Vibration Phase Based Ordering of Vibration Patterns Acquired With a Shearing Speckle Interferometer and Pulsed Illumination

摘要: Harmonic vibrations of diffusely reflecting objects can be visualized using inteferometric methods such as holography or speckle interferometry. The vibrating object illuminated by a CW laser pulse laser. When and exposing the holographic medium CCD camera for period that is relatively long compared to vibration period, time average interferograms are obtained, while phase information lost. used two exposures with appropriate timing made obtain correlation fringes after subtraction.