Areas of Expertise (3)
Reliability and failure of micro/nanoscale systems
X-ray tomography and applications
University of Connecticut: Ph.D., Mechanical Engineering 2013
University of Connecticut: M.S., Mechanical Engineering 2011
Media Appearances (3)
3-D Printers Bring Historic Instruments Back To The Future
But not at all the way Adolphe Sax — the man who invented and literally put the sax in the saxophone — heard the horn. The problem is that there are only about ten or so surviving original mouthpieces crafted by Sax. Howe wondered if the CT scan and X-ray data of these originals might help replicate new ones. Then he met Sina Shahbazmohamadi, director of imaging at UConn's Center for Clean Energy Engineering, now an associate professor of mechanical engineering at Manhattan College in the Bronx.
"I thought, Why not transfer the data from the X-ray to the 3-D printer and copy those?" Shahbazmohamadi says. "There are several advantages to this, mainly that there would be no error during this transferring."
High-tech 3D printing creates parts for antique musical instruments
Howe, who is also a doctoral student in music theory and history at UConn, last year brought his idea to music theory professor Richard Bass, who contacted Sina Shahbazmohamadi, an engineer and the school's director for advanced 3D imaging...
How researchers are resurrecting antique musical instruments
Shahbazmohamadi developed a new method for using micro-computed tomography to examine antique wind instruments and their parts made of wood, metal, brass, leather, and other materials.
Methods and systems for non-destructive analysis of objects and production of replica objects
US 9818383 B2
In one aspect, the present disclosure provides a method including rotating a rotatable surface with an object positioned thereon to a plurality of angular positions. The method also includes capturing, via an x-ray microtomography device at each of the plurality of angular positions, a tomograph of the object. The method also includes summing each tomograph of the object to create a three-dimensional image of the object. The method also includes using an additive manufacturing machine to create a three-dimensional replica of the object using the three-dimensional image of the object.
Rechargeable aluminum batteries (Al batteries) can potentially be safer, cheaper, and deliver higher energy densities than those of commercial Li-ion batteries (LIBs). However, due to the very high charge density of Al3+ cations and their strong interactions with the host lattice, very few cathode materials are known to be able to reversibly intercalate these ions. Herein, a rechargeable Al battery based on a two-dimensional (2D) vanadium carbide (V2CTx) MXene cathode is reported. The reversible intercalation of Al3+ cations between the MXene layers is suggested to be the mechanism for charge storage. It was found that the electrochemical performance could be significantly improved by converting multilayered V2CTx particles to few-layer sheets. With specific capacities of more than 300 mAh g–1 at high discharge rates and relatively high discharge potentials, V2CTx MXene electrodes show one of the best performances among the reported cathode materials for Al batteries. This study can lead to foundations for the development of high-capacity and high energy density rechargeable Al batteries by showcasing the potential of a large family of intercalation-type cathode materials based on MXenes.
The biodistribution and clearance of magnetoelectric nanoparticles (MENs) in a mouse model was studied through electron energy dispersive spectroscopy.
In this paper, a comprehensive set of techniques for quality control and authentication of packaged integrated circuits (IC) using terahertz (THz) time-domain spectroscopy (TDS) is developed. By material characterization, the presence of unexpected materials in counterfeit components is revealed. Blacktopping layers are detected using THz time-of-flight tomography, and thickness of hidden layers is measured. Sanded and contaminated components are detected by THz reflection-mode imaging. Differences between inside structures of counterfeit and authentic components are revealed through developing THz transmission imaging. For enabling accurate measurement of features by THz transmission imaging, a novel resolution enhancement technique (RET) has been developed. This RET is based on deconvolution of the THz image and the THz point spread function (PSF). The THz PSF is mathematically modeled through incorporating the spectrum of the THz imaging system, the axis of propagation of the beam, and the intensity extinction coefficient of the object into a Gaussian beam distribution. As a result of implementing this RET, the accuracy of the measurements on THz images has been improved from 2.4 mm to 0.1 mm and bond wires as small as 550 µm inside the packaging of the ICs are imaged.
This project used Micro-Computed Tomography (µCT) to study the anatomy of antique wind instruments and their ephemeral parts. The method permits measuring without applying physical tools to the specimen, with a precision of 1/1000mm, thereby reducing error. We used data files to perform Additive Manufacture (AM) of ophicleide and saxophone mouthpieces and joints of a historic recorder; the foot-joint of the recorder was replicated with greater fidelity to the original than by standard artisanal methods. Novel details of the construction of a Charles Sax ophicleide mouthpiece, of an Adolphe Sax saxophone mouthpiece, and of two Triébert curved cors anglais were revealed for the first time. µCT with AM offers significant insights into the construction of woodwind instruments, permitting us to replicate mouthpieces and small woodwind joints. Of interest is our ability to scale µCT data to create species of mouthpiece that no longer exist; this method will be applied to complete instruments. We anticipate producing large numbers of identical objects with these processes shortly, the limiting factor being the data transfer and modification of the prototypes. Further studies involving these methods and others such as computer-numerical controlled (CNC) milling will expand our ability to understand the construction and acoustics of early wind instruments, to study larger specimens and to replicate them by µCT, AM and CNC without the need to take physical measurements or expose specimens to harm.
Creation of three-dimensional representations of surfaces from images taken at two or more view angles is a well-established technique applied to optical images and is frequently used in combination with scanning electron microscopy (SEM). The present work describes specific steps taken to optimize and enhance the repeatability of three-dimensional surfaces reconstructed from SEM images. The presented steps result in an approximately tenfold improvement in the repeatability of the surface reconstruction compared to more standard techniques. The enhanced techniques presented can be used with any SEM friendly samples. In this work the modified technique was developed in order to accurately quantify surface geometry changes in metallic bond coats used with thermal barrier coatings (TBCs) to provide improved turbine hot part durability. Bond coat surfaces are quite rough, and accurate determination of surface geometry change (rumpling) requires excellent repeatability. Rumpling is an important contributor to TBC failure, and accurate quantification of rumpling is important to better understanding of the failure behavior of TBCs.