Michelson interferometer

thingiverse

This interferometer, modeled after the Michelson design, measures relative motion at nanometer precision and accuracy. It does so by counting interference fringes from constructive/destructive light interference. A transition denotes a movement equivalent to half the wavelength of the used light. The device consists of a laser holder, laser, beam splitter, two mirrors, a diffusing lens, optional photodetector, and a framework for component positioning. It's ideal for 3D printer feedback systems, being based on kinematic mirror mount principles. The design includes images demonstrating vertical interferometer mounting attempts for load-displacement testing. Future plans involve determining stroke using a piezo buzzer behind one of the mirrors. For assembly, print two laserHolder01 parts for laser mounting, three mm052 kinematic mirror mounts (one for the lens) with 2 M3 screws, two M3 nuts, and two 3x3mm magnets; use highly polished mirrors or silicon pieces. Mount a 45-degree kinematic mirror mount for the beam splitter, a purchased 50% beam splitter, or a self-prepared half silvered mirror using chromium. Assemble T-slot extrusion with T-Nut fastener screws and align components according to Wikipedia diagrams. However, avoid debugging in noisy environments as it may cause vibration interference.