GHz.

    Abstract:

    Echo removal is an important way to improve the spectral resolution of terahertz time-domain spectroscopy. In order to study the echo removal method for the cases of nonlinear absorbent samples, the absorption and group delay effects were considered based on de-convolution algorithm. Two of the four parameters needed in conventional algorithms were abandoned and the remaining two are not related to the exact material and thickness of the sample, which improves the accuracy of terahertz spectrum recovery. Results show that the presented algorithm can eliminate echoes generated by GaAs antenna and ZnTe detection crystal effectively. The width of the time window is doubled so that the spectral resolution is improved up to 20 GHz.

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王凌辉,王迎新,赵自然.太赫兹时域光谱分析中回波滤除方法研究[J].红外与毫米波学报,2013,32(3):265~270]. WANG Ling-Hui, WANG Ying-Xin, ZHAO Zi-Ran. Investigation on the removal of echo signals in terahertz time-domain spectroscopy[J]. J. Infrared Millim. Waves,2013,32(3):265~270.]

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  • 收稿日期:2012-01-05
  • 最后修改日期:2012-05-04
  • 录用日期:2012-05-07
  • 在线发布日期: 2013-06-14
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