The LSV is the best designed, and the most precise velocity measurement for all metal applications including:
The beam emitting from a laser is split into two beams, with the same intensity each by means of an optical beam splitter. As the laser tube is a reliable light source that transmits only one constant light frequency without any influence by temperature no additional stabilization is necessary. Both beams overlap in the measurement region. They form a measurement spot with an interference pattern with light and dark areas. The distance between the fringes is caused by the angle of the beams and the laser frequency itself.