13 September 2012 Dynamic displacement distribution measurement of deforming structure using sampling moiré camera
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A Sampling moire method is one of the convenient phase analysis methods. The accuracy of phase difference analysis is from 1/100 to 1/1000 of the grating pitches. This method is useful to a real-time deformation measurement because the two-dimensional phase analysis can be performed from a single shot two-dimensional grating image. We developed a sampling moire camera which can analyze the two-dimensional displacement images in real-time by using the sampling moire method. The camera is composed of a C-MOS sensor, an FPGA, memory modules and a USB interface. A two-dimensional grating image on the object is taken by the CMOS sensor in synchronization with a camera trigger. The algorithm mentioned previous was written into the FPGA. The two-dimensional grating images analyzed from one-shot image by the FPGA and outputted in real-time. It is confirmed that the camera can measure static displacement in high accuracy. However, it is not confirmed that the camera can measure dynamic displacement in high accuracy. In this paper, the accuracy of dynamic displacement measurement by using sampling moire camera is confirmed. And the sampling moire camera was applied to measure dynamic displacement of train bridges while a train is passing.
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Takuya Hara, Takuya Hara, Motoharu Fujigaki, Motoharu Fujigaki, Yorinobu Murata, Yorinobu Murata, } "Dynamic displacement distribution measurement of deforming structure using sampling moiré camera", Proc. SPIE 8494, Interferometry XVI: Applications, 84940C (13 September 2012); doi: 10.1117/12.924048; https://doi.org/10.1117/12.924048


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