Instrument for measuring the amplitude of vibration of a vibrating object

摘要

An instrument for measuring the amplitude of vibration of a vibrating object consists of a first optical system for periodically projecting the image of a grating onto the vibrating object and second optical system having an optical axis intersecting that of the first optical system in the vicinity of the object, for sharing the image projected on and reflected from the object and recording the shared image on a photographic film. The measurement of the amplitude is obtained in the form of a moire pattern.