| 光谱学与光谱分析 |
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| Joint Time-Frequency Analysis for Removing the Spectral Interference of Terahertz |
| SUN Qing1, DENG Yu-qiang1*, CAO Shi-ying1, YU Jing1, LIU Feng2, WANG Chang-lei2, XING Qi-rong2 |
1. Optics Division, National Institute of Metrology, Beijing 100013, China
2. School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China |
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Abstract 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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Received: 2010-01-31
Accepted: 2010-03-01
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Corresponding Authors:
DENG Yu-qiang
E-mail: yqdeng@nim.ac.cn
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