phase shifting techniques

Phase shifting techniques are methods used in optics and signal processing to measure and analyze light or wavefront distortions. By deliberately changing the phase (the position of the wave's peaks and troughs) of a reference wave in small steps, we can compare these shifted waves with a target wave to determine its shape or deviations. This process helps us create detailed, accurate maps of surfaces or wavefronts, leading to precise measurements in applications like imaging, laser calibration, and adaptive optics. Essentially, phase shifting enhances our ability to detect subtle differences in wave patterns through controlled phase adjustments.