LaserDopplerInterferometern

Laser Doppler Interferometry (LDI) is a non-invasive optical technique used to measure the velocity of moving particles or surfaces. It is based on the Doppler effect, which describes the change in frequency of a wave for an observer moving relative to the wave source. In LDI, a laser beam is split into two coherent beams, which are then directed towards the target surface. The scattered light from the target is collected and recombined, creating interference patterns. The frequency shift in these patterns is proportional to the velocity of the target surface. LDI is widely used in various fields, including fluid dynamics, biomedical engineering, and materials science, for applications such as blood flow measurement, surface vibration analysis, and non-destructive testing. It offers advantages like high sensitivity, real-time measurement, and the ability to operate in harsh environments. However, it also has limitations, such as the need for a clear line of sight and potential interference from ambient light.