Results 281 to 290 of about 8,935,486 (331)
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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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IEEE transactions on power electronics, 2019
This paper presents a two-segment motor system powered by two inverters with phase-shift pulsewidth modulation (PWM) to fulfill the purpose of low-torque ripple and vibration noise.
Xun Han +4 more
semanticscholar +1 more source
This paper presents a two-segment motor system powered by two inverters with phase-shift pulsewidth modulation (PWM) to fulfill the purpose of low-torque ripple and vibration noise.
Xun Han +4 more
semanticscholar +1 more source
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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IEEE transactions on industrial electronics (1982. Print), 2019
In this paper, a cooperative triple-phase-shift (CTPS) control for the isolated dual active bridge dc–dc converter is proposed first to eliminate the dual-dc side flow back currents.
Fengjiang Wu, Fan Feng, H. Gooi
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In this paper, a cooperative triple-phase-shift (CTPS) control for the isolated dual active bridge dc–dc converter is proposed first to eliminate the dual-dc side flow back currents.
Fengjiang Wu, Fan Feng, H. Gooi
semanticscholar +1 more source
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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IEEE transactions on microwave theory and techniques, 2019
In this article, a geometric method, along with the concept of the reference circle, is proposed for the analysis of reflective-type phase shifter (RTPS). Comprehensive analyses of popular reflective loads, including capacitive load (CL), resonated load (
Peng Gu, Dixian Zhao
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In this article, a geometric method, along with the concept of the reference circle, is proposed for the analysis of reflective-type phase shifter (RTPS). Comprehensive analyses of popular reflective loads, including capacitive load (CL), resonated load (
Peng Gu, Dixian Zhao
semanticscholar +1 more source