Education

Research Description

Dr. Peters is interested in structural health monitoring, optical fiber sensors, and composite materials. Currently, she is designing and integrating optical sensors into composites (woven, laminates, sandwich structures, and joints) and is studying self-healing composite sandwich structures.

Publications

Announcing the 2017 Measurement Science and Technology Outstanding Paper Awards

Peters, Kara and Jakoby, Bernhard and Myers, John and Yang, Wuqiang and Foss, John and Fansler, Todd and Yacoot, Andrew (2018), MEASUREMENT SCIENCE AND TECHNOLOGY, 29(9), .

Design and demonstration of a seabird-inspired fixed-wing hybrid UAV-UUV system

Stewart, William and Weisler, Warren and MacLeod, Marc and Powers, Thomas and Defreitas, Aaron and Gritter, Richard and Anderson, Mark and Peters, Kara and Gopalarathnam, Ashok and Bryant, Matthew (2018), BIOINSPIRATION & BIOMIMETICS, 13(5), .

Experimental study on directionality of ultrasonic wave coupling using surface-bonded fiber Bragg grating sensors

Wee, J. and Hackney, D. and Bradford, P. and Peters, K. (2018), Journal of Lightwave Technology, 36(4), 932-938.

The effect of short range order on the thermal output and gage factor of Ni3FeCr strain gages

Kieffer, T. P. and Peters, K. J. (2018), Strain, 54(1), .

The effects of accelerated Freeze-Thaw conditioning on CFRP strengthened concrete with pre-existing bond defects

Mabry, N. J. and Seracino, R. and Peters, K. J. (2018), Construction and Building Materials, 163(), 286-295.

Announcing the 2016 Measurement Science and Technology Outstanding Paper Awards

Foss, J. and Peters, K. and Yang, W. Q. (2017), Measurement Science & Technology, 28(7), .

Bi-directional ultrasonic wave coupling to FBGs in continuously bonded optical fiber sensing

Wee, J. and Hackney, D. and Bradford, P. and Peters, K. (2017), Applied Optics, 56(25), 7262-7268.

Composition and structure of porcine digital flexor tendon-bone insertion tissues

Chandrasekaran, S. and Pankow, M. and Peters, K. and Huang, H. Y. S. (2017), Journal of Biomedical Materials Research. Part A, 105(11), 3050-3058.

Dynamic polarization microscopy for in-situ measurements of collagen fiber realignment during impact

Wu, X. Y. and Huang, H. Y. S. and Pankow, M. and Peters, K. (2017), Conference Proceedings of the Society for Experimental Mechanics Series, (), 61-66.

High-speed interrogation of multiplexed fiber bragg gratings with spectral distortion

Van Hoe, B. and Oman, K. G. and Van Steenberge, G. and Stan, N. and Schultz, S. M. and Peters, K. J. (2017), IEEE Sensors Journal, 17(21), 6941-6947.

Highly anisotropic magneto-transport and field orientation dependent oscillations in aligned carbon nanotube/epoxy composites

Wells, B. and Kumar, R. and Reynolds, C. L. and Peters, K. and Bradford, P. D. (2017), Applied Physics Letters, 111(26), .

Interrogation of a spectral profile division multiplexed FBG sensor network using a modified particle swarm optimization method

Guo, G. D. and Hackney, D. and Pankow, M. and Peters, K. (2017), Measurement Science & Technology, 28(5), .

Mechanisms of signal coupling to optical fiber for FBG sensor detection of Lamb waves

Wee, J. and Hackney, D. and Bradford, P. and Peters, K. (2017), Proceedings of SPIE-the International Society for Optical Engineering, 10323(), .

Simulating increased Lamb wave detection sensitivity of surface bonded fiber Bragg grating

Wee, J. and Hackney, D. A. and Bradford, P. D. and Peters, K. J. (2017), Smart Materials & Structures, 26(4), .

A spectral profile multiplexed FBG sensor network with application to strain measurement in a Kevlar woven fabric

Guo, G. D. and Hackney, D. and Pankow, M. and Peters, K. (2017), Proceedings of SPIE-the International Society for Optical Engineering, 10168(), .

The adhesive effect on ultrasonic Lamb wave detection sensitivity of remotely-bonded fiber Bragg grating sensors

Wee, J. and Hackney, D. A. and Bradford, P. D. and Peters, K. J. (2017), Proceedings of SPIE-the International Society for Optical Engineering, 10168(), .

Fiber Bragg gratings as transient thermal gradient sensors

Hackney, D. A. and Peters, K. J. and Black, R. J. and Costa, J. M. and Moslehi, B. (2016), Optical Engineering, 55(11), .

Fiber-optic temperature profiling for thermal protection system heat shields

Black, R. J. and Costa, J. M. and Zarnescu, L. and Hackney, D. A. and Moslehi, B. and Peters, K. J. (2016), Optical Engineering, 55(11), .

