Balthasar van der Pol

Balthasar van der Pol ( Utrecht , January 27 1889 - Wassenaar , October 6 1959 ) was a Dutch physicist. Many of his publications deal mainly the propagation of radio waves, the theory of electrical circuits , in particular of vibrations and mathematical problems that relate to them.

Content

 * 1 Life and work
 * 2 Awards
 * 3 References
 * 4 External links

Life and Work
Van der Pol was born in Utrecht and studied there too experimental nature - and mathematics . He collaborated with John Ambrose Fleming and JJ Thomson in England and he was an employee of Hendrik Lorentzin Haarlem . Van der Pol received his doctorate in 1920 with honors in physics in Utrecht. Then he joined the Physics Laboratory of Philips in Eindhoven, where he remained until his retirement in 1949. In 1925-1927 he was the mentor of the Delft student Johan Numans that shortwave transmitter telephony PCJJ designed and built. This first crystal controlled transmitter in Europe would be world famous. He also became a professor in 1938 particularly in theoretical electrical engineering at the Technical University in Delft .

Together with Henk Bremmer Van der Pol in 1938 described mathematically the influence of radio frequency propagation by the curvature of the earth's surface. His study of the electromagnetic vibration phenomenaas one of the first studies in the field of non-linear systems has remained significant. Van der Pol herein discovered the phenomenon of limit cycle, which in many other nonlinear oscillators occurs. He described this in the so-called Van der Pol oscillator . In addition, Van der Pol discoverer of the white noise . Bremmer with Van der Pol has the 40 pioneering work in the field of operational calculus as the two-sided Laplace transform .

Van der Pol was one of the founders and long-time Chairman of The Netherland Radio Society (NRG), the current Dutch Electronics and Radio Society ( NERG ), and member of the International Union of Radio Diffusion and Union Radio Scientifique Internationale URSI .

Awards [ edit ]
Van der Pol received in 1935 from the American IRE (the current IEEE ) Medal of Honor "for his fundamental research and contributions to the field of the theory of circuits and the propagation of electromagnetic waves." He also received the Gold Medal Valdemar Poulsen of the Danish Technical College and received honorary doctorates from the Universities of Warsaw and Geneva .

In 1973, the 'Dutch' asteroid 1045 T-2 named in honor of Van der Pol. Delft is named a road after him in the university district, and the state-built student dormitory on the road in 1997, known as' BalPol.