title: Application of Terahertz Time-Domain Spectroscopy in Detecting Gaps with Different Widths.
abstract: 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.
authors.affiliation: Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum.
authors.forename: Rima
authors.initials: R
authors.lastname: Bao
authors.forename: Zhikui
authors.initials: Z
authors.lastname: Wu
authors.forename: Fang
authors.initials: F
authors.lastname: Wang
authors.forename: Xinyang
authors.initials: X
authors.lastname: Miao
authors.forename: Chengjing
authors.initials: C
authors.lastname: Feng