Analytical Sciences

Abstract − Analytical Sciences, 33(1), 95 (2017).

Application of Terahertz Time-Domain Spectroscopy in Detecting Gaps with Different Widths
Rima BAO,*,** Zhikui WU,*,** Fang WANG,*,** Xinyang MIAO,*,** and Chengjing FENG*,**
*Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum, Beijing 102249, China
**College of Science, China University of Petroleum, Beijing 102249, China
The characterization of fractures is of vital importance for studies in many industries. In the present work, we used terahertz reflection measurements to identify simulated gaps of different widths that resemble fractures. The time interval between pulses (Δt) was proportional to the distance between the interfaces. In addition, fast Fourier transform (FFT) corresponding to the waveforms was also employed to distinguish the gaps. The widths in frequency were found to be inversely proportional to that of the gaps. In general, both terahertz time-domain spectroscopy (THz-TDS) and terahertz frequency-domain spectroscopy (THz-FDS) can achieve the measurement of the gaps of micro size.