将电介质放在电场中就会被极化。许多电介质的极化是与外电场同时存在同时消失的。也有一些电介质，受强外电场作用后其极化现象不随外电场去除而完全消失，出现极化电荷“永久”存在于电介质表面和体内的现象。这种在强外电场等因素作用下，极化并能“永久”保持极化状态的电介质，称为驻极体，又叫永电体。
驻极体传声器 [电子] electret microphone ; Electret Condenser Microphone ; electret mike
驻极体话筒 Electret condenser microphone
聚合物驻极体 [高分子] polymer electret
光驻极体 [电子] photoelectret
驻极体麦克风 ECM
驻极体电容式传声器 Electret Condenser Microphone
测量用驻极体传声器 measuring electret microphone
生物驻极体 bioelectret
驻极体电容传声器 Electret Condenser Microphone ; electret capacitor microphone
The increasement of Ca2+ levels was caused by the Ca2+ inflow from outside cell, rather than the release of calcium pool inside cell. Conclusion：The electret can induce Ca2+ outside 3T3 cell to flow into cells, thereby induce cell apoptosis.
结论：驻极体诱导3T3细胞凋亡的机制可能是细胞外Ca2+内流引起的。
参考来源 - 驻极体诱导3T3细胞内游离钙离子浓度的变化 Electrets induced free Ca2+ changes in 3T3 cellsWe establish system model, and do some relevant simulation.2、Studying micro electret’s machining technology.
2、研究微型化驻极体的制备工艺,根据驻极体材料的充电原理和热处理等对驻极体的影响,对驻极体材料进行大量实验研究,分析其表面电位大小和稳定性,获得了优化的充电条件。
参考来源 - 基于驻极体的振动式静电微型发电机研究·2,447,543篇论文数据，部分数据来源于NoteExpress
负极性驻极体能减少凋亡细胞的表面电荷量。
Surface charge density of apoptotic cell was reduced by electret.
推导了聚合物和聚合物驻极体中的跳跃电流公式。
In this paper, the formulas of hopping current in polymer and polymer electret are derived.
驻极体传声器是一种用驻极体材料制造的新型传声器。
The electret microphone is a new microphone which is made with the electret material.
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