Spectroscopy and Spectral Analysis, Volume. 30, Issue 12, 3169(2010)
Joint Time-Frequency Analysis for Removing the Spectral Interference of Terahertz
Conventional Fourier-transform mixes the frequency components of the entire temporal terahertz waveform in one frequency domain; therefore, it cannot distinguish the terahertz frequency in the main pulse from the noise frequency in the pulse tail. Thus traditional Fourier-transform produces inconsistent spectra from different scanning lengths of terahertz pulse. And the interference spectrum appears when the THz echo pulse is recorded. The authors applied wavelet-transform and removed the inconsistent spectra and the interference spectra. Wavelet-transform technique exhibited the local frequency of THz in different time locations. This technique would find applications in THz time-resolved spectroscopy.
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SUN Qing, DENG Yu-qiang, CAO Shi-ying, YU Jing, LIU Feng, WANG Chang-lei, XING Qi-rong. Joint Time-Frequency Analysis for Removing the Spectral Interference of Terahertz[J]. Spectroscopy and Spectral Analysis, 2010, 30(12): 3169
Received: Jan. 31, 2010
Accepted: --
Published Online: Jan. 26, 2011
The Author Email: Qing SUN (sunqing@nim.ac.cn)
CSTR:32186.14.