Dr. Andrei N. Zagrai Profile

Dr. Andrei N. Zagrai

at New Mexico Institute of Mining and Technology

SPIE Involvement:

Conference Program Committee | Author

Publications (25)

PROCEEDINGS ARTICLE | April 3, 2018

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

Proc. SPIE. 10600, Health Monitoring of Structural and Biological Systems XII

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

Read Abstract

PROCEEDINGS ARTICLE | April 1, 2016

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

Proc. SPIE. 9805, Health Monitoring of Structural and Biological Systems 2016

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

Read Abstract

PROCEEDINGS ARTICLE | April 29, 2014

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

Proc. SPIE. 9064, Health Monitoring of Structural and Biological Systems 2014

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

Read Abstract

PROCEEDINGS ARTICLE | March 28, 2014

Monitoring of acoustic emission activity using thin wafer piezoelectric sensors

Proc. SPIE. 9064, Health Monitoring of Structural and Biological Systems 2014

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

Read Abstract

PROCEEDINGS ARTICLE | March 28, 2014

Combined electromechanical impedance and fiber optic diagnosis of aerospace structures

Proc. SPIE. 9064, Health Monitoring of Structural and Biological Systems 2014

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

Read Abstract

PROCEEDINGS ARTICLE | April 17, 2013

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

Proc. SPIE. 8695, Health Monitoring of Structural and Biological Systems 2013

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

Read Abstract

PROCEEDINGS ARTICLE | April 20, 2012

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

Proc. SPIE. 8348, Health Monitoring of Structural and Biological Systems 2012

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

Read Abstract

PROCEEDINGS ARTICLE | April 6, 2012

Mechanical design of a Langmuir probe for a QuadSat PnP satellite

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

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

Read Abstract

PROCEEDINGS ARTICLE | April 1, 2011

Diagnosis of space structures using embedded sensors and elastic waves

Proc. SPIE. 7984, Health Monitoring of Structural and Biological Systems 2011

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

Read Abstract

PROCEEDINGS ARTICLE | April 9, 2010

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

Proc. SPIE. 7650, Health Monitoring of Structural and Biological Systems 2010

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

Read Abstract

PROCEEDINGS ARTICLE | April 9, 2010

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

Proc. SPIE. 7650, Health Monitoring of Structural and Biological Systems 2010

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

Read Abstract

PROCEEDINGS ARTICLE | April 9, 2010

Active sensing of fatigue damage using embedded ultrasonics

Proc. SPIE. 7650, Health Monitoring of Structural and Biological Systems 2010

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

Read Abstract

PROCEEDINGS ARTICLE | April 8, 2009

Ultrasonic assessment of satellite structural components and joints

Proc. SPIE. 7295, Health Monitoring of Structural and Biological Systems 2009

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

Read Abstract

PROCEEDINGS ARTICLE | April 8, 2009

Active sensing of fatigue damage using embedded ultrasonics

Proc. SPIE. 7295, Health Monitoring of Structural and Biological Systems 2009

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

Read Abstract

PROCEEDINGS ARTICLE | April 16, 2008

Structural health monitoring: an enabler for responsive satellites

Proc. SPIE. 6935, Health Monitoring of Structural and Biological Systems 2008

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

Read Abstract

PROCEEDINGS ARTICLE | April 10, 2008

Damage diagnostics of metallic structures using magneto-mechanical impedance technique

Proc. SPIE. 6935, Health Monitoring of Structural and Biological Systems 2008

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

Read Abstract

PROCEEDINGS ARTICLE | March 27, 2008

Embedded nonlinear ultrasonics for structural health monitoring of satellite joints

Proc. SPIE. 6935, Health Monitoring of Structural and Biological Systems 2008

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

Read Abstract

PROCEEDINGS ARTICLE | April 11, 2007

Electro-mechanical analogies for modeling the structural impedance response

Proc. SPIE. 6532, Health Monitoring of Structural and Biological Systems 2007

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

Read Abstract

PROCEEDINGS ARTICLE | May 17, 2006

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

Proc. SPIE. 6217, Detection and Remediation Technologies for Mines and Minelike Targets XI

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

Read Abstract

PROCEEDINGS ARTICLE | April 4, 2006

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

Proc. SPIE. 6175, Testing, Reliability, and Application of Micro- and Nano-Material Systems IV

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

Read Abstract

PROCEEDINGS ARTICLE | September 21, 2004

Resonance vibrations of buried landmines

Proc. SPIE. 5415, Detection and Remediation Technologies for Mines and Minelike Targets IX

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

Read Abstract

PROCEEDINGS ARTICLE | August 18, 2003

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

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

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

Read Abstract

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 | June 11, 2002

Health monitoring of aging aerospace structures using the electromechanical impedance method

Proc. SPIE. 4702, Smart Nondestructive Evaluation for Health Monitoring of Structural and Biological Systems

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

Read Abstract

PROCEEDINGS ARTICLE | July 24, 2001

Electro-mechanical impedance method for crack detection in metallic plates

Proc. SPIE. 4335, Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring

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

Read Abstract

PROCEEDINGS ARTICLE | June 22, 2000

Use of smart materials technologies in radiation environments and nuclear industry

Proc. SPIE. 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems

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

Read Abstract