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在一般驻极体电容传声器中,它的运动部分(驻极体或电极)与后极板间有一层空气隙。因而,若工作在太大的静压力下,或被检测的信号振幅太大时,就会引起传声器灵敏度改变、输出信号产生非线性失真、甚至损坏传声器。为此,Sessler及West提出了多点支撑膜片的技术,这种技术使传声器能在相当高的声压下工作。对于静压力问题,有人在传声器上开小孔以均衡腔内外压力,但是当传声器工作在电离的及有腐蚀性的气体中,以及在液体中,这种结构不再适用。
In a typical electret condenser microphone, there is an air gap between its moving part (electret or electrode) and the rear plate. Thus, operating too much static pressure or the detected signal amplitude is too large can cause changes in microphone sensitivity, nonlinear distortion of the output signal, or even damage to the microphone. To this end, Sessler and West have proposed a technique for supporting the diaphragm more, which enables the microphone to work at a relatively high sound pressure. For static pressure problems, one person opens a hole in the microphone to equalize the pressure inside and outside the cavity, but this structure no longer works when the microphone is operated in ionized and corrosive gases and in liquids.