The application of holographic interferometry to the analysis of vibrating fiat surfaces is now a widespread and very powerful experimental technique.
This study extends holographic interferometry to the vibration analysis of curved surfaces. To verify that a single hologram was sufficient for the quantitative determination of vibration amplitudes of curved surfaces, with use of the time-averaged method, two holograms were made simultaneously of the same vibrating circular cylinder and compared with one another. The results showed that a single hologram is sufficient for obtaining quantitative data within a limited accuracy since the plane of localization of the fringes was not exactly coincident with the cylinder surface. Experimentally the error was found to be negligible until both the cylinder illumination and viewing angles became simultaneously larger than 50 degrees.
Live fringe visualization of the vibrations of the same circular cylinder from a single hologram was also quite feasible. However, due to inherent problems of unwanted initial fringes, quantitative data was difficult to obtain. By intentionally introducing initial fringes in a controlled manner, live nodal line visualization and live relative phase information was possible.