Results 211 to 220 of about 162,262 (264)
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Phase-shifting interferometry by wave amplitude modulation
Optics Letters, 2011A new method for phase-shifting interferometry based on wave amplitude modulation is proposed and discussed. This proposal is based on the interference of three waves, where two waves attend as two reference waves and the other wave attends as a probe wave.
Cruz, Meneses-Fabian +1 more
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Reactance Tube Modulation of Phase Shift Oscillators
Bell System Technical Journal, 1949This paper describes a basic circuit for reactance tube modulation of phase shift oscillators. The design of suitable phase shift oscillators for frequencies from audio through the ultra-high frequencies is discussed. Experimental performance data derived from several types of frequency modulated phase shift oscillators are presented.
F. R. Dennis, E. P. Felch
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Phase shifting interferometry by modulation of the electric field module
SPIE Proceedings, 2011A new method for phase-shifting interferometry based on the wave amplitude modulation is proposed and discussed. This proposal is based on the interference of three waves, where two waves attend as two reference waves and the other wave attends as a probe wave.
Cruz Meneses-Fabian, Uriel Rivera-Ortega
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Linear Measuring Phase Shift Module
2019 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon), 2019The article describes design of a linear measuring phase shift module with a nonuniform running magnetic field developed by the authors. The developed phase shift module is intended for use in information and measurement systems for linear displacement.
V Goryachev +3 more
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Concatenated codes using coded modulation with a phase shift
2012 18th Asia-Pacific Conference on Communications (APCC), 2012A new coded modulation with a phase shift is proposed. The parity bits decide how to shift the signal constellation point of information bits in the transmitter. In the receiver, the phase shift detector estimates how much the constellation points are shifted and then recovers the parity bit.
Mämmelä, Aarne, Kim, Haesik
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Phase shifting mask modulated laser patterning on graphene
Nanotechnology, 2016A one-step graphene patterning method is developed in this paper. A phase shifting mask is used to modulate incident laser beam spatially and generate graphene patterns by laser heating. Periodic graphene nanoribbon and nanomesh structures are fabricated by employing 1D and 2D phase shifting masks, respectively.
Gao, F. +10 more
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Pulsewidth modulator phase shift
IEEE Transactions on Aerospace and Electronic Systems, 1980Phase shift for the ramp-comparator pulsewidth modulator (PWM) between a continuous input control signal and the signal frequency component of the output is analyzed. It is shown that transport lag is not implicit to these PWM systems in general but rather depends upon the existence of explicit delays between the time at which a switching decision is ...
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Higher-order differential phase shift keyed modulation
IEEE Transactions on Communications, 1994Advanced modulation/demodulation techniques which are robust in the presence of phase and frequency uncertainties continue to be of interest to communication engineers. The authors are particularly interested in techniques which accommodate slow channel phase and frequency variations with minimal performance degradation and which alleviate the need for
Deborah van Alphen, William C. Lindsey
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An evaluation of phase-shift analysis of modulated photocurrents
Philosophical Magazine B, 1990Abstract The accuracy and limitations of phase-shift analysis of modulated photocurrents as a means of determining the energy profile of localized states in amorphous semiconductors have been investigated. The basis of the existing ‘recursion procedure’ is reviewed and its deficiencies are revealed by applying the method to computer-generated phase ...
Bruggemann, R. +3 more
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Hyper Phase Shift Keying (HPSK) Modulation
2007 Conference Record of the Forty-First Asilomar Conference on Signals, Systems and Computers, 2007A new modulation technique that uses four orthonormal basis functions is proposed. Using four orthonormal basis functions provides an advantage over most traditional modulation techniques such as quadrature phase shift keying and quadrature amplitude modulation that only possess two degrees of freedom.
James Caldwell, Murali Tummala
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