Reconstructing the Phase of Wavefront Using Digital Hologram and the Principle of Shearing Interferometry

Xiaofan, 钱晓凡 Qian; Zhan-liang, 王占亮 Wang; Te, 胡特 Hu; Yong′an, 张永安 Zhang

doi:10.3788/cjl20103707.1821

Cited by 2 publications

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“…Obviously, if the reconstructed wavefield can be conducted with shearing interferometry, these phase jump locations can be easily found so the detection of amplitude distribution can also be completed quickly. Reference [8] has presented a method that using a single digital hologram to realize shearing interferometry, and the sensitivity can be adjusted by changing the shearing quantity. Accordingly, this paper proposes a method based on time-average digital holography and the principle of shearing interferometry to complete vibration measurement.…”

Section: Introductionmentioning

confidence: 99%

Vibration measurement based on time-average digital holography and the shearing interferometry

2011

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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 π, 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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Section: Introductionmentioning

confidence: 99%