Work

Measurement of out-of-plane displacement in time series using laser lines and a camera with a diffraction grating

Year: 2021

Type: article

Abstract: The inspection of infrastructure such as road bridges requires an efficient method for measuring the out-of-plane displacement. In this study, a method was proposed that uses laser lines to measure the time series of the out-of-plane displacement. An image of parallel laser lines with the same spacing is easily generated by installing a diffraction grating in front of the imaging lens of a camera. The displacement can then be obtained from phase analysis of the parallel laser lines. Laboratory experiments were performed to confirm the principle of the proposed method. Then, using the proposed method, field experiments of measuring the displacement time series of an actual road bridge were also done. The results of laboratory experiment confirmed that the principle of the proposed method was correct, and results of field experiment shown that displacement was measured at a very high resolution.

Source: Optics and Lasers in Engineering

DOI: 10.1016/j.optlaseng.2021.106891

Authors: Wei Jiang, Motoharu Fujigaki, Yuji Uchida, Shota Funaki

Institution: University of Fukui

Language: English

Topic: Optical measurement and interference techniques

Subfield: Computer Vision and Pattern Recognition

Field: Computer Science

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: hybrid

Estimated APC paid: $2,650