Journal of the Regional Association of Architectural Institute of Korea (대한건축학회연합논문집)

The Regional Association of Architectural Institute of Korea (대한건축학회지회연합회)
권호 표지

Verification of Long-distance Vision-based Displacement Measurement System

장거리 영상기반 변위계측 시스템 검증

  • 김홍진 (경북대학교 건설환경에너지공학부) ;
  • 허석재 (단국대학교 건축공학과) ;
  • 신승훈 (경북대학교 건설환경에너지공학부)
  • Received : 2018.10.18
  • Accepted : 2018.11.05
  • Published : 2018.12.25
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Abstract

The purpose of this study is to verify the long - range measurement performance for practical field application of VDMS. The reliability of the VDMS was verified by comparison with the existing monitoring sensor, GPS, Accelerometer and LDS. It showed the ability to accurately measure the dynamic displacement by tracking a motion of free vibration of target. And using the PSD function of measured data, the results in the frequency domain were also analyzed. We judged that VDMS is able to identify the higher system mode and has sufficient reliability. Based on the reliability verification, we conducted tests for long-distance applicability for actual application of VDMS. The distance from the stationary target model structure was increased by 50m interval, and the maximum distance was set to 400m. From the distance of 150m, the image obtained by the commercial camcorder has an error in the analysis, so the measured displacement comparison was performed between the LDS and the refractor telescope measurement results. In the measurement results of the displacement area of VDMS, the data validity was deteriorated due to the data shift by the external force and the quality degradation of the enlarged image. However, even under the condition that the effectiveness of the displacement measurement data of VDMS is low, the first mode characteristic included in the free vibration of the object is clearly measured. If the influence from the external environment is controlled and stable data is collected, It is judged that reliability of long-distance VDMS can be secured.

Keywords

Acknowledgement

Supported by : 국립재난안전연구원

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