The history of holographic vibration analysis

This paper describes the evolution of holographic vibration analysis from its discovery in 1964 to its present form as a technique of digital holography. The speckle interferometer is discussed as a replacement for real-time holographic interferograms and electronic speckle pattern interferometry (ESPI) as the precursor to digital holography. The development of methods for converting vibratory (Jo) fringe patterns into numerical data is discussed along with applications to Modal Assurance Criteria (MAC) calculations. Finally, an application is presented for vibratory strain measurement in one dimension.