phase shifting interferometry

Phase shifting interferometry is an advanced optical technique used to measure small displacements, wavelengths, or surface shapes with high precision. It involves shining a light source, typically a laser, onto a sample and capturing the light that reflects off it. By slightly changing the phase of the light at specific intervals, the resulting interference patterns are analyzed. These patterns reveal very fine details that can't be seen with the naked eye. This method is widely used in fields like engineering, metrology, and optics for quality control, surface analysis, and in developing precise instruments.