Willem Elenbaas

from Wikipedia, the free encyclopedia

Willem Elenbaas (born April 27, 1906 in Gapinge , Zeeland , † February 7, 1989 ) was a Dutch physicist.

Life

He attended school (HBS) in Middelburg , studied physics in Utrecht and received his doctorate on January 20, 1930 under Leonard Ornstein with the thesis "Intensiteitsmetingen in het heliumspectrum" (intensity measurement in the helium spectrum).

He started his career at Philips in Eindhoven at the Natuurkundig Laboratorium (Nat.Lab.) . At first he worked with Arend Thomas Van Urk on magnetic materials for Pupin coils until the work was taken over by Jakob Louis Snoek in 1932 .

In the lighting department, he then worked with fluorescent lamps and high-pressure mercury vapor lamps. He investigated the relationships between design parameters such as current intensity, lamp diameter, gas pressure. With the later concentration camp victim Gerhard Heller, the Elenbaas-Heller equation was created in 1935 , which describes the temperature distribution in the high-pressure mercury arc. He also developed an auxiliary electrode to help with the emission of electrons when starting when the other electrode is still too cold, and a single-coil transformer for operation on 220 and 120 volts. In 1934 the first HO lamps (H .. Hg; O .. oxide cathode) were manufactured in the test factory. The lamps were intended for street lighting and were intended to replace sodium vapor lamps. Initially, the lamps could only be operated at high temperatures and had to be operated vertically so that the glass did not melt. After they were produced from Osram glass from 1937, horizontal operation was also possible. When in 1935 Nillesen asked the cinema department for better projector lamps, he suggested water cooling to his assistant Cornelus Bol, which led to a patent dispute. In 1942 he left the laboratory.

In 1949 he was appointed managing director. In 1953 he became deputy director of the Light Group and was director from 1958 until his retirement in 1968.

A series of papers in Physika 1934–1938 established his reputation. He has written over 60 publications, including three chapters on the book of his predecessor Cornelis Zwikker , and held 50 patents. In April 1973 he was awarded the gold medal of the Illuminating Engineering Society . In 1986 Landis named the Elenbaas number after him.

Publications

  • Heat Dissipation of Parallel Plates by Free Convection ; 1942
  • The High Pressure Mercury Vapor Discharge ; 1951
  • De hogedrukkwiklamp 50 Jaar ; Philips Technisch Tijdschrift 18 (1956); Pp. 135-141

Web links

Individual references, comments

  1. ↑ named in 1939 by Robert Rompe and Paul Schulz
  2. ↑ Marc de Vries: 80 Years of Research at the Philips Natuurkundig Laboratorium (1914-1994)
  3. ↑ Dr. Willem Elenbaas ( Memento from September 27, 2006 in the Internet Archive )
  4. ↑ GVK - Common Union Catalog - 2.1
personal data
SURNAME Elenbaas, Willem
BRIEF DESCRIPTION Dutch physicist
DATE OF BIRTH April 27, 1906
PLACE OF BIRTH Gapinge , Zeeland province
DATE OF DEATH February 7, 1989