Results 271 to 280 of about 8,935,486 (331)
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Generic Dynamic Phase-Shift Control for Bidirectional Dual-Active Bridge Converters
IEEE transactions on power electronics, 2021This letter proposes a generic method to model and mitigate the transient dc bias in the transformer winding current and the magnetizing flux linkage of the dual-active bridge (DAB) converter, which is valid for all the most commonly used modulation ...
Jingxin Hu +3 more
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Phase-shifting interferometry with uncalibrated phase shifts
Applied Optics, 2000A computationally efficient algorithm for phase-shifting interferometry with imprecise phase shifts is developed. It permits the use of an uncalibrated phase shifter and is also insensitive to spatial intensity variations. The measurement has both spatial and temporal aspects. Comparisons are made between pixels within the same interferogram, and these
X, Chen, M, Gramaglia, J A, Yeazell
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Phase-shift calibration algorithm for phase-shifting interferometry
Journal of the Optical Society of America A, 2000We propose a novel phase-shift calibration algorithm. With this technique we determine the unknown phase shift between two interferograms by examining the sums and differences of the intensities on each interferogram at the same spatial location, i.e., I1(x, y) +/- I2(x, y). These intensities are normalized so that they become sinusoidal in form.
X, Chen, M, Gramaglia, J A, Yeazell
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Blind phase shift estimation in phase-shifting interferometry
Journal of the Optical Society of America A, 2007A blind phase shift estimation algorithm that allows simultaneous calculation of phases and phase shifts from three or more interferograms is presented. In phase-shifting interferometry, the phase shift errors introduce specific correlations between the calculated background intensity distribution and the fringe component.
Hongwei, Guo, Yingjie, Yu, Mingyi, Chen
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Phase-shift extraction for generalized phase-shifting interferometry
Optics Letters, 2009A simple algorithm for blind extraction of phase shifts is proposed for generalized phase-shifting interferometry from only three interferograms. Based on the statistical property of the object wave, the algorithm calculates approximately the involved phase shifts as initial values. The extraction is further improved by an iterative method, considering
Gao, Peng +5 more
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IEEE transactions on industrial electronics (1982. Print), 2020
A transient dc-bias current due to the voltage-second imbalance of isolated bidirectional dual-active-bridge (DAB) converters for the disturbance in line or load may result in the transformer saturation and oscillations in both sides dc currents.
Qinglei Bu +4 more
semanticscholar +1 more source
A transient dc-bias current due to the voltage-second imbalance of isolated bidirectional dual-active-bridge (DAB) converters for the disturbance in line or load may result in the transformer saturation and oscillations in both sides dc currents.
Qinglei Bu +4 more
semanticscholar +1 more source
A 28–30 GHz CMOS Reflection-Type Phase Shifter With Full 360° Phase Shift Range
IEEE Transactions on Circuits and Systems - II - Express Briefs, 2020This brief presents a millimeter-wave passive reflection-type phase shifter (RTPS) capable of producing a 360° phase shift range with low insertion loss (IL) in 28–30 GHz range.
A. Basaligheh +4 more
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Optics Letters, 2012
We propose an optical element: a phase-shifted Fresnel axicon for generation of multiple Bessel beams. By giving a binary phase modulation to the standard Fresnel axicon, the proposed element is generated. The phase profile of the binary phase modulation is engineered to generate two and three Bessel beams of equal intensities.
Vijayakumar, A., Bhattacharya, Shanti
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We propose an optical element: a phase-shifted Fresnel axicon for generation of multiple Bessel beams. By giving a binary phase modulation to the standard Fresnel axicon, the proposed element is generated. The phase profile of the binary phase modulation is engineered to generate two and three Bessel beams of equal intensities.
Vijayakumar, A., Bhattacharya, Shanti
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Optimal Phase-Shift Control to Minimize Reactive Power for a Dual Active Bridge DC–DC Converter
IEEE transactions on power electronics, 2019In a dual active bridge (DAB) dc–dc converter, modulating the phase-shift ratios can suppress reactive power and increase the efficiency under non-unity voltage gain conditions. Derivation of the optimal phase-shift ratios to achieve the minimum reactive
Shuai Shao +5 more
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Stroboscopic phase-shifting interferometry
Optics Letters, 1987The implementation of a new type of phase-shifting, self-referencing interferometer that simultaneously achieves the phase shift and separation of heams with a stationary diffraction grating is described. The capabilities of stroboscopic interferometry are demonstrated with results from an experiment in which the rapidly varying surface deformations of
O Y, Kwon, D M, Shough, R A, Williams
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