Position measuring device and method for operating a position measuring device

摘要

The light source (21) is constructed as a semiconductor laser with coherence length exceeding 200 mu m. It is pulsed for intervals of 5 - 50 ns, in single-mode operation. It is constructed as a distributed feedback (DFB) or distributed Bragg reflector (DBR) laser. The light source is constructed as a mode-coupled semiconductor laser or as a mode-coupled solid body laser. The divided beam paths are designed asymmetrically for differing wavelengths. The resulting beams are superimposed to cause interference between them. An independent claim is included for corresponding equipment.