Characterization of directivity patterns ultrasonic non-destructive testing probes

Ülker, Aydın


Characterization of cross-coupling in capacitive micromachined ultrasonic transducers
Bayram, Barış; Yaralioglu, GG; Oralkan, O; Lin, DS; Zhuang, XF; Ergun, AS; Sarioglu, AF; Wong, SH; Khuri-Yakub, BT (2005-01-01)
This paper analyzes element-to-element and cell-to-cell cross-coupling in capacitive micromachined ultrasonic transducers (cMUTs) using an interferometer. In a 1-D linear cMUT array immersed in oil, a single element was excited, and membrane displacements were measured at different positions along the array with an interferometer. Electrical measurements of the received voltage on each array element were also performed simultaneously to verify the optical measurements. The array was then covered with a poly...
Baker, Derek Keıth; Johnson, Evan Fair(2018-12-31)
The GUNAM-ODAK research group is developing Thermal Energy Storage (TES) technologies for Concentrated Solar Power systems. Focus is on solid-particle (granular) TES materials such as silica sand due to their high melting temperatures and low costs. In the proposed work, the experimental equipment needed to characterize some of the most important properties of TES materials will be constructed, with the goal of characterizing new materials and providing accurate inputs for numerical modeling. Specifically, ...
Characterization of Metamaterials using a New Design and Measurement Technique for Microstrip Circuit Applications
Nesimoglu, Tayfun; Sabah, Cumali (2014-12-14)
Characterization of a metamaterial based on an S-Shaped resonator and a feeding transmission line using a new measurement technique is studied in this paper. First, the metamaterial is designed and simulated using conventional methods. Then, it is fabricated on microstrip and excited by using a microstrip transmission feedline. Measurements were carried out using a vector network analyzer by (SubMiniature version A) SMA coaxial terminations without needing any waveguide transmission lines. For both simulate...
Characterization of GZO thin films fabricated by RF magnetron sputtering method and electrical properties of In/GZO/Si/Al diode
Surucu, O. Bayrakli (Springer Science and Business Media LLC, 2019-11-01)
The main focus of this work is the structural and optical characterization of Ga-doped ZnO (GZO) thin film and determination of the device behavior of In/GZO/Si/Al diode. GZO thin films were deposited by RF magnetron sputtering technique from single target. The structural and morphological properties of GZO film were investigated by X-ray diffraction (XRD), Raman scattering, scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy analysis (EDS) measurements. Optical properties of the fil...
Characterization of novel materials for fused filament fabrication
AL-DUAIS, ABDULLAH ABDULRAHMAN NAJI; Özerinç, Sezer; Kazanç Özerinç, Feyza; Department of Mechanical Engineering (2021-6-24)
Fused filament fabrication (FFF) is a polymer additive manufacturing technology that is suitable for a wide range of applications due to its low cost and ease of use. This thesis investigated two types of novel materials for FFF use. First, a foaming PLA filament is considered and the mechanical properties of 3D printed specimens using this filament is characterized. The results show that the strength, modulus and density of the foaming PLA can be tuned over a wide range of values by varying FFF process par...
Citation Formats
A. Ülker, “Characterization of directivity patterns ultrasonic non-destructive testing probes,” Middle East Technical University, 1995.