Prof. Andrei N. Zagrai Profile

Prof. Andrei N. Zagrai

at New Mexico Institute of Mining and Technology

SPIE Involvement:

Conference Program Committee | Author

Publications (32)

Proceedings Article | 9 May 2024 Presentation + Paper

Digital twin in the real-time ultrasonic assessment of additively manufactured PLA parts

Mariya Pozhanka, Andrei Zagrai

Proceedings Volume 12951, 129510K (2024) https://doi.org/10.1117/12.3012415

KEYWORDS: Printing, Materials properties, Ultrasonics, Additive manufacturing, Elasticity, Nozzles, Signal processing, Fused deposition modeling, Ultrasound transducers

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Proceedings Article | 9 May 2024 Presentation + Paper

Electro-mechanical impedance measurements in space environment with miniaturized hardware

Funmilola Nwokocha, David Hunter, Matthew Rue, Andrei Zagrai

Proceedings Volume 12951, 129511N (2024) https://doi.org/10.1117/12.3012170

KEYWORDS: Sensors, Radiation effects, Miniaturization, Microcontrollers, Structural health monitoring, Environmental sensing, Damage detection, Satellites, Elasticity

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Proceedings Article | 9 May 2024 Presentation + Paper

Automated real-time satellite docking monitoring using piezoelectric wafer transducers

Lukas Peterson, Isabella Wells, Andrei Zagrai, Seth Kessler, Khoi Nguyen

Proceedings Volume 12951, 1295120 (2024) https://doi.org/10.1117/12.3012010

KEYWORDS: Satellites, Sensors, Microcontrollers, Metals, Signal generators, Vibration, Semiconducting wafers, Detection and tracking algorithms, Switches, Analog to digital converters

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Average satellite lifetime in orbit has been gradually increasing since the advent of the space industry. With the increase in satellite lifespan on orbit it is becoming increasingly economically advantageous to refuel and conduct in-orbit servicing rather than launching new satellites. This presents a challenging problem of automatic docking for refueling. Traditionally, docking mechanisms have used either a physical switch, a force sensor, a torque sensor, or a combination of the three. Traditional docking verification techniques using those sensors are suboptimal for use in an orbital servicing satellite as customer’s satellite mass can vary in a wide range while docking velocity also varies. In addition, the refueling system produces a complex pattern of mechanical signals during docking, which is challenging to classify. For this reason, an SHM system with small unobtrusive piezoelectric sensors was proposed to identify and characterize satellite docking. It was decided that the passive monitoring of the docking is preferable overactive methods not to interfere with satellite dynamics and reduce power use. The mechanical waves resulted from the satellite’s docking momentum annulment, thrusters, electrical motors, and mechanical component deployment were passively monitored using an array of piezoelectric wafer sensors. Features in mechanical signals corresponding to the docking were distinguished from other mechanical events normal to satellite’s operation. An algorithm was developed that utilize features specific to docking to classify the quality of the docking engagement including potential false positives and misalignment issues. This algorithm was embedded in a real-time microprocessor which was used to capture passive ultrasonic signals and run the associated data analysis algorithm. Experiments conducted on a laboratory scale docking imitator suggested the applicability of the proposed approach and verified performance on the data acquisition and classification system on exemplary signals.

Proceedings Article | 19 April 2022 Presentation + Paper

Ultrasonic testing of metallic alloy specimens with application to additive manufacturing

Mariya Chukovenkova, Andrei Zagrai, H. Scott Halliday, Joshua Toddy, Nylana Murphy

Proceedings Volume 12048, 120480N (2022) https://doi.org/10.1117/12.2613237

KEYWORDS: Additive manufacturing, Ultrasonics, Aluminum, Transducers, Manufacturing, Solids, Printing, Nondestructive evaluation, Ultrasonography, Ultrasonic non-destructive evaluation, 3D printing

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Proceedings Article | 19 April 2022 Paper

Electro-mechanical impedance structural health monitoring as an integral component of a flight recorder for space vehicles

Funmilola Nwokocha, David Hunter, Andrei Zagrai, Dale Amon, Dillon Cvetic-Thomas, Doug Weathers, Amy Tattershall, Dane Robergs, Eli Jackson

Proceedings Volume 12048, 120480H (2022) https://doi.org/10.1117/12.2612393

KEYWORDS: Piezoelectric thin film actuators, Sensors, Structural health monitoring, Finite element methods, Mathematical modeling, Data modeling, Data communications, Semiconducting wafers, Aluminum, Algorithm development, Data storage

