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6 July 1998 Large-amplitude point vibration measurement with optical fiber moire-based technique
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We describe a technique that is used for the real-time measurement of the vibration of an object point. The technique can be used when the vibration is characterized by a large amplitude, i.e. several millimeters. The technique shows the additional advantages that it requires no special surface treatment and is insensitive to inplane object displacements. In this technique an object point is illuminated by a small diameter beam (at an angle) that is structured with straight parallel fringes. The illuminated object point is then imaged onto a Ronchi ruling. The total light transmitted through the Ronchi ruling is then used to recover the vibration of the object point, in real time, by using well known servo techniques.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jesus D. R. Valera, Pranay G. Sinha, Toshihiko T. Yoshino, and Ole Johan Lokberg "Large-amplitude point vibration measurement with optical fiber moire-based technique", Proc. SPIE 3479, Laser Interferometry IX: Applications, (6 July 1998);

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