Quasi-equal-path electronic speckle pattern interferometric system.
A quasi-equal-path electronic speckle pattern interferometric system that uses the polarization property of a diffusing object is presented. The fringe pattern is extremely stable with high visibility. Phase stepping in this arrangement is accomplished by translating the glass plate used for obtaining the reference beam. The only alignment that is necessary is that for obtaining a uniform field of view. This experimental arrangement demonstrates high efficiency of laser power usage. An equation for longitudinal alignment tolerance is also obtained.
Peng
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S
Joenathan
C
C
Khorana
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BM