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Proceedings Article | 18 April 2022 Presentation

Measuring acoustic attenuation using temporal and spectral methods

Lukas Peterson, Andrei Zagrai

Proceedings Volume PC12048, PC120480X (2022) https://doi.org/10.1117/12.2610718

KEYWORDS: Signal attenuation, Ultrasonics, Sensors, Acoustics, Wave propagation, Active sensors, Structural health monitoring, Structural dynamics, Space operations, Semiconducting wafers

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Proceedings Article | 28 March 2019 Paper

Autonomous structural composites for self-powered strain sensing-enabled damage detection

Alfred Mongare, Jordan Ulibarri-Sanchez, Aaron Misla, YoungHo Park, Andrei Zagrai, Donghyeon Ryu

Proceedings Volume 10970, 1097015 (2019) https://doi.org/10.1117/12.2514360

KEYWORDS: Composites, Damage detection, Fiber reinforced polymers, Unmanned aerial vehicles, Analytical research, Directed self assembly, Zinc, Molybdenum, System identification, Sensors

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Proceedings Article | 3 April 2018 Presentation

Real-time tools and modeling for electro-mechanical impedance structural health monitoring (Conference Presentation)

Andrei Zagrai, Matthew Campisi

Proceedings Volume 10600, 106000S (2018) https://doi.org/10.1117/12.2300995

KEYWORDS: Structural health monitoring, Data modeling, Transducers, Sensors, Circuit switching, Nondestructive evaluation, Sensor performance, Actuators, Computer simulations, Device simulation

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Proceedings Article | 1 April 2016 Paper

Embedded and conventional ultrasonic sensors for monitoring acoustic emission during thermal fatigue

Blaine Trujillo, Andrei Zagrai

Proceedings Volume 9805, 98051K (2016) https://doi.org/10.1117/12.2220536

KEYWORDS: Acoustic emission, Sensors, Space operations, Aluminum, Structural health monitoring, Infrared cameras, Ultrasonics, Infrared sensors, Diagnostics, Structural design, Infrared imaging, Forward looking infrared, Cameras, Temperature metrology, Scanning probe lithography, Laser ablation

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Proceedings Article | 29 April 2014 Paper

Optical feather and foil for shape and dynamic load sensing of critical flight surfaces

Richard Black, Joannes Costa, Fereydoun Faridian, Behzad Moslehi, Mehrdad Pakmehr, Jon Schlavin, Vahid Sotoudeh, Andrei Zagrai

Proceedings Volume 9064, 90642S (2014) https://doi.org/10.1117/12.2063057

KEYWORDS: Sensors, Fiber Bragg gratings, Control systems, Fiber optics sensors, Damage detection, Sensing systems, Optical fibers, Structural health monitoring, Composites, Fiber optics

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Proceedings Article | 28 March 2014 Paper

Combined electromechanical impedance and fiber optic diagnosis of aerospace structures

Jon Schlavin, Andrei Zagrai, Rebecca Clemens, Richard Black, Joey Costa, Behzad Moslehi, Ronak Patel, Vahid Sotoudeh, Fereydoun Faridian

Proceedings Volume 9064, 90640X (2014) https://doi.org/10.1117/12.2046620

KEYWORDS: Sensors, Fiber Bragg gratings, Ferroelectric materials, Charge-coupled devices, Structural dynamics, Structural health monitoring, Transducers, Damage detection, Electromagnetic coupling, Fiber optics sensors

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Proceedings Article | 28 March 2014 Paper

Monitoring of acoustic emission activity using thin wafer piezoelectric sensors

Blaine Trujillo, Andrei Zagrai, Daniel Meisner, Sepand Momeni

Proceedings Volume 9064, 906418 (2014) https://doi.org/10.1117/12.2047979

KEYWORDS: Sensors, Acoustic emission, Semiconducting wafers, Lead, Bone, Aerospace engineering, Acoustics, Aluminum, Chemical elements, Structural health monitoring

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Proceedings Article | 17 April 2013 Paper

Structural dynamic characterization of small-scale multipurpose payloads using conventional and fiber optic sensors

Rebecca Clemens, Andrei Zagrai, Jon Schlavin, Vahid Sotoudeh, Richard Black, Joey Costa, Levy Oblea, Fereydoun Faridian, Behzad Moslehi, Justin Oliveira

