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The use of dynamic holographic interferometry using holocameras and volume holographic optical elements to characterize the orientation and shape of objects, e.g., airplanes and water droplets, are discussed.
The purposes of the paper are threefold: (1) to show the possibility to perform parallel phase-shifting Fizeau interferometry by using a quarter waveplate with high flatness as a reference, (2) to present a comparative study between the phase-shifting algorithm and the off-axis geometry in surface microtopography measurement, and (3) to show the ad...
Simultaneous phase-shifting interferometry (SPSI) can simultaneously obtain multiple phase-shifted interferograms and can realize the dynamic wavefront measurement with the use of a phase-shifting algorithm. From the respect of a beam-splitting technique and phase shift achievement of the phase-shifting units, research progress on spatial phase shi...
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... In this paper, we show how spiral fringes can be achieved by blocking Bessel beams and how such spirals can be used in a single-shot phase-shifting common-path interferometer for phase extraction [17] [18]. A method to simultaneously grab four shifted patterns with modulation of polarization has been used [18]. ...
... At the output, a quarter wave-plate with axis at 45° modifies the linear polarization of the beams into two circular polarizations of opposite rotation. These beams enter the 4 f 2 system with a phase grid G((J,v) at its Fourier plane, thereby forming a two window phase grid interferometer (TWPGI) [17] ...
A method to obtain spiral fringes and embedded vortices is presented. Both beam Bessel obstruction and interference with a reference wave are involved. Corresponding phase reconstruction is achieved with single shot phase-shifting interferometry.
This research describes a proposal of a single-shot interferometer with four interferograms incorporating the usage of phase vortices of unitary topological charge. The system features vortices generated with a LCoS as the system’s transfer function. By employing polarization phase shifting techniques and field replication methods several copies of the interferogram of interest are achieved, each copy with its prescribed phase shift. Experimental results of wrapped optical phases calculated by using a four-step algorithm are shown, as well as a discussion of the used deconvolution method to recover the unwrapped phase. In order to show the feasibility of the proposal, experimental results corresponding to the discrimination of peaks or valleys are presented and a comparison with the zero topological case.
