Dr. Didem Ozevin Profile

Dr. Didem Ozevin

Associate Professor at Univ of Illinois at Chicago

SPIE Involvement:

Conference Program Committee | Author

Publications (26)

PROCEEDINGS ARTICLE | March 27, 2018

Real-time nondestructive monitoring of the gas tungsten arc welding (GTAW) process by combined airborne acoustic emission and non-contact ultrasonics

Proc. SPIE. 10599, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XII

KEYWORDS: Sensors, Tungsten, Nondestructive evaluation, Ultrasonics, Transducers, Acoustic emission

Read Abstract

PROCEEDINGS ARTICLE | March 27, 2018

Piezoelectric micromachined acoustic emission sensors for early stage damage detection in structures

Proc. SPIE. 10599, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XII

KEYWORDS: Microelectromechanical systems, Sensors, Silicon, Manufacturing, Transducers, Damage detection, Aluminum nitride, Acoustic emission

Read Abstract

PROCEEDINGS ARTICLE | May 8, 2017

3D printed metamaterial design to focus wave energy in thin plates

Proc. SPIE. 10169, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017

KEYWORDS: Metamaterials, Waveguides, Sensors, Signal attenuation, Composites, Wave plates, 3D printing, Wave propagation, Aluminum, Acoustic emission, Acoustics, Systems modeling

Read Abstract

PROCEEDINGS ARTICLE | April 19, 2017

The integration of periodic truss bridge design and impulse response method

Proc. SPIE. 10169, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017

KEYWORDS: Receivers, Oscilloscopes, Failure analysis, Structural engineering

Read Abstract

PROCEEDINGS ARTICLE | September 23, 2016

Integration of periodic structure and highly narrowband MEMS sensor to enhance crack detection ability in steel structures

Proc. SPIE. 9918, Metamaterials, Metadevices, and Metasystems 2016

KEYWORDS: Microelectromechanical systems, Sensors, Crystals, Wave plates, Wave propagation, Structural health monitoring, Finite element methods, Bridges, Acoustic emission, Acoustics

Read Abstract

PROCEEDINGS ARTICLE | April 8, 2016

Fatigue crack growth monitoring of idealized gearbox spline component using acoustic emission

Proc. SPIE. 9804, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016

KEYWORDS: Ferroelectric materials, Sensors, Pattern recognition, Manufacturing, Nondestructive evaluation, Ultrasonics, Data acquisition, Signal processing, Acoustic emission, Signal detection

Read Abstract

The spline component of gearbox structure is a non-redundant element that requires early detection of flaws for preventing catastrophic failures. The acoustic emission (AE) method is a direct way of detecting active flaws; however, the method suffers from the influence of background noise and location/sensor based pattern recognition method. It is important to identify the source mechanism and adapt it to different test conditions and sensors. In this paper, the fatigue crack growth of a notched and flattened gearbox spline component is monitored using the AE method in a laboratory environment. The test sample has the major details of the spline component on a flattened geometry. The AE data is continuously collected together with strain gauges strategically positions on the structure. The fatigue test characteristics are 4 Hz frequency and 0.1 as the ratio of minimum to maximum loading in tensile regime. It is observed that there are significant amount of continuous emissions released from the notch tip due to the formation of plastic deformation and slow crack growth. The frequency spectra of continuous emissions and burst emissions are compared to understand the difference of sudden crack growth and gradual crack growth. The predicted crack growth rate is compared with the AE data using the cumulative AE events at the notch tip. The source mechanism of sudden crack growth is obtained solving the inverse mathematical problem from output signal to input signal. The spline component of gearbox structure is a non-redundant element that requires early detection of flaws for preventing catastrophic failures. In this paper, the fatigue crack growth of a notched and flattened gearbox spline component is monitored using the AE method The AE data is continuously collected together with strain gauges. There are significant amount of continuous emissions released from the notch tip due to the formation of plastic deformation and slow crack growth. The source mechanism of sudden crack growth is obtained solving the inverse mathematical problem from output signal to input signal.

