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frank8595

木虫 (著名写手)

[交流] 求助微波法原理的翻译

A dielectric material can be processed with energy in the form of high-frequency electromagnetic waves. The principal frequencies of microwave heating are between 900 and 2 450 MHz. At lower microwave frequencies, conductive currents flowing within the material due to the movement of ionic constituents can
transfer energy from the microwave field to the material. At higher frequencies, the energy absorption is primarily due to molecules with permanent dipole, which tend to re-orientate under the influence of a microwave electric field. This re-orientation loss mechanism originates from the inability of the polarisation to follow extremely rapid reversals of the electric field, so the polarisation phasor lags the applied
electric field. This ensures that the resulting current density has a component in phase with the field, and therefore power is dissipated in the dielectric material.

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syh9288

捐助贵宾 (著名写手)

海军上将

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frank8595(金币+5,VIP+0):谢谢! 12-15 15:19
zap65535(金币+5,VIP+0):补发 12-24 19:20
一种介电材料可在以超高频电磁波形式释放能量的作用下被加工。微波加热的主要频率在900兆赫兹和2450兆赫兹之间。在较低的微波频段下,由于离子成分的运动,在材料内流动的传导性的电流能将能量从微波场转移到材料。在更高的频率下,能量吸收主要是由于永久偶极分子引起的,这种分子在微波场影响下有重定位的趋势。这种再定位损失机理是由于电场极快的逆向转换造成偏振不能发生而引起的,因此偏振量滞后于外加电场。这能确保:所产生的电流密度会有一个成分与场是同步的,因而能量在介电材料中被消耗。
人生如梦,一樽还酹江月
2楼2009-12-14 13:16:41
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