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31 March 1989 Real Time Investigation Of Rotating Objects Using ESPI System
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Proceedings Volume 1026, Holography Techniques and Applications; (1989)
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany
Many kinds of vibration, of great concern, occur to rotating structures such as turbines, propellers and brake disks. This paper describes how an electronic speckle patter' interferometry (ESPI) system is combined with the image derotator for the real time investigation of rotating objects. The ESPI + Derotator system is now capable of replacing holographic counterpart in most rotating structure measurements in industry with dramatic improvements in convenience and simplicity of use. A double pulsed Ruby laser illuminates the rotating objects at two positions of its vibration cycle respectively, and a reflective image derotator is used to compensate the rotational motion of the object. The speckle patterns between two laser pulses are correlated as a series of interferometric fringes, which give a picture of the dynamic vibration distribution on the surface of the rotating objects. Such information is valuable for the optimal design or investigation of noise generation.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Boxiang Lu, Harald Abendroth, Heiner Eggers, Eckhardt Ziolkowski, and Xiangyang Yang "Real Time Investigation Of Rotating Objects Using ESPI System", Proc. SPIE 1026, Holography Techniques and Applications, (31 March 1989);

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