Fritz Lüdi

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Fritz Lüdi (born May 16, 1903 in Bern , † February 22, 1963 in Oetwil an der Limmat ) was a Swiss high-frequency technician .

Portrait photo of Fritz Lüdi

academic career

Lüdi attended the chemistry department of the Burgdorf technical center, Canton Bern, followed by studies in theoretical physics, chemistry and mathematics at the University of Bern . Lüdi was born there in 1929 as Dr. phil. II PhD. The title of the dissertation was wave-mechanical treatment of the problem of the free electron under the simultaneous influence of a homogeneous magnetic field and a plane electromagnetic wave ( Compton effect in the magnetic field) . His habilitation thesis, published in 1940 at the ETH Zurich , was titled On The Theory of Run-Time Oscillations , and in his inaugural lecture in 1942 he spoke about the principle of feedback in nature and technology .

Professional background

From 1930 until his death in 1963 he carried out research in the physics laboratory and in two high-frequency development departments at Brown, Boveri & Cie. (BBC).

As part of a collaboration between his employer BBC and ETH Zurich, he worked from 1936 to 1939 at their department for industrial research (AfiF) under the direction of Fritz Fischer on high-frequency technology projects. Lüdi was particularly concerned with microwave technology and in 1938 he invented a multi-slot magnetron called a Turbator (CH 215600). This Turbator was used as a transmitter tube in the directional radio system IM23, which the BBC offered from 1948 and had pulse phase modulation for 23 channels in the frequency range 1900 to 2100 MHz. An improved military version was procured by the Swiss Army under the designation RB11 and used for many years.

Lüdi received further patents in the field of generating ultra-high-frequency vibrations using time-of- flight tubes . In 1940 he contributed to the development of the klystron .

Later he investigated processes and phenomena in gas discharges and in hot cathode tubes and developed a high-performance hot cathode mutator as a converter for 600 amperes. From 1957 he dealt with plasma physics and nuclear fusion .

literature

Individual evidence

  1. ↑ Brown Boveri house newspaper, 1963_03, p. 75, obituary Dr. Fritz Lüdi.
  2. ↑ Patent CH215600 : arrangement with a magnetron tube . Published on October 16, 1941 , inventor: Fritz Lüdi. ‌
  3. ^ Fritz Lüdi: Ultra short wave generator with phase focusing (Klystron) , Helvetica Physica Acta 13, 1940, pp. 122–43
personal data
SURNAME Lüdi, Fritz
BRIEF DESCRIPTION Swiss high frequency technician
DATE OF BIRTH May 16, 1903
PLACE OF BIRTH Bern
DATE OF DEATH February 22, 1963
Place of death Oetwil on the Limmat