Wavelet Power Spectrum Estimation for High-resolution Terahertz Time-domain Spectroscopy
Wavelet Power Spectrum Estimation for High-resolution Terahertz Time-domain Spectroscopy
复制标题
DOI：
10.3807/josk.2011.15.1.103
复制
发表时间：
2011-03-01
影响因子：
--
通讯作者：
Yee, Dae-Su
中科院分区：
文献类型：
--
作者：
Kim, Youngchan;Jin, Kyung Hwan;Yee, Dae-Su
最近报道的异步光采样太赫兹(THz)时间域光谱学由于具有较长的时间延迟窗口而使得高分辨率光谱学成为可能。然而，跟随主脉冲的长持续尾部信号通常是在时间域波形中测量的，导致在高分辨率太赫兹幅度谱上高于背景噪声电平的频谱波动。这里，我们采用了小波功率谱估计技术(WPSET)，在不牺牲频谱特征的情况下，有效地消除了频谱波动。通过对水蒸气透射谱的研究，验证了WPSET的有效性。
Recently reported asynchronous-optical-sampling terahertz (THz) time-domain spectroscopy enables high-resolution spectroscopy due to a long time-delay window. However, a long-lasting tail signal following the main pulse is often measured in a time-domain waveform, resulting in spectral fluctuation above a background noise level on a high-resolution THz amplitude spectrum. Here, we adopt the wavelet power spectrum estimation technique (WPSET) to effectively remove the spectral fluctuation without sacrificing spectral features. Effectiveness of the WPSET is verified by investigating a transmission spectrum of water vapor.