| 释义 |
electret|ɪˈlɛktrɪt|
[f. electricity + magnet.]
A permanently polarized piece of dielectric material, the electric counterpart of the permanent magnet.
1885Electrician 7 Aug. 230/1 Solid insulating substances may be made electrets artificially, with a greater or less amount of permanency. 1936Nature 18 July 130/1 An ‘electret’ is produced by solidifying certain types of wax, for example, carnauba wax, in a strong electric field... It is known that electrets can retain their original charge for a considerable period. 1960New Scientist 7 Apr. 884/3 An electret which tends to depolarize when exposed to light. 1968Ibid. 4 July 30/1 The advantages of using electrets in telephony are economy and performance. |