An analytical-numerical method for determining the mechanical response of a condenser microphone.
An analytical-numerical method for determining the mechanical response of a condenser microphone.
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DOI：
10.1121/1.3652853
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发表时间：
2011-12
期刊：
影响因子：
--
通讯作者：
D. Homentcovschi;R. Miles
中科院分区：
文献类型：
--
作者：
D. Homentcovschi;R. Miles
The paper is based on determining the reaction pressure on the diaphragm of a condenser microphone by integrating numerically the frequency domain Stokes system describing the velocity and the pressure in the air domain beneath the diaphragm. Afterwards, the membrane displacement can be obtained analytically or numerically. The method is general and can be applied to any geometry of the backplate holes, slits, and backchamber. As examples, the method is applied to the Bruel & Kjaer (B&K) 4134 1/2-inch microphone determining the mechanical sensitivity and the mechano-thermal noise for a domain of frequencies and also the displacement field of the membrane for two specified frequencies. These elements compare well with the measured values published in the literature. Also a new design, completely micromachined (including the backvolume) of the B&K micro-electro-mechanical systems (MEM) 1/4-inch measurement microphone is proposed. It is shown that its mechanical performances are very similar to those of the B&K MEMS measurement microphone.