Proceedings Volume 8695, 869511 (2013) https://doi.org/10.1117/12.2014404

KEYWORDS: Fiber Bragg gratings, Sensors, Acoustics, Fiber optics sensors, Structural dynamics, Fiber optics, Space operations, 3D modeling, Time-frequency analysis, Fiber optics tests

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Proceedings Article | 20 April 2012 Paper

Design, development, and assembly of sub-orbital space flight structural health monitoring experiment

William Reiser, Brandon Runnels, Chris White, Abraham Light-Marquez, Andrei Zagrai, David Siler, Stephen Marinsek, Andrew Murray, Stuart Taylor, Gyuhae Park, Charles Farrar, Richard Sansom

Proceedings Volume 8348, 83481J (2012) https://doi.org/10.1117/12.918288

KEYWORDS: Sensors, Microcontrollers, Structural health monitoring, Rockets, Adhesives, Aluminum, Power supplies, Data storage, Active sensors, Environmental sensing

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Proceedings Article | 6 April 2012 Paper

Mechanical design of a Langmuir probe for a QuadSat PnP satellite

Jordan Klepper, Andrei Zagrai, Anders Jorgensen

Proceedings Volume 8345, 83454N (2012) https://doi.org/10.1117/12.918636

KEYWORDS: Sensors, Satellites, Plasma, Mechanical engineering, Space operations, Electrodes, Epoxies, System integration, Electronics, Interfaces

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Proceedings Article | 1 April 2011 Paper

Diagnosis of space structures using embedded sensors and elastic waves

Andrew Murray, Andrei Zagrai, David Conrad

Proceedings Volume 7984, 79840N (2011) https://doi.org/10.1117/12.881108

KEYWORDS: Sensors, Wave propagation, Phase shifts, Satellites, Signal detection, Structural health monitoring, Ultrasonics, Signal processing, Damage detection, Active sensors

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Proceedings Article | 9 April 2010 Paper

Active sensing of fatigue damage using embedded ultrasonics

Walter Kruse, Andrei Zagrai, Vlasi Gigineishvili

Proceedings Volume 7650, 76501J (2010) https://doi.org/10.1117/12.847672

KEYWORDS: Sensors, Aluminum, Structural dynamics, Electromagnetic coupling, Damage detection, Resistors, Bone, Ultrasonics, Signal processing, Active remote sensing

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Proceedings Article | 9 April 2010 Paper

Magneto elastic active sensors for structural health monitoring using magneto-mechanical impedance and elastic wave propagation

Timothy Barnes, Davit Kukhalashvili, Andrei Zagrai

Proceedings Volume 7650, 76501L (2010) https://doi.org/10.1117/12.847806

KEYWORDS: Brain-machine interfaces, Sensors, Transducers, Structural health monitoring, Active sensors, Aluminum, Wave propagation, Structural dynamics, Near field, Ultrasonics

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Proceedings Article | 9 April 2010 Paper

Acousto-elastic measurements and baseline-free assessment of bolted joints using guided waves in space structures

Andrei Zagrai, Vlasi Gigineishvili, Walter Kruse, Andrew Murray, Derek Doyle, Whitney Reynolds, Brandon Arritt, Hugh Gardenier

Proceedings Volume 7650, 765017 (2010) https://doi.org/10.1117/12.847883

KEYWORDS: Sensors, Ultrasonics, Wave propagation, Satellites, Waveguides, Aluminum, Phase shifts, Wave plates, Signal detection, Analytical research

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Proceedings Article | 8 April 2009 Paper

Ultrasonic assessment of satellite structural components and joints

Andrei Zagrai, Derek Doyle, Timothy Barnes

Proceedings Volume 7295, 729508 (2009) https://doi.org/10.1117/12.816057

KEYWORDS: Satellites, Wave propagation, Sensors, Wave plates, Transducers, Structural health monitoring, Aluminum, Active sensors, Phase shifts, Signal processing

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Proceedings Article | 8 April 2009 Paper

Active sensing of fatigue damage using embedded ultrasonics

Andrei Zagrai, Walter Kruse, Vlasi Gigineishvili

Proceedings Volume 7295, 72950F (2009) https://doi.org/10.1117/12.815650

KEYWORDS: Ultrasonics, Sensors, Active remote sensing, Acoustics, Amplifiers, Structural health monitoring, Active sensors, Aluminum, Wave propagation, Semiconducting wafers

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Proceedings Article | 16 April 2008 Paper

