The size of this camera is 86 mm 44 mm 128 mm. The weight is 0.66 kg. The effective pixel size is 2,048 1,024 pixels. The frame rate is 19.8 fps with a high-resolution mode (2,048 1,024 pixels), 117 fps with a normal mode (512 512 pixels), and 288 fps with a high-speed mode (128 128 pixels). 22.3 Experiment 22.3.1 Displacement Measurement Using a Cantilever An application on dynamic deformation measurement of a cantilever is demonstrated. Figure 22.4 shows an experimental composition. The length of the cantilever is 1 m. Two-dimensional grating patterns are pasted on the cantilever. The pitch of the grating is 10 mm. The quantity of displacement to give the right-side end of the cantilever is 1 mm. The vibration to give a cantilever is 1 Hz. Two laser displacement meters are installed above the cantilever as Point A and Point B. The frame signal of the sampling Moire and the output of the laser displacement meters are recorded by a data logger with a sampling period of 1 ms. Camera angles are 0 , horizontal direction 60 , and vertical direction 30 and horizontal direction 30 such as Figs. 22.5 and 22.6. The frame rate of the camera is 50 fps and the exposure time is 5 ms. Figure 22.7 shows captured images by the sampling Moire camera. Figure 22.8 shows images of displacement distribution measured by the sampling Moire camera. Figure 22.9 shows results of displacement distribution measured by the Fig. 22.3 Composition of sampling Moire camera which can measure dynamic displacement measurement in real-time. (a) Photograph (b) Block diagram Fig. 22.4 Experimental composition of dynamic displacement measurement by using sampling Moire camera. (a) Illustration (b) Cantilever (The length is 1 m) 200 D. Tomita et al.
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