抄録
An optical system has been proposed for monitoring the vibration amplitude of a plumbing from a distant position. The system was composed of a sensor head including a white light source, retro-reflector, a CCD camera, and a data processing system including a computer and a display. It was found from the experiment that a commercial CCD camera with an pixel size of 7.4 µm × 7.4 µm, 3.5 × 105 pixels, a camera size of 4.88 mm × 3.6 mm, and a focal length of 51.8 mm is sufficient to obtain a spatial resolution of 0.2 mm for a vibration amplitude in an observed plane of 135 mm in width and 101 mm in height at a distance of 1.43 m from the plumbing. For such a practical applications in a manufacturing plant as a camera position of 10 m from the observed plane, the spatial resolution decreases to 1.4 mm, but the observed plane becomes approximately 942 mm × 707 mm.