PROCEEDINGS ARTICLE | April 3, 2015

The design, characterization, and comparison of MEMS comb-drive acoustic emission transducers with the principles of area-change and gap-change

Proc. SPIE. 9435, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2015

KEYWORDS: Microelectromechanical systems, Sensors, Metals, Manufacturing, Numerical simulations, Wave propagation, Capacitance, Transducers, Acoustic emission, Surface micromachining

Read Abstract

PROCEEDINGS ARTICLE | April 1, 2015

Numerical and experimental demonstration of shear stress measurement at thick steel plates using acoustoelasticity

Proc. SPIE. 9437, Structural Health Monitoring and Inspection of Advanced Materials, Aerospace, and Civil Infrastructure 2015

KEYWORDS: Sensors, Nondestructive evaluation, Receivers, Wave plates, 3D modeling, Ultrasonics, Transducers, 3D metrology, Aluminum, Acoustics

Read Abstract

PROCEEDINGS ARTICLE | April 10, 2014

Studying the effect of cracks on the ultrasonic wave propagation in a two dimensional gearbox finite element model

Proc. SPIE. 9063, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2014

KEYWORDS: Teeth, Sensors, Wave plates, 3D modeling, Ultrasonics, Wave propagation, Structural health monitoring, Finite element methods, Damage detection, Algorithm development

Read Abstract

PROCEEDINGS ARTICLE | March 9, 2014

High frequency elastic wave propagation in large structures using spectral elements and perfectly matched layer

Proc. SPIE. 9063, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2014

KEYWORDS: Detection and tracking algorithms, Sensors, Metals, Pattern recognition, Wave plates, Wave propagation, Acoustic emission, Chemical elements

Read Abstract

PROCEEDINGS ARTICLE | March 8, 2014

Numerical and experimental characterizations of piezoresistive MEMS strain sensors

Proc. SPIE. 9061, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014

KEYWORDS: Microelectromechanical systems, Semiconductors, Sensors, Metals, Silicon, Manufacturing, Resistance, Aluminum, Micromachining, Acoustic emission

Read Abstract

PROCEEDINGS ARTICLE | April 19, 2013

Numerical and experimental characterizations of low frequency MEMS AE sensors

Proc. SPIE. 8692, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2013

KEYWORDS: Microelectromechanical systems, Packaging, Sensors, Signal attenuation, Metals, Nickel, Silicon, Manufacturing, Capacitance, Aluminum

Read Abstract

PROCEEDINGS ARTICLE | April 16, 2013

The selection of spectral element polynomial orders for high frequency numerical wave propagation

Proc. SPIE. 8694, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013

KEYWORDS: Matrices, Nondestructive evaluation, Numerical integration, Ultrasonics, Pollution, Numerical analysis, Wave propagation, Finite element methods, Acoustic emission, Chemical elements

Read Abstract

PROCEEDINGS ARTICLE | April 11, 2013

The influence of multi-mode failures in composites on the characteristics of elastic waves

Proc. SPIE. 8694, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013

KEYWORDS: Carbon, Data modeling, Sensors, Pattern recognition, Composites, Integrated modeling, Wave propagation, Finite element methods, Neural networks, Acoustic emission

Read Abstract

PROCEEDINGS ARTICLE | April 5, 2012

Multi-physics modeling of sensor-structure interaction for quantitative acoustic emission

Proc. SPIE. 8347, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2012

KEYWORDS: Sensors, Matrices, 3D modeling, Scanning electron microscopy, Numerical analysis, Wave propagation, Finite element methods, Acoustic emission, Chemical elements, Signal detection

Read Abstract

PROCEEDINGS ARTICLE | April 3, 2012

Numerical demonstration of MEMS strain sensor

Proc. SPIE. 8345, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012

KEYWORDS: Microelectromechanical systems, Semiconductors, Sensors, Etching, Metals, Crystals, Silicon, Manufacturing, Structural health monitoring, Temperature metrology

Read Abstract

PROCEEDINGS ARTICLE | March 30, 2011

Early state damage detection of aluminum 7075-T6 plate based on acoustic emission

Proc. SPIE. 7983, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011

KEYWORDS: Sensors, Inspection, Nondestructive evaluation, Wave plates, Data acquisition, Finite element methods, Damage detection, Aluminum, Acoustic emission, Aircraft structures

Read Abstract

PROCEEDINGS ARTICLE | April 1, 2010

Steel bridge fatigue crack detection with piezoelectric wafer active sensors

Proc. SPIE. 7647, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010

KEYWORDS: Sensors, Wave plates, Transducers, Bridges, Acoustic emission, Active remote sensing, Imaging arrays, Semiconducting wafers, Signal detection, Active sensors

Read Abstract

PROCEEDINGS ARTICLE | April 8, 2009

Piezoelectric based sensing in wireless steel bridge health monitoring

Proc. SPIE. 7294, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2009

KEYWORDS: Sensors, Inspection, Telecommunications, Damage detection, Bridges, Sensing systems, Acoustic emission, Active remote sensing, Semiconducting wafers, Signal detection

Read Abstract

PROCEEDINGS ARTICLE | April 28, 2008

Acoustic emission analysis of full-scale honeycomb sandwich composite curved fuselage panels

