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CMUT array modeling through free acoustic CMUT modes and analysis of the fluid CMUT interface through Fourier
1Norwegian University of Science and Technology, Department of Electronics and Telecommunications, Trondheim, Norway. arne.ronnekleiv@iet.ntnu.no
Summary
A new method analyzes capacitive micromachined ultrasonic transducer (CMUT) arrays by combining isolated element analysis with fluid coupling via an impedance matrix. This approach efficiently models CMUT array performance and identifies resonance damping strategies.
Area of Science:
- Acoustics
- Microelectromechanical Systems (MEMS)
- Array Signal Processing
Background:
- Capacitive micromachined ultrasonic transducers (CMUTs) are crucial for ultrasonic applications.
- Analyzing CMUT arrays requires efficient modeling of element interactions and fluid coupling.
- Existing methods may be computationally intensive for large arrays.
Purpose of the Study:
- To develop a computationally efficient method for analyzing CMUT arrays.
- To model the acoustic behavior of CMUT arrays considering element coupling and fluid interaction.
- To investigate methods for controlling resonance in CMUT arrays.
Main Methods:
- Combines free acoustic mode description of isolated CMUTs with fluid coupling via a frequency-dependent impedance matrix.
- Separates CMUT parameters (frequency-independent) from fluid coupling parameters (frequency-dependent).
- Analyzes an infinite array of circular CMUTs on a rectangular grid operating in collapsed mode.
Main Results:
- The method provides transfer functions for various CMUT parameters (current, mode excitations, acoustic pressure).
- Sharp resonances were observed in the analyzed CMUT array.
- Resonances can be effectively damped by adding series resistors or increasing fluid viscosity.
Conclusions:
- The proposed analysis method offers potential for significant computer time savings.
- The study demonstrates the impact of fluid coupling and array configuration on CMUT performance.
- Strategies for damping undesirable resonances in CMUT arrays are identified.