A lumped circuit model for the radiation impedance of a 2D CMUT array element
Yükleniyor...
Dosyalar
Tarih
2005
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
IEEE
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Elements of a 2D array used for 3D acoustic imaging have dimensions smaller than half of the acoustic wavelength due to the Nyquist criteria for spatial sampling. Therefore, analyses involving circuit models for the array elements have to account for the reactive part of the radiation impedance of the array element. In this paper, we introduce a lumped circuit model for the complex radiation impedance of a 2D CMUT array element. Using the finite element method (FEM) we first show that the radiation impedance of the array element is identical to that of a plane piston transducer of comparable dimensions. Then, we show that the complex radiation impedance of the 2D array element can be represented by a simple resonant circuit placed parallel to the real radiation impedance in the Mason's equivalent circuit. The component values of the reactive lumped elements forming the resonant circuit were determined by fitting the impedance of overall equivalent circuit to the FEM results using the Nelder-Mead minimization algorithm.
Açıklama
Anahtar Kelimeler
RLC circuits, Finite element methods, Sampling methods, Acoustic transducers, Equivalent circuits, Pistons, Acoustic waves, Biomembranes, Impedance, Acoustic arrays, Radiation impedance, Nelder mead minimization algorithms, Array elements, Acoustic wavelength, Nyquist diagrams, Lumped parameter networks, Finite element method, Acoustic radiators, Acoustic impedance, Acoustic imaging, Capacitive micromachined, Ultrasonic imaging, Ultrasonic transducers
Kaynak
Proceedings - IEEE Ultrasonics Symposium
WoS Q Değeri
N/A
Scopus Q Değeri
N/A
Cilt
4
Sayı
Künye
Bozkurt, A. & Karaman, M. (2005). A lumped circuit model for the radiation impedance of a 2D CMUT array element. Paper presented at the Proceedings - IEEE Ultrasonics Symposium, 4, 1929-1932. doi:10.1109/ULTSYM.2005.1603251
