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Analytical Characterisation of Piezoresistive Square Diaphragm Silicon Microphone

Edvard Kälvesten (Institutionen för signaler och system) ; Lennart Löfdahl (Institutionen för termo- och fluiddynamik) ; Göran Stemme (Institutionen för tillämpad elektronik)
Sensors and Materials Vol. 8 (1996), p. 113-136.
[Artikel, refereegranskad vetenskaplig]

An analytical energy method has been used to derive the characteristics of a square-diaphragm piezoresistive silicon microphone. All relevant mechanical and acoustical effects of the sensor characteristics are included in the method. First, the energy contributions are calculated and then identified with equivalent acoustical impedances. These equivalent impedances are used in the electrical analogy. The method is applied to a piezoresistive microphone having a square diaphragm over its cavity. A special vent channel which equalizes the static air pressure between the cavity and the ambient has been included in the model. Good agreement between the theoretical analysis and experimental data on fabricated microphones was obtained.



Denna post skapades 2010-08-25.
CPL Pubid: 125128

 

Institutioner (Chalmers)

Institutionen för signaler och system
Institutionen för termo- och fluiddynamik (1989-2004)
Institutionen för tillämpad elektronik (1900-2003)

Ämnesområden

Strömningsmekanik

Chalmers infrastruktur