J Korean Soc Hazard Mitig 2018; 18(1): 209-216  https://doi.org/10.9798/KOSHAM.2018.18.1.209
Observation of Desiccation Cracks Using Femto Second Terahertz Pulse-Laser
Lee, Gi-Jun*, and Kwon, Tae-Hyuk**
*Member, Ph.D. Candidate, Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology
**Member, Assistant Professor, Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology
Correspondence to: Member, Assistant Professor, Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (Tel: +82-42-350-3628, Fax: +82-42-350-3610, E-mail: t.kwon@kaist.ac.kr)
Received: September 30, 2017; Revised: October 18, 2017; Accepted: November 20, 2017; Published online: January 31, 2018.
© The Korean Society of Hazard Mitigation. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Studies for analysis and monitoring to prevent drought have been conducted. However, most of the studies carried out mainly from the meteorological and hydrological perspectives, and there is a lack of research on the observation of soil changes caused by drought. Therefore, in order to minimize or prevent the crop damage caused by desiccation cracks caused by persistent drought, and damage to farmers and to structures, electromagnetic waves in the terahertz region was used to investigate the moisture condition of the soil materials using femto second terahertz pulse-laser. Transmittance, reflectance, extinction, and extinction coefficient of the soil samples with water content for terahertz frequencies were calculated and THz images of desiccation cracks of the clay were measured.
Keywords: Desiccation Crack, Soil, Terahertz


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