Abstract
A method has been developed to make a record of the vibration modes of a rotating circular disk, in our case a circular saw, at various rotating speeds. A picture is produced on a cathode-ray-tube display and photographed. The vibrations are measured by means of a sensor at a variable position along a radius of the saw. The signal is fed to the intensity input of the display, the oscilloscope beam being swept circularly in synchronism with the saw to derotate the pattern. Exposures are made at successively increasing sensor radius and corresponding sweep radius. The picture obtained is less detailed than a holographic picture, but the method is easy to apply, even for rotating objects with a certain skewness.
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