Proc. SPIE. 6934, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2008

KEYWORDS: Sensors, Composites, Inspection, Nondestructive evaluation, Photogrammetry, Data acquisition boards, Acoustic emission, Signal generators, Research facilities, Picture Archiving and Communication System

Read Abstract

PROCEEDINGS ARTICLE | April 28, 2008

Detecting damage in full-scale honeycomb sandwich composite curved fuselage panels through frequency response

Proc. SPIE. 6934, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2008

KEYWORDS: Sensors, Signal attenuation, Composites, Inspection, Nondestructive evaluation, Receivers, Photogrammetry, Acoustic emission, Acoustics, Failure analysis

Read Abstract

PROCEEDINGS ARTICLE | April 19, 2007

Integrated acoustic emission/vibration sensor for detecting damage in aircraft drive train components

Proc. SPIE. 6531, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2007

KEYWORDS: Detection and tracking algorithms, Sensors, Pattern recognition, Nondestructive evaluation, Interference (communication), Data acquisition, Signal processing, Acoustic emission, Acoustics, Signal detection

Read Abstract

Diaphragm-type couplings are high misalignment torque and speed transfer components used in aircrafts. Crack development in such couplings, or in the drive train in general, can lead to component failure that can bring down an aircraft. Real time detection of crack formation and growth is important to prevent such catastrophic failures. However, there is no single Nondestructive Monitoring method available that is capable of assessing the early stages of crack growth in such components. While vibration based damage identification techniques are used, they cannot detect cracks until they reach a considerable size, which makes detection of the onset of cracking extremely difficult. Acoustic Emission (AE) can detect and monitor early stage crack growth, however excessive background noise can mask acoustic emissions produced by crack initiation. Fusion of the two mentioned techniques can increase the accuracy of measurement and minimize false alarms. However, a monitoring system combining both techniques could prove too large and heavy for the already restricted space available in aircrafts. In the present work, we will present a newly developed integrated Acoustic Emission/Vibration (AE/VIB) combined sensor which can operate in the temperature range of -55°F to 257°F and in high EMI environment. This robust AE/VIB sensor has a frequency range of 5 Hz-2 kHz for the vibration component and a range of 200-400 kHz for the acoustic emission component. The sensor weight is comparable to accelerometers currently used in flying aircraft. Traditional signal processing approaches are not effective due to high signal attenuation and strong background noise conditions, commonly found in aircraft drive train systems. As an alternative, we will introduce a new Supervised Pattern Recognition (SPR) methodology that allows for simultaneous processing of the signals detected by the AE/VIB sensor and their classification in near-real time, even in these adverse conditions. Finally, we will discuss the architecture developed to produce a fully autonomous monitoring tool based on the fusion of the AE and Vibration techniques.

PROCEEDINGS ARTICLE | April 5, 2006

Structural tests using a MEMS acoustic emission sensor

Proc. SPIE. 6174, Smart Structures and Materials 2006: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

KEYWORDS: Microelectromechanical systems, Electronics, Sensors, Transducers, Bridges, Acoustic emission, Computer aided design, Signal detection, Lead, Picture Archiving and Communication System

Read Abstract

In a collaborative project at Lehigh and Carnegie Mellon, a MEMS acoustic emission sensor was designed and fabricated as a suite of six resonant-type capacitive transducers in the frequency range between 100 and 500 kHz. Characterization studies showed good comparisons between predicted and experimental electro-mechanical behavior. Acoustic emission events, simulated experimentally in steel ball impact and in pencil lead break tests, were detected and source localization was demonstrated. In this paper we describe the application of the MEMS device in structural testing, both in laboratory and in field applications. We discuss our findings regarding housing and mounting (acoustic coupling) of the MEMS device with its supporting electronics, and we then report the results of structural testing. In all tests, the MEMS transducers were used in parallel with commercial acoustic emission sensors, which thereby serve as a benchmark and permit a direct observation of MEMS device functionality. All tests involved steel structures, with particular interest in propagation of existing cracks or flaws. A series of four laboratory tests were performed on beam specimens fabricated from two segments (Grade 50 steel) with a full penetration weld (E70T-4 electrode material) at midspan. That weld region was notched, an initial fatigue crack was induced, and the specimens were then instrumented with one commercial transducer and with one MEMS device; data was recorded from five individual transducers on the MEMS device. Under a four-point bending test, the beam displayed both inelastic behavior and crack propagation, including load drops associated with crack instability. The MEMS transducers detected all instability events as well as many or most of the acoustic emissions occurring during plasticity and stable crack growth. The MEMS transducers were less sensitive than the commercial transducer, and did not detect as many events, but the normalized cumulative burst count obtained from the MEMS transducers paralleled the count obtained from the commercial transducer. Waveform analysis of signals from the MEMS transducers provided additional information concerning arrivals of P-waves and S-waves. Similarly, the analysis provided additional confirmation that the acoustic emissions emanated from the damage zone near the crack tip, and were not spurious signals or artifacts. Subsequent tests were conducted in a field application where the MEMS transducers were redundant to a group of commercial transducers. The application example is a connection plate in truss bridge construction under passage of heavy traffic loads. The MEMS transducers were found to be functional, but were less sensitive in their present form than existing commercial transducers. We conclude that the transducers are usable in their current configuration and we outline applications for which they are presently suited, and then we discuss alternate MEMS structures that would provide greater sensitivity.

