In memoriam Prof. Dr.-Ing. habil. Rainer Grünwald

On May 20, 2022, after a short, serious illness, Prof. Dr.-Ing. habil. Rainer Grünwald, for many years full professor for measurement technology in mechanical engineering and production measurement technology at the Institute for Process Measurement and Sensor Technology of the Department of Mechanical Engineering at the Technische Universität Ilmenau.

Prof. Dr.-Ing. habil. Rainer Grünwald

Rainer Grünwald was born in Rumburg on December 23, 1944. After graduating from high school and a one-year internship at Carl Zeiss Jena, he studied at the Department of Precision Mechanics and Optics at TU Ilmenau. Here he then received his doctorate in 1972 for "Absolute coding of paths and angles with the aid of the Moiré effect". After obtaining the academic degree "Dr. sc. techn." in 1985 (changed to Dr.-Ing. habil. in 1991), he was appointed lecturer for production metrology/ optoelectronic sensor technology and associate professor in 1988.

From 1990 on he was head of the Group of Measurement Technology in Mechanical Engineering and Production Measurement Technology as Univ.-Prof. and founded together with Prof. Gerd Jäger the Institute for Process Measurement and Sensor Technology at the Department of Mechanical Engineering of the TU Ilmenau.

His entire and comprehensive scientific work was characterized in particular by original contributions to interference optical measurement and sensor technology up to the nanopositioning and nanomeasuring machines, with which the TU Ilmenau has a unique scientific position to this day. Driven by the special endeavor to quickly implement scientific results in industrial practice, he was one of the co-founders of SIOS Meßtechnik GmbH in 1991, which has since developed into a globally recognized producer of laser interferometric and other precision measuring devices for measuring length, angle, vibration, straightness, mass, force and other measurands.

From 1990 to 2008 he organized the Ilmenau Scientific Colloquium of the Department of Mechanical Engineering and thus made an enormous contribution to the positive development of internationality and worldwide visibility of the entire TU Ilmenau.

In his farsighted and unselfish manner, he helped lead the Institute for Process Measurement and Sensor Technology for decades and represented it internationally in an outstanding manner. As a university lecturer, he significantly enriched the education of our students with his demanding and excellent lectures and was very popular with them. Through his dedicated supervision of numerous final theses and doctoral dissertations, he has promoted many careers of today's successful engineers and scientists.

We will keep Prof. Grünwald in honorable memory as a distinguished, dedicated scientist and an open and sincere person.


Prof. Dr.-Ing. habil. Dr. h.c. mult Prof. h.c. Gerd Jäger, Prof. Dr.-Ing. habil. Eberhard Manske,

Prof. Dr.-Ing. habil. Thomas Fröhlich,

Technische Universität Ilmenau, Institute for Process Measurement and Sensor Technology