Vibration Analysis and Nondestructive Testing Using Holographic Techniques.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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Real-time holograms were made of Aluminum rectangular plates. The plates were cyclically vibrated with a piezoelectric driver to allow the fundamental frequencies to be measured and the mode shapes observed. These results were compared with theoretical frequency calculations. The plates were flawed by three different methods, and real-time holograms were again made. The resonant frequencies of each plate were recorded, and each mode shape was observed. A comparison between the plates before and after the flaws was made to determine the applicability of holography to the nondestructive testing of vibrating objects. Results indicate that holographic nondestructive testing HNDT of vibrating objects shows great promise for future applications. Author
- Metallurgy and Metallography