Structural health monitoring: an enabler for responsive satellites

Brandon Arritt, Lawrence Robertson, Benjamin Henderson, Lien Ouyang, Shawn Beard, Erik Clayton, Michael Todd, Derek Doyle, Andrei Zagrai, Steven Buckley, Jeffrey Ganley, Jeffry Welsh

Proceedings Volume 6935, 693513 (2008) https://doi.org/10.1117/12.776336

KEYWORDS: Satellites, Structural health monitoring, Space operations, Data modeling, Visual process modeling, Sensors, Satellite communications, 3D displays, Defense and security, Aluminum

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Proceedings Article | 10 April 2008 Paper

Damage diagnostics of metallic structures using magneto-mechanical impedance technique

Andrei Zagrai, Hakan Çakan

Proceedings Volume 6935, 69350J (2008) https://doi.org/10.1117/12.774361

KEYWORDS: Brain-machine interfaces, Sensors, Diagnostics, Structural dynamics, Active sensors, Aluminum, Magnetic sensors, Inductance, Adhesives, Metals

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Proceedings Article | 27 March 2008 Paper

Embedded nonlinear ultrasonics for structural health monitoring of satellite joints

Andrei Zagrai, Derek Doyle, Brandon Arritt

Proceedings Volume 6935, 693505 (2008) https://doi.org/10.1117/12.775766

KEYWORDS: Sensors, Satellites, Wave propagation, Structural health monitoring, Ultrasonics, Aluminum, Modulation, Active sensors, Diagnostics, Oscilloscopes

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Proceedings Article | 11 April 2007 Paper

Electro-mechanical analogies for modeling the structural impedance response

Andrei Zagrai

Proceedings Volume 6532, 65320F (2007) https://doi.org/10.1117/12.715948

KEYWORDS: Sensors, Systems modeling, Circuit switching, Aluminum, Active sensors, Commercial off the shelf technology, Oscillators, Chemical elements, Structural health monitoring, Structural dynamics

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Proceedings Article | 17 May 2006 Paper

High frequency modulation approach for the nonlinear seismo-acoustic detection of buried landmines

Dimitri Donskoy, Andrei Zagrai, Doug Fenneman, Mikhail Tsionskiy, Nikolay Sedunov

Proceedings Volume 6217, 62170X (2006) https://doi.org/10.1117/12.666457

KEYWORDS: Mining, Land mines, Acoustics, Nonlinear response, Modulation, Dynamical systems, Complex systems, Laser Doppler velocimetry, Frequency modulation, Sensors

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Proceedings Article | 4 April 2006 Paper

Micro/meso scale fatigue damage accumulation monitoring using nonlinear acoustic vibro-modulation measurements

Andrei Zagrai, Dimitri Donskoy, Alexander Chudnovsky, Edward Golovin, Vinod Agarwala

Proceedings Volume 6175, 617506 (2006) https://doi.org/10.1117/12.658558

KEYWORDS: Acoustics, Aluminum, Scanning electron microscopy, Ultrasonics, Modulation, Nondestructive evaluation, Transducers, Failure analysis, Statistical analysis, Structural health monitoring

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Proceedings Article | 21 September 2004 Paper

Resonance vibrations of buried landmines

Andrei Zagrai, Dimitri Donskoy, Alexander Ekimov

Proceedings Volume 5415, (2004) https://doi.org/10.1117/12.540670

KEYWORDS: Mining, Land mines, Soil science, Laser Doppler velocimetry, Solids, Acoustics, Mirrors, Oscillators, Velocity measurements, 3D metrology

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Proceedings Article | 18 August 2003 Paper

N-SCAN: new vibromodulation system for detection and monitoring of cracks and other contact-type defects

Dmitri Donskoy, Alexander Ekimov, Emile Luzzato, Jean-Louis Lottiaux, Stanislav Stoupin, Andrei Zagrai

Proceedings Volume 5057, (2003) https://doi.org/10.1117/12.484635

KEYWORDS: Modulation, Ultrasonics, Nondestructive evaluation, Transducers, Interfaces, Inspection, Nonlinear response, Acoustics, Nonlinear optics, Transmitters

