Large-amplitude point vibration measurement with optical fiber moire-based technique

Jesus D. R. Valera; Pranay G. Sinha; Toshihiko T. Yoshino; Ole Johan Lokberg

doi:10.1117/12.316467

6 July 1998 Large-amplitude point vibration measurement with optical fiber moire-based technique

Jesus D. R. Valera, Pranay G. Sinha, Toshihiko T. Yoshino, Ole Johan Lokberg

Proceedings Volume 3479, Laser Interferometry IX: Applications; (1998) https://doi.org/10.1117/12.316467
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.316467

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