The theoretical researches of spatial-carrier phase shifting;

In dynamic measurement field,when using digital speckle pattern interferometry,we always deal phase with time-average method and spatial carrier phase-shifting method.

In the reviewing, temporal phase-shifting method, spatial phase-shifting method, spatial carrier phase-shifting method, Fourier transform method and phase unwrapping are concerned.

An adaptive spatial-carrier phase-shifting algorithm;

By MATLAB simulation,the influence of variations of M modulation rate on output phase and line voltages are analyzed based on carrier phase-shifting control,and the variations of total distortion rate of harmonic are also analyzed.

in this paper, based on the topology of cascaded multilevel converter and its modulation technique of carrier phase-shifting, Digital Signal Processor (DSP) and Complex Programmable Logic Divice (CPLD) consist of PWM pulse generator, the paper solves the problem of driving pulse interface between Digital Signal Processor (DSP) and switching devices.

For multiple back-to-back four-quadrant converter,a modified SPWM technique is combined with carrier phase-shifting control,which reduces current harmonic and enhances power exchange ability.

For two-bridge MSI,the authors propose a method called CPS-SPWM,which combines carrier phase shifted(CPS) with sinusoidal pulse width modulation(SPWM),to increase the equivalent switching frequency under low switching frequency and make the inverter bridges working more synchronically for better e.