Acoustical Imaging by Electrostatic Transducers

1972 ◽  
pp. 237-249 ◽  
Author(s):  
P. Alais
Keyword(s):  
Electrostatic Transducers ◽  
Acoustical Imaging

Accurate determination of object–image distance for planar objects in acoustical imaging

1986 ◽  
Vol 79 (2) ◽  
pp. 382-385
Author(s):  
M. S. Narasimhan ◽  
M. Karthikeyan ◽  
S. Jegannathan
Keyword(s):  
Accurate Determination ◽  
Object Image ◽  
Image Distance ◽  
Acoustical Imaging

Acoustical Imaging, Volume 18

1992 ◽  
Vol 92 (1) ◽  
pp. 624-624
Author(s):  
James F. Bartram
Keyword(s):  
Acoustical Imaging

Acoustical imaging of a model of a human hand using pulsed microwave irradiation

1983 ◽  
Vol 4 (4) ◽  
pp. 397-400 ◽  
Author(s):  
Richard G. Olsen ◽  
James C. Lin
Keyword(s):  
Microwave Irradiation ◽  
Human Hand ◽  
Acoustical Imaging

Energy Shaping Control of Electrostatic Membrane Vibrations

1999 ◽  
Author(s):  
Andreas Kugi ◽  
Kurt Schlacher ◽  
Manfred Kaltenbacher ◽  
Reinhard Lerch
Keyword(s):  
Nonlinear Distortion ◽  
Supply Voltage ◽  
Mathematical Formulation ◽  
Voltage Source ◽  
Membrane Electrode ◽  
Closed Loop System ◽  
Feedback Controllers ◽  
Electrostatic Transducers ◽  
Membrane Vibrations ◽  
The Mathematical Model

Abstract A strong analytical mathematical formulation of electrostatic transducers is the necessary prerequisite for the design of feedback controllers. Based on the theory of Hamiltonian systems the mathematical model of a typical electrostatic transducer configuration with a moving membrane electrode and a rigid backplate electrode is derived. It is a well known fact that an increase in the sensitivity of the transducer often brings about also an increase in the nonlinear distortion and may occur a sticking of the membrane to the backplate electrode. In this paper, we propose a concept that gives a possible solution for these undesirable effects by using a controlled voltage source for the supply voltage of the transducer. The controller is designed by shaping the potential energy of the closed loop system. The change of the capacity of the transducer due to the motion of the membrane is considered as the sensor output.

Three-dimensional underwater acoustical imaging and processing

2002 ◽  
pp. 247-274
Author(s):  
Andrea Trucco ◽  
Maria Palmese ◽  
Andrea Fusiello ◽  
Vittorio Murino
Keyword(s):  
Three Dimensional ◽  
Acoustical Imaging

Acoustical imaging vol. 13

Ultrasonics ◽  
1985 ◽  
Vol 23 (6) ◽  
pp. 284
Author(s):  
J. Szilard
Keyword(s):  
Acoustical Imaging
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