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      https://www.ias.ac.in/article/fulltext/sadh/041/04/0377-0384

    • Keywords

       

      Small displacement; displacement measurement; local calibration; 3D digital image correlation

    • Abstract

       

      There are two methods applied for three-dimensional digital image correlation method to measure three-dimensional displacement. One is to measure the spatial coordinates of measuring points by analyzing the images. Then, the displacement vectors of these points can be calculated using the spatial coordinates of these points obtained at different stages. The other is to calibrate the parameters for individual measuring points locally. Then, the local displacements of these points can be measured directly. This study proposes a simple local three-dimensional displacement measurement method. Without any complicated distortion correction processes, this method can be used to measure small displacement in the three-dimensional space through asimple calibration process. A laboratory experiment and field experiment are carried out to prove the accuracy of this proposed method. Laboratory test errors of one-dimensional experiment are similar to the accuracy of theXYZ table; the error in Z-direction is only 0.0025&#37 of the object distance. The measurement error of laboratory test is about 0.0033&#37 of the object distance for local three-dimensional displacement measurement test. Test and analysis results of field test display that in-plane displacement error is only 0.12 mm, and the out-of-plane error is 1.1 mm for 20 m 9 30 m measuring range. The out-of-plane error is only about 10 PPM of the object distance. These test and analysis results show that this proposed method can achieve very high accuracy under small displacement for both of laboratory and field tests.

    • Author Affiliations

       

      MING-HSIANG SHIH1 SHIH-HENG TUNG2 HAN-WEI HSIAO3 WEN-PEI SUNG4

      1. Department of Civil Engineering, National Chi Nan University, Nan-Tou 545, Taiwan, R.O.C
      2. Department of Civil and Environmental Engineering, National University of Kaohsiung, Kaohsiung 81148, Taiwan, R.O.C
      3. Department of Information Management, National University of Kaohsiung, Kaohsiung 81148, Taiwan, R.O.C
      4. Department of Landscape Architecture, Integrated Research Center for Green Living Technologies, National Chin-Yi University of Technology, Taichung 41170, Taiwan, R.O.C.
    • Dates

       
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