Simplified laser Doppler distance sensor employing a single fan-shaped interference fringe system for dynamic position and shape measurement of laterally moving objects

摘要

We introduce a simplified laser Doppler distance sensor comprising only one single fan-shaped interference fringe system for dynamic position and shape measurement of fast moving objects with micrometer precision. Due to its low complexity, it can be built very compact and cheap, which is crucial for many industrial applications. It will be shown theoretically as well as experimentally that its position uncertainty is in principle independent of the object velocity in contrast to conventional distance sensors. In order to evidence its capability, radial and axial shape measurements of rotating bodies are presented employing a miniaturized sensor setup. An average position resolution of 2.3 urn was obtained.