Evaluation of Cavity Characterization Using Infrared Thermal Images

Byeong-Su Jang; Young-Seok Kim; Se-Won Kim; Hyun-Jun Choi; Hyung-Koo Yoon

doi:10.7843/kgs.2023.39.7.69

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2023 Vol.39, Issue 7 Preview Page

Evaluation of Cavity Characterization Using Infrared Thermal Images 적외선 이미지를 이용한 지하공동 평가

31 July 2023. pp. 69-76

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Abstract

Cavity causes settlement and its remediation after an accident results in significant time and economic losses. This study aims to experimentally evaluate the prospect of using infrared camera to detect and measure underground subsidence. Emissivity is necessary to detect the energy emitted from an object and accurately assess temperature using an infrared camera. The emissivity in laboratory tests is fixed to evaluate a reasonable distance between the infrared camera and the object, and temperature values are assessed at various distances. In field experiments, the cavity of the field experiment is simulated using a PVC pipe with a diameter of 5 cm, artificially buried at depths of 5 and 25 cm from the surface. The infrared camera measurements are taken from 4 PM to 3 PM of the next day (a total of 23 h). The analysis included the time-series temperature distribution and the cooling rate index assessment, which represents the temperature change rate per unit of time. The results showed that various temperature trends are observed depending on the location of the subsidence. This study demonstrates that the infrared camera can be used to assess the condition of the subsurface.

Keywords

Cavity

Emissivity

Infrared camera

Thermal conductivity

지반의 공동은 지반 침하를 야기하고 사고 발생 후에는 이를 보수하기 위해서도 많은 시간적및 경제적 손실이 발생한다. 본 연구에서는 적외선 카메라를 새로운 계측 수단으로 활용하여 지하 공동의 탐지 가능성을 실험적으로 평가하고자 하였다. 적외선 카메라로 정확한 온도를 평가하기 위해서는 물체에서 방출하는 에너지를 탐지해야 하며 이때 방사율 값이 필수적으로 이용된다. 현장 실험 시 적외선 카메라와 물체의 합리적인 거리를 평가하기 위하여 방사율을 고정하고 거리 변화에 따른 온도 값을 평가하였다. 이를 통해 현장 실험 조건을 구성하였다. 현장 실험의 동공은 5cm 직경의 PVC pipe 관으로 모사하였으며, 지표를 기준으로 5cm와 25cm에 인위적으로 매설하였다. 적외선 카메라는 오후 4시부터 다음날 오후 3시까지(총 23시간) 측정하였으며, 온도의 시계열 분포뿐만 아니라 단위 시간당 변화량인 cooling rate index 방법을 통해서도 분석하였다. 분석결과는 공동 위치에 따라 온도 변화 추세가 상이하게 나타났으며, 이를 통해 적외선 카메라로 지반 내부의 상태를 평가할 수 있는 가능성을 보여준다.

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Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 39
No :7
Pages :69-76
Received Date : 2023-07-07
Revised Date : 2023-07-21
Accepted Date : 2023-07-21
DOI :https://doi.org/10.7843/kgs.2023.39.7.69

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

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