| 释义 |
Poulsen arc|ˈpəʊlsən ɑːk|
[Named after its inventor, Valdemar Poulsen (1869–1942), Danish electrical engineer.]
An arc discharge between a carbon electrode and a water-cooled copper electrode operated in an atmosphere of hydrogen or hydrocarbon vapour and a strong magnetic field in order to make possible the emission of waves short enough to be used for radiotelegraphy.
1906Electrician 21 Dec. 375/1 The physical..circumstances of the Poulsen arc are rather forbidding. 1916Ibid. 14 Jan. 535/2 In wireless telegraphy there has been a notable advance in the use of the Poulsen arc. 1931[see keying vbl. n. 1]. 1949W. R. Maclaurin Invention & Innovation in Radio Industry iv. 60 The patents on the Poulsen arc were held by enterprises that were competing with Marconi. |