Parallel phase shift method in digital holography

The article presents an analysis of the parallel phase-shifting method for hologram recording and reconstruction using spatial multiplexing. It is demonstrated that this method offers significant advantages over conventional holographic multiplexing techniques. Among the most important benefits of the parallel phase-shifting method is its high speed, as it eliminates the need for sequential exposures, making it suitable for studying dynamic processes such as gas flows in wind tunnels or plasma. Another key advantage of this holographic recording method is its vibration resistance. In this approach, all phase shifts are registered simultaneously. An additional strength of the method is its high resolution, enabling accurate phase reconstruction without distortion. A mathematical model of the parallel phase-shifting method for hologram recording and reconstruction is proposed. The influence of noise on hologram recording quality is analyzed in detail. To address this, a significant portion of the study focuses on optical system calibration, which helps reduce noise impact on the holographic process. An example of calibration results is provided, showing that proper optical system alignment substantially improves holographic process characteristics.