Ernst Alexanderson

Ernst Fredrik Werner Alexanderson ( born January 25, 1878 in Uppsala, † May 14, 1975 in Schenectady, Schenectady County ) was a Swedish- American electrical engineer.

Life and career

Educated at the Technical University of Stockholm and at the Technische Hochschule in Berlin- Charlottenburg under Professor Adolf Slaby, he spent his working life in the United States of America. In 1902 he emigrated to the United States and worked for General Electric ( GE).

Alexanderson was employed briefly at General Electric, GE as an order from the Canadian-born professor and researcher Reginald Fessenden was to build a machine transmitter for long-wave transmitter, a so-called alternator, which should be 1000 times more powerful than existing ones. The core of a machine transmitter is a generator or dynamo with many poles, which is driven by a motor at high rotational speed. The Alexanderson transmitter ran to about 17 kHz.

Two years later, in 1906, Dr. Alexanderson before the finished Alexanderson alternator that was installed in Fessenden's radio station in Brant rock (Massachusetts ). On Christmas Eve Fessenden led by the first radio broadcast in which he himself played the violin and read from the Bible. The shipment was received even on ships in the Caribbean Sea.

The only one still functioning transmitter of this type is in the VLF transmitter Grimeton near Varberg (Sweden). He is a prime example of broadcasting technology from the pre-electronic time and since 2004 is on the list of World Heritage Sites by UNESCO.

On June 5, 1924 Alexanderson succeeded the first fax transmission across the Atlantic. Dr. Alexanderson was also involved in the development of television. In 1928, he developed a rotating mirror projector for two -meter television images. Alexanderson remained active into old age and worked in the 1950s as a consultant for GE and the Radio Corporation of America. He received a total of 344 patents, the last in 1973 at the age of 94 years. He's in the Vale Cemetery in Schenectady, Schenectady County buried.

In 1944 he received the IEEE Edison Medal and 1983, he was introduced into the National Inventors Hall of Fame.

Awards

  • IEEE Edison Medal, 1944
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