Abstract
Laser light has widened the horizons of applied interferometry both by simplifying existing techniques and opening up a new field where holography is utilized to provide a master or reference wavefront. Whilst retaining many of the advantages of classical interferometry the new methods are simple in application and will accommodate almost any surface finish. Examples of application include an investigation of performance for pressure transducer diaphragms and the development of an engine rocker design. A slight modification to the technique enables measurement and visualization of vibration amplitudes and modes. Application to a turbo-charger impeller investigation and a turbine blade inspection are given.
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