Nonlinear Static and Dynamic Behavior of an Imperfect Circular Microplate Under Electrostatic Actuation

2017 ◽  
Author(s):  
Aymen Jallouli ◽  
Najib Kacem ◽  
Joseph Lardies
Keyword(s):  
Dynamic Behavior ◽  
Nonlinear Response ◽  
Primary Resonance ◽  
Ultrasonic Transducers ◽  
Geometric Imperfection ◽  
Capacitive Micromachined Ultrasonic Transducers ◽  
Softening Behavior ◽  
Geometrical Imperfections ◽  
Nonlinear Static ◽  
Circular Microplate

In this article, we investigate the nonlinear static and dynamic behavior of a clamped circular microplate in presence of imperfections. By taking in account the von Kàrmàn nonlinearity, the geometrical imperfections lead to a significant delay in static pull-in occurrence. Numerical simulations are performed in the frequency domain to study the dynamic behavior under primary resonance. A parametric analysis is conducted with respect to actuation voltages and initial deflection in order to capture the competition between hardening and softening behavior. Interestingly, we show that a geometric imperfection can change the type of nonlinear response from softening to hardening. In practice, the imperfection can be functionalized to enhance the performances of capacitive micromachined ultrasonic transducers.

scholarly journals Encapsulation of Capacitive Micromachined Ultrasonic Transducers (CMUTs) for the Acoustic Communication between Medical Implants

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 421
Author(s):  
Jorge Oevermann ◽  
Peter Weber ◽  
Steffen H. Tretbar
Keyword(s):  
Data Security ◽  
Ultrasonic Transducers ◽  
Surrounding Tissue ◽  
Center Frequency ◽  
Medical Implants ◽  
Research Groups ◽  
Capacitive Micromachined Ultrasonic Transducers ◽  
Polyether Ether Ketone ◽  
High Bandwidth ◽  
Ether Ketone

The aim of this work was to extend conventional medical implants by the possibility of communication between them. For reasons of data security and transmitting distances, this communication should be realized using ultrasound, which is generated and detected by capacitive micromachined ultrasonic transducers (CMUTs). These offer the advantage of an inherent high bandwidth and a high integration capability. To protect the surrounding tissue, it has to be encapsulated. In contrast to previous results of other research groups dealing with the encapsulation of CMUTs, the goal here is to integrate the CMUT into the housing of a medical implant. In this work, CMUTs were designed and fabricated for a center frequency of 2 MHz in water and experimentally tested on their characteristics for operation behind layers of Polyether ether ketone (PEEK) and titanium, two typical materials for the housings of medical implants. It could be shown that with silicone as a coupling layer it is possible to operate a CMUT behind the housing of an implant. Although it changes the characteristics of the CMUT, the setup is found to be well suited for communication between two transducers over a distance of at least 8 cm.

Capacitive micromachined ultrasonic transducers: Transmission evaluation with different membrane materials and dimensions

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sudhanshu Tripathi ◽  
Rekha Agarwal ◽  
Rashmi Vashisth ◽  
Devraj Singh
Keyword(s):  
Resonant Frequency ◽  
Material Selection ◽  
Transmission Efficiency ◽  
Ultrasonic Transducers ◽  
Transduction Efficiency ◽  
Membrane Material ◽  
Structural Examination ◽  
Membrane Materials ◽  
Capacitive Micromachined Ultrasonic Transducers ◽  
Output Pressure

Abstract Capacitive micromachined ultrasonic transducers (CMUTs) are dominant in generating and receiving acoustic signals. CMUT transmission efficiency solely depends upon the membrane material utilized. This work presents the structural examination of receiving and transmitting characteristics of CMUT with divergent membrane materials, namely Silicon (Si), Silicon Nitride ( Si 3 N 4 {\mathrm{Si}_{3}}{\text{N}_{4}} ), Indium Phosphide (InP), Zinc Oxide (ZnO), and Polysilicon (Poly-Si). The analysis includes the membrane deflection, pull-in voltage, output pressure, resonant frequency and capacitance modification with variable DC voltage. It has been found that InP gives the pull-in voltage comparable to Si in the receiving mode and have more transduction efficiency in transmitting mode. Effect of dimensions of CMUT on pull-in voltage and resonant frequency are also discussed. The major contribution lies in the analytical and estimation study of CMUT for appropriate membrane material selection meant for transmission and reception in the field of pressure sensing application.

Lamb wave devices using capacitive micromachined ultrasonic transducers

2001 ◽  
Vol 78 (1) ◽  
pp. 111-113 ◽  
Author(s):  
G. G. Yaralioglu ◽  
M. H. Badi ◽  
A. S. Ergun ◽  
C. H. Cheng ◽  
B. T. Khuri-Yakub ◽  
...  
Keyword(s):  
Lamb Wave ◽  
Ultrasonic Transducers ◽  
Capacitive Micromachined Ultrasonic Transducers

Evaluation of Parylene as Protection Layer for Capacitive Micromachined Ultrasonic Transducers

2019 ◽  
Vol 11 (16) ◽  
pp. 25-33 ◽  
Author(s):  
Edgard Jeanne ◽  
Cyril Meynier ◽  
Jonathan Terry ◽  
Mathieu Roy ◽  
Les Haworth ◽  
...  
Keyword(s):  
Ultrasonic Transducers ◽  
Capacitive Micromachined Ultrasonic Transducers ◽  
Protection Layer
Sign in / Sign up

Export Citation Format

Share Document