Development of Sampling Moire Camera for Landslide Prediction by Small Displacement Measurement

Nakabo, Makiko; Fujigaki, Motoharu; Morimoto, Yoshiharu; Sasatani, Yuji; Kondo, Hiroyuki; Hara, Takuya

doi:10.1007/978-1-4614-0228-2_39

Cited by 5 publications

(2 citation statements)

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“…This method uses a charge-coupled device (CCD) or complementary metal-oxide semiconductor (CMOS) sensor to capture a single image of a specimen grating of known pitch during deformation. Only one image is handled to evaluate the phase distribution by generating multiple phase-shifted moiré patterns by the thinning-out, down-sampling, and interpolation of the sequential pixels through phase analysis [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Through the phase difference of the moiré fringe prior to deformation to that of post-deformation, the displacement distribution is attained.…”

Section: Introductionmentioning

confidence: 99%

“…A sampling moiré camera is a compact system with a CMOS sensor, memory unit, and processing unit that analyzes the grating images and provides output in real-time. The laboratory part of the experiment for close-range displacement conducted in a small displacement detection system to measure landslide [8] forms the basis for this study. The use of a translation guide to assure the accuracy of the displacement measurement has been carried out, similar to the study that uses an electronic motion stage.…”

Section: Introductionmentioning

confidence: 99%

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CCTV Camera Array for the Displacement and Strain Measurement of a Beam Specimen in a Laboratory

2022

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The available conventional sensors, like displacement transducers, used in the Structural Engineering Laboratory are expensive. In addition to that, the need for data acquisition devices also escalates the expense invested in point contact measurement systems. The recent appeal of vision-based measurement and the search for cost-effectiveness has led to an exploration of the established sampling moiré method using cheap closed-circuit television (CCTV) cameras as a viable option. The sampling moiré method is simple and analyzes the displacements from grating images by a phase-shifting method. Several trial experiments were conducted, which demonstrated that the setup is at least as accurate as the traditional measuring system. An experiment was conducted on a steel I-beam for displacement measurement, which displayed satisfactory results. In addition, the setup was also tested for strain measurement, and it has yielded promising results that need fine-tuning. This paper discusses the challenges, findings, and the possibility of incorporating vision-based displacement measurements in laboratory platforms.

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