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In recent years, innovative vibro-modulation technique has been introduced for detection of contact-type interfaces such as cracks, debondings, and delaminations. The technique utilizes the effect of nonlinear interaction of ultrasound and vibrations at the interface of the defect. Vibration varies on the contact area of the interface modulating passing through ultrasonic wave. The modulation manifests itself as additional side-band spectral components with the combination frequencies in the spectrum of the received signal. The presence of these components allows for detection and differentiation of the contact-type defects from other structural and material inhomogeneities. Vibro-modulation technique has been implemented in N-SCAN damage detection system. The system consists of a digital synthesizer, high and low frequency amplifiers, a magnetostrictive shaker, ultrasonic transducers and a PC-based data acquisition/processing station with N-SCAN software. The ability of the system to detect contact-type defects was experimentally verified using specimens of simple and complex geometries made of steel, aluminum, composites and other structural materials. N-SCAN proved to be very effective for nondestructive testing of full-scale structures ranging from 24 foot-long gun barrels to stainless steel pipes used in nuclear power plants. Among advantages of the system are applicability for the wide range of structural materials and for structures with complex geometries, real time data processing, convenient interface for system operation, simplicity of interpretation of results, no need for sensor scanning along structure, onsite inspection of large structures at a fraction of time as compared with conventional techniques. This paper describes the basic principles of nonlinear vibro-modulation NDE technique, some theoretical background for nonlinear interaction and justification of signal processing algorithm. It is also presents examples of practical implementation and application of the technique.

Proceedings Article | 11 June 2002 Paper

Health monitoring of aging aerospace structures using the electromechanical impedance method

Andrei Zagrai, Victor Giurgiutiu

Proceedings Volume 4702, (2002) https://doi.org/10.1117/12.469888

KEYWORDS: Sensors, Near field, Ferroelectric materials, Active sensors, Charge-coupled devices, Aerospace engineering, Structural dynamics, Structural health monitoring, Feature extraction, Neural networks

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Proceedings Article | 24 July 2001 Paper

Electro-mechanical impedance method for crack detection in metallic plates

Victor Giurgiutiu, Andrei Zagrai

Proceedings Volume 4335, (2001) https://doi.org/10.1117/12.434167

KEYWORDS: Sensors, Ferroelectric materials, Active sensors, Semiconducting wafers, Aluminum, Nondestructive evaluation, Structural dynamics, Bessel functions, Modal analysis, Actuators

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Proceedings Article | 22 June 2000 Paper

Use of smart materials technologies in radiation environments and nuclear industry

Victor Giurgiutiu, Andrei Zagrai

Proceedings Volume 3985, (2000) https://doi.org/10.1117/12.388812

KEYWORDS: Shape memory alloys, Smart materials, Sensors, Fiber optics, Ferroelectric materials, Optical fibers, Fiber optics sensors, Resonators, Signal attenuation, Resistance

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Showing 5 of 32 publications

Conference Committee Involvement (18)

Health Monitoring of Structural and Biological Systems XIX

17 March 2025 | Vancouver, Canada

Health Monitoring of Structural and Biological Systems XVIII

25 March 2024 | Long Beach, California, United States

Health Monitoring of Structural and Biological Systems XVII

13 March 2023 | Long Beach, California, United States

Health Monitoring of Structural and Biological Systems XVI

7 March 2022 | Long Beach, California, United States

Health Monitoring of Structural and Biological Systems XV

8 March 2021 | Online Only, California, United States

Health Monitoring of Structural and Biological Systems XIV

27 April 2020 | Online Only, California, United States

Health Monitoring of Structural and Biological Systems XIII

4 March 2019 | Denver, Colorado, United States

Health Monitoring of Structural and Biological Systems XII

5 March 2018 | Denver, Colorado, United States

Health Monitoring of Structural and Biological Systems XI

26 March 2017 | Portland, Oregon, United States

Health Monitoring of Structural and Biological Systems X

21 March 2016 | Las Vegas, Nevada, United States

Health Monitoring of Structural and Biological Systems IX

9 March 2015 | San Diego, California, United States

Health Monitoring of Structural and Biological Systems VIII

10 March 2014 | San Diego, California, United States

Health Monitoring of Structural and Biological Systems VII

11 March 2013 | San Diego, California, United States

Health Monitoring of Structural and Biological Systems VI

12 March 2012 | San Diego, California, United States

Health Monitoring of Structural and Biological Systems V

7 March 2011 | San Diego, California, United States

Health Monitoring of Structural and Biological Systems IV

8 March 2010 | San Diego, California, United States

Health Monitoring of Structural and Biological Systems III

9 March 2009 | San Diego, California, United States

Health Monitoring of Structural and Biological Systems II

10 March 2008 | San Diego, California, United States

Showing 5 of 18 Conference Committees

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