Comparison of Fourier-transform analysis with wavelet-transform analysis in terahertz time-domain spectroscopy

摘要

In this paper, we applied wavelet-transform to analysis the water vapor absorption spectroscopy in terahertz range, and compared with conventional Fourier-transform analysis in terahertz time-domain spectroscopy. The extracted absorption lines are in excellent agreement with the results of using Fourier-transform analysis. The results show that wavelet-transform analysis of the absorption spectrum delivers accurate absorption lines in THz range. Because the results are shown in a time-frequency domain, it gives a more intuitive image on when the absorption happens at which frequency. Combining wavelet-transform technique with THz-TDS, we hope there births a new spectroscopy: the wavelet-transform terahertz time-domain spectroscopy.