Characterization of Nanoscale Ultrasonic Transducer Elements as Effective Acoustical Devices

2016 ◽  
Vol 860 ◽  
pp. 35-40 ◽  
Author(s):  
Reshmi Maity ◽  
Niladri Pratap Maity ◽  
R.K. Thapa ◽  
S. Baishya
Keyword(s):  
Ultrasonic Transducer ◽  
Ultrasonic Transducers ◽  
Electrode Spacing ◽  
Capacitive Micromachined Ultrasonic Transducers ◽  
Non Destructive Evaluation ◽  
Electrostatic Transducers ◽  
Gap Spacing ◽  
Non Destructive ◽  
Half Decade

The generation and detection of ultrasound in air has many applications in the field of ranging, non-destructive evaluation, microscopy and the most impactful in medical imaging. Conventional designs of electrostatic transducers have large electrode spacing of 50-100 μm which reduces the sensitivity of these capacitors. In the last one and a half decade silicon micromachining is used to define capacitors with gap spacing as small as 500Å, making it possible highly efficient capacitive micromachined ultrasonic transducers (CMUTs). In this paper a CMUT element is analytically characterized and FEM simulated. The observations are compared with published experimental results and excellent agreement is found between them.

scholarly journals Advances in Capacitive Micromachined Ultrasonic Transducers

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 152 ◽  
Author(s):  
Kevin Brenner ◽  
Arif Ergun ◽  
Kamyar Firouzi ◽  
Morten Rasmussen ◽  
Quintin Stedman ◽  
...  
Keyword(s):  
Review Paper ◽  
Rapid Development ◽  
Ultrasonic Transducer ◽  
Ultrasonic Transducers ◽  
Imaging Systems ◽  
Future Trends ◽  
Levels Of Abstraction ◽  
Commercial Success ◽  
Capacitive Micromachined Ultrasonic Transducers ◽  
Capacitive Micromachined Ultrasonic Transducer

Capacitive micromachined ultrasonic transducer (CMUT) technology has enjoyed rapid development in the last decade. Advancements both in fabrication and integration, coupled with improved modelling, has enabled CMUTs to make their way into mainstream ultrasound imaging systems and find commercial success. In this review paper, we touch upon recent advancements in CMUT technology at all levels of abstraction; modeling, fabrication, integration, and applications. Regarding applications, we discuss future trends for CMUTs and their impact within the broad field of biomedical imaging.

Non-Destructive Characterization of Semiconductors Using Organic Thin Films

1985 ◽  
Vol 54 ◽  
Author(s):  
Stephen R. Forrest ◽  
Martin L. Kaplan ◽  
Paul H. Schmidt
Keyword(s):  
Thin Films ◽  
Organic Thin Films ◽  
Metal Contact ◽  
Organic Layer ◽  
Vacuum Deposition ◽  
Non Destructive Evaluation ◽  
Non Destructive ◽  
Non Destructive Characterization ◽  
Related Compounds

ABSTRACTRectifying junctions prepared by vacuum deposition of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) and related compounds on both p- and n-type inorganic semiconducting wafers are used for their non-destructive evaluation. By evaporation of metal contact pads onto the organic layer, we can probe many of the fundamental -bulk and surface properties of the semiconductor.

X-Ray Computed Tomography: A Potentially Destructive “Non-Destructive Evaluation” Technique

2019 ◽  
Author(s):  
Ryan Ross ◽  
Gil Garteiz ◽  
Stephanie Zajac
Keyword(s):  
Computed Tomography ◽  
Evaluation Technique ◽  
Total Ionizing Dose ◽  
X Ray ◽  
Non Destructive Evaluation ◽  
X Ray Computed ◽  
Flight Hardware ◽  
Non Destructive

Abstract Characterization of Computed Tomography X-Ray ionizing dose will be presented along with a methodology to protect space bound flight hardware from exceeding total ionizing dose (TID) budget prior to mission completion.

scholarly journals Mathematical modelling of ultrasonic non-destructive evaluation

2001 ◽  
Vol 5 (3) ◽  
pp. 165-180 ◽  
Author(s):  
Larissa Ju Fradkin ◽  
Victor Zalipaev ◽  
Dmitri Gridin
Keyword(s):  
Mathematical Modelling ◽  
High Frequency ◽  
Pulse Propagation ◽  
Nuclear Reactors ◽  
Near Field ◽  
Ultrasonic Transducers ◽  
Non Destructive Evaluation ◽  
Non Destructive

High-frequency asymptotics have been used at our Centre to develop codes for modelling pulse propagation and scattering in the near-field of the ultrasonic transducers used in NDE (Non-Destructive Evaluation), particularly of walls of nuclear reactors. The codes are hundreds of times faster than the direct numerical codes but no less accurate.

scholarly journals Characterization of Weldments Defects through Non Destructive Evaluation Techniques

2017 ◽  
Vol 10 (16) ◽  
pp. 1-9
Author(s):  
S. V. Ranganayakulu ◽  
Samrat Goud Burra ◽  
Sanathana Ravi ◽  
◽  
◽  
...  
Keyword(s):  
Non Destructive Evaluation ◽  
Non Destructive ◽  
Evaluation Techniques

Membrane Displacement Behavior of Capacitive Micromachined Ultrasonic Transducers under Static Bias

2013 ◽  
Vol 816-817 ◽  
pp. 892-896 ◽  
Author(s):  
Reshmi Maity ◽  
R.K. Thapa ◽  
S. Baishya
Keyword(s):  
Single Cell ◽  
Ultrasonic Transducer ◽  
Ultrasonic Transducers ◽  
Critical Parameters ◽  
Capacitive Micromachined Ultrasonic Transducers ◽  
Suspended Membrane ◽  
Displacement Behavior ◽  
Tension Analysis ◽  
Membrane Deflection ◽  
Membrane Displacement

The present paper focuses on the theory of vibration of a circular micro-machined ultrasonic transducer to model a single cell of Capacitive Micromachined Ultrasonic Transducers (CMUTs) and it describes the displacement behavior of membrane with respect to applied static bias following Masons analysis of a suspended membrane under tension. Analysis of the critical parameters like collapse voltage and membrane deflection is made and compared with experimental results to verify the validity of the model.

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