PROCEEDINGS ARTICLE | May 17, 2005

Design, characterization, and experimental use of the second generation MEMS acoustic emission device

Proc. SPIE. 5765, Smart Structures and Materials 2005: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

KEYWORDS: Microelectromechanical systems, Etching, Capacitance, Transducers, Acoustic emission, Signal detection, Atmospheric sensing, Surface micromachining, Lead, Picture Archiving and Communication System

Read Abstract

We describe the design, fabrication, testing and application (in structural experiments) of our 2004 (second generation) MEMS device, designed for acoustic emission sensing based upon experiments with our 2002 (first generation) device. Both devices feature a suite of resonant-type transducers in the frequency range between 100 kHz and 1 MHz. The 2002 device was designed to operate in an evacuated housing because of high squeeze film damping, as confirmed in our earlier experiments. In additional studies involving the 2002 device, experimental simulation of acoustic emissions in a steel plate, using pencil lead break or ball impact loading, showed that the transducers in the frequency range of 100 kHz-500 kHz presented clearer output signals than the transducers with frequencies higher than 500 kHz. Using the knowledge gained from the 2002 device, we designed and fabricated our second generation device in 2004 using the multi-user polysilicon surface micromachining (MUMPs) process. The 2004 device has 7 independent capacitive type transducers, compared to 18 independent transducers in the 2002 device, including 6 piston type transducers in the frequency range of 100 kHz to 500 kHz and 1 piston type transducer at 1 MHz to capture high frequency information. Piston type transducers developed in our research have two uncoupled modes so that twofold information can be acquired from a single transducer. In addition, the piston shape helps to reduce residual stress effect of surface micromachining process. The center to center distance between etch holes in the vibrating plate was reduced from 30 μm to 13 μm, in order to reduce squeeze film damping. As a result, the Q factor under atmospheric pressure for the 100 kHz transducer was increased to 2.37 from 0.18, and therefore the vacuum housing has been eliminated from the 2004 device. Sensitivities of transducers were also increased, by enlarging transducer area, in order to capture significant small amplitude acoustic emission events. The average individual transducer area in the 2004 device was increased to 6.97 mm² as compared to 2.51 mm² in the 2002 device. In this paper, we report the new experimental results on the characterization of the 2004 device and compare them with analytical results. We show improvements in sensitivity as measured by capacitance and as measured by pencil lead break experiments. Improvement in damping is also evaluated by admittance measurement in atmosphere. Pencil lead break experiments also show that transducers can operate in atmospheric pressure. Finally, we apply the device to acoustic emission experiments on crack propagation in a steel beam specimen, precracked in fatigue, in a four-point bending test.

PROCEEDINGS ARTICLE | July 29, 2004

Resonant-type MEMS transducers excited by two acoustic emission simulation techniques

Proc. SPIE. 5391, Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

KEYWORDS: Microelectromechanical systems, Ceramics, Fourier transforms, Transducers, Signal processing, Acoustic emission, Signal detection, Time-frequency analysis, Surface micromachining, Lead

Read Abstract

PROCEEDINGS ARTICLE | August 18, 2003

Development of a MEMS device for acoustic emission testing

Proc. SPIE. 5057, Smart Structures and Materials 2003: Smart Systems and Nondestructive Evaluation for Civil Infrastructures

KEYWORDS: Microelectromechanical systems, Sensors, Amplifiers, Receivers, Ultrasonics, Scanning electron microscopy, Capacitance, Transducers, Acoustic emission, Signal detection

Read Abstract

Showing 5 of 26 publications

Conference Committee Involvement (11)

Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII

4 March 2019 | Denver, Colorado, United States

Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XII

5 March 2018 | Denver, Colorado, United States

Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XI

26 March 2017 | Portland, Oregon, United States

Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure X

21 March 2016 | Las Vegas, Nevada, United States

Structural Health Monitoring and Inspection of Advanced Materials, Aerospace, and Civil Infrastructure IX

9 March 2015 | San Diego, California, United States

Showing 5 of 11 published special sections

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years