19 August 2011 Vibration measurement based on time-average digital holography and the shearing interferometry
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Abstract
The detection of amplitude distribution of the conventional time average holography is realized through the reconstructed image intensity, however, no satisfactory results can be often obtained because there are many noise influences such as speckle noise. As there are only two values for the phase of the first kind of zero-order Bessel function, namely 0 and μ, we can determine the amplitude distribution through the reconstructed field phase. And this method is better than the conventional, but it takes a longer time. This paper presents a new method that through introducing the shearing principle to vibration measurement of time average digital holograph, we can detect the amplitude distribution rapidly by directly using the shearing interferogram to find out the phase stepping region, and this method need no phase unwrapping operation. Simulation computation and experiment results show that the time new method need for vibration measurement is shorter than that of reconstructed field phase, and the measurement effect is better than that of reconstructed image intensity.
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Fan Rao, Fan Rao, Xiao-fan Qian, Xiao-fan Qian, Zu-jie Peng, Zu-jie Peng, } "Vibration measurement based on time-average digital holography and the shearing interferometry", Proc. SPIE 8192, International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging, 81920L (19 August 2011); doi: 10.1117/12.898563; https://doi.org/10.1117/12.898563
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