Wilhelm Cauer

Wilhelm Cauer (* June 24, 1900 in Charlottenburg, † April 22, 1945 in Berlin- Marie Felde ); was a German mathematician and physicist and founder of the linear network synthesis ( circuit synthesis).

Life

Wilhelm Cauer was born the sixth child of William and Marie Cauer. His father worked at the TH Berlin as Professor of Railway Engineering. He studied from 1919 at the TH Berlin electrical engineering. After his preliminary examination, he studied at the universities of Bonn and Berlin, mathematics and physics and received his diploma studies at the TH Berlin from specialist of Technical Physics. His 1926 also created at the TH Berlin PhD research (with Prof. Georg Hamel ) on " The realization of AC resistors prescribed frequency dependence " was a landmark for his later life.

He then completed his habilitation in the subject of Applied Mathematics at the University of Göttingen. A grant from the Rockefeller Foundation had him in 1930/31 for two semesters at the Massachusetts Institute of Technology (MIT) and enables at Harvard University in Cambridge, where he was able to complete the panel work " filter circuits ". After the transfer of power Cauer signed the confession of professors at German universities and colleges to Adolf Hitler and the Nazi state, a call to vote 11 November 1933.

1935 went Cauer as a structural engineer at the Fieseler aircraft factory in Kassel. During this time he was appointed adjunct professor. In 1936 he became chief of laboratory of Mix & Genest in Berlin. At the TH Berlin he held in a special college lectures on his area. His life's work, the " theory of linear AC circuits ," appeared in 1941 in Leipzig. He remained during the 2nd World War in Berlin, where he continued his scientific work under the circumstances. Wilhelm Cauer was shot on April 22, 1945 in his garden in Berlin- Marie Felde of Soviet soldiers hostage.

The scientific estate appeared in the Akademie-Verlag Berlin ( " theory of linear AC circuits ", Vol 1, 1954 in second supplemented edition edited by Wilhelm Klein and Franz M. fur; . Vol. 2, 1960 eds. Ernst Glowatzki. ).

Scientific work

Cauer had significantly with the mathematical apparatus of the linear network theory, and the theory of the Mehrpoltheorie named after him Cauer filter. He dealt with the fundamental solvability of technical tasks, the equivalence of circuits and the interpolation. From his work grew a systematic theory for the synthesis of linear networks ( circuit synthesis). In addition to significant work on electrical filter circuits, he contributed to the development of a computing machine for the solution of equations with ten unknowns. The elliptic filter, which goes back to this work, was named after him. Even during his lifetime Cauer was recognized after only a few years of his work in the world and found in the scientific world are highly regarded. He made ​​a significant contribution to the development of systems theory and is one of the pioneers of cybernetics.

Works

• W. Cauer: filter circuits. VDI -Verlag, Berlin, 1931.
• W. Cauer: theory of linear alternating current circuits. Vol 1 Becker and Erler, Leipzig, 1941 Vol 2 Academy, Berlin, 1960