Abstract
A new method for vibrational analysis is proposed. It is based on the deblurring of time-averaged Young's fringes inside speckle grains in the image of a vibrational object. A spatial filtered image of the recording of those speckles, modulated by Young's fringes, shows the loci of points of equal vibratory amplitude.
Highlights
Several methods for vibration analysis employing holographic or speckle techniques have been proposed in the last few years [1-5] .There are many differences between all these techniques
The experin1ental arrangement of the speckle methods does not need to be as stable as the holographic ones, and, in general, they are applicable to a larger range of vibration amplitudes
Our purpose is to report a new method that retains the advantages of the speckle methods, but whose sensitivity is greater. This new method is based on the Young's fringes modulated speckle (Y.F.M.S.) that appear when the image of a laser illuminated object is formed by an optical system whose pupil consists of two identical holes [8]
Summary
Several methods for vibration analysis employing holographic or speckle techniques have been proposed in the last few years [1-5] .There are many differences between all these techniques. Several methods for vibration analysis employing holographic or speckle techniques have been proposed in the last few years [1-5] .
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