Fiber-optic temperature profiling for thermal protection system heat shields (vol 55, 114101, 2016)

Black, R. J. and Costa, J. M. and Zarnescu, L. and Hackney, D. A. and Moslehi, B. and Peters, K. J. (2016), Optical Engineering, 55(11), .

Increasing signal amplitude in fiber Bragg grating detection of Lamb waves using remote bonding

Wee, J. and Wells, B. and Hackney, D. and Bradford, P. and Peters, K. (2016), Applied Optics, 55(21), 5564-5569.

Networking of optical fiber sensors for extreme environments

Peters, K. (2016), Proceedings of SPIE-the International Society for Optical Engineering, 9803(), .

Pulsed phase thermography imaging of fatigue-loaded composite adhesively bonded joints

Shin, P. H. and Webb, S. C. and Peters, K. J. (2016), NDT & E International, 79(), 7-16.

Sensitivity of contact-free fiber Bragg grating sensors to ultrasonic Lamb waves

Wee, J. and Hackney, D. and Peters, K. and Wells, B. and Bradford, P. (2016), Proceedings of SPIE-the International Society for Optical Engineering, 9803(), .

Split Hopkinson bar measurement using high-speed full-spectrum fiber Bragg grating interrogation

Seng, F. and Hackney, D. and Goode, T. and Shumway, L. and Hammond, A. and Shoemaker, G. and Pankow, M. and Peters, K. and Schultz, S. (2016), Applied Optics, 55(25), 7179-7185.

Announcing the 2014 Measurement Science and Technology outstanding paper awards

Foss, J. and Peters, K. and Yacoot, A. and Jakoby, B. and McGrath, J. (2015), Measurement Science & Technology, 26(7), .

Correction factors for cross-correlation processing of FBG sensor network data

Stewart, W. and Van Hoe, B. and Van Steenberge, G. and Shultz, S. and Peters, K. (2015), Proceedings of SPIE-the International Society for Optical Engineering, 9436(), .

Depth detection of bond defects in multilayered externally bonded CFRP-to-concrete using pulse phase thermography

Mabry, N. J. and Peters, K. J. and Seracino, R. (2015), Journal of Composites for Construction, 19(6), .

Evaluation of the integrity of 3D orthogonal woven composites with embedded polymer optical fibers

Hamouda, T. and Seyam, A. F. M. and Peters, K. (2015), Composites. Part B, Engineering, 78(), 79-85.

Instrumentation of integrally stiffened composite panel with fiber Bragg grating sensors for vibration measurements

Oman, K. and Van Hoe, B. and Aly, K. and Peters, K. and Van Steenberge, G. and Stan, N. and Schultz, S. (2015), Smart Materials & Structures, 24(8), .

Investigating the loss of an embedded perfluorinated optical fiber for different resin's gel time

Hamouda, T. and Seyam, A. F. M. and Peters, K. (2015), Fibers and Polymers, 16(10), 2135-2140.

Low-energy drop weight performance of cellular sandwich panels

Yang, L. and Harrysson, O. A. and West, H. A. and Cormier, D. R. and Park, C. and Peters, K. (2015), Rapid Prototyping Journal, 21(4), 433-442.

Non-destructive inspection of adhesively bonded joints using amplitude modulated thermography

Wu, X. and Peters, K. (2015), Experimental Mechanics, 55(8), 1485-1501.

Numerical simulation of phase images and depth reconstruction in pulsed phase thermography

Hernandez-Valle, S. and Peters, K. (2015), Measurement Science & Technology, 26(11), .

Polymer optical fibers integrated directly into 3D orthogonal woven composites for sensing

Hamouda, T. and Seyam, A. F. M. and Peters, K. (2015), Smart Materials & Structures, 24(2), .

Pulse phase thermography inspection of bond defects in environmentally conditioned FRP-to-concrete specimens

Mabry, N. and Seracino, R. and Peters, K. (2015), Structural Health Monitoring, (), 424-431.

Rapid processing of full-spectral data from embedded FBG sensors

Peters, K. and Webb, S. (2015), Structural Health Monitoring, (), 1729-1736.

Spectral profile tracking of multiplexed fiber Bragg grating sensors

Stewart, W. and Van Hoe, B. and Van Steenberge, G. and Schultz, S. and Peters, K. (2015), Optics Communications, 357(), 113-119.

Announcing the 2013 Measurement Science and Technology Outstanding Paper Awards

Foss, J. and Dewhurst, R. and Yacoot, A. and Tadigadapa, S. and Peters, K. (2014), Measurement Science & Technology, 25(7), .

Characterization of fatigue damage in adhesively bonded lap joints through dynamic, full-spectral interrogation of fiber Bragg grating sensors: 2. Simulations

Webb, S. and Shin, P. and Peters, K. and Zikry, M. A. and Stan, N. and