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Phase-shift-amplified interferometry
Optics Letters, 2018We present a new technique for improving the sensitivity of an interferometer, phase-shift-amplified interferometry (PAI), which is based on two embedded interferometers. The internal interferometer, which is biased in anti-phase, amplifies the phase shift; the external interferometer converts this into an amplified intensity shift. PAI can improve the
Moshe Ben Ayun +3 more
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Reference phase shift determination in phase shifting interferometry
Optics and Lasers in Engineering, 1995Abstract The phase shifting technique has recently seen application to many types of interferometers, including holographic, speckle and moire systems for strain analysis. In these applications, close control of the phase shifts may be impossible due to the effect of mechanical vibrations, and this presents difficulties when extracting the phase ...
K.E. Perry, J. McKelvie
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Phase-shifting Gabor holography
Optics Letters, 2009We present a modified Gabor-like setup able to recover the complex amplitude distribution of the object wavefront from a set of inline recorded holograms. The proposed configuration is characterized by the insertion of a condenser lens and a spatial light modulator (SLM) into the classical Gabor configuration.
Vicente, Micó +3 more
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Phase-shifting speckle interferometry
Applied Optics, 1985Speckle patterns have high frequency phase data, which make it difficult to find the absolute phase of a single speckle pattern; however, the phase of the difference between two correlated speckle patterns can be determined. This is done by applying phase-shifting techniques to speckle interferometry, which will quantitatively determine the phase of ...
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IEEE Transactions on Biomedical Engineering, 1975
The influences of phase shifts are extremely important in the determination of filtered waveforms and therefore in the interpretation of many biosignals. Low frequency shifts from high pass filtering, for example, are significant because large time displacements result from small phase deviations in the vicinity of the corner frequency.
R L, Longini +3 more
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The influences of phase shifts are extremely important in the determination of filtered waveforms and therefore in the interpretation of many biosignals. Low frequency shifts from high pass filtering, for example, are significant because large time displacements result from small phase deviations in the vicinity of the corner frequency.
R L, Longini +3 more
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Phase-shifting digital holography
Optics Letters, 1997A new method for three-dimensional image formation is proposed in which the distribution of complex amplitude at a plane is measured by phase-shifting interferometry and then Fresnel transformed by a digital computer. The method can reconstruct an arbitrary cross section of a three-dimensional object with higher image quality and a wider viewing angle ...
I, Yamaguchi, T, Zhang
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Continuous phase-shifting holography
Journal of the Optical Society of America A, 2019A scanning full-field interferometer is a key device in the optical scheme of digital hyperspectral hologram registration. Behind the theory of hyperspectral holography is Fourier transform spectroscopy, wherein the set of spectrally resolved complex amplitudes of the object’s hyperspectral field is obtained via the Fourier transform of a series of ...
Sergey G. Kalenkov +2 more
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Dynamic phase-shifting photoelasticity
Applied Optics, 2001The application of phase-shifting photoelasticity to a real-time dynamic event involves simultaneous recording of the four phase-shifted images. Here an instrument, believed to be novel, is developed and described for this purpose. Use of a Multispec Imager is introduced into digital photoelasticity for the first time to our knowledge.
A, Asundi, L, Tong, C G, Boay
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Phase-shift coherence holography
Optics Letters, 2010We propose and experimentally demonstrate a new reconstruction scheme for coherence holography using computer-generated phase-shift coherence holograms. A 3D object encoded into the spatial coherence function is reconstructed directly from a set of incoherently illuminated computer-generated holograms with numerically introduced phase shifts.
Dinesh N, Naik +3 more
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Parallel phase-shifting color digital holography using two phase shifts
Applied Optics, 2009We propose parallel phase-shifting color digital holography using two phase shifts. This technique enables the instantaneous acquisition of three-dimensional information of a moving color object. The interference fringe image that contains six holograms with two phase shifts for three wavelengths is recorded by a single shot exposure.
Takashi, Kakue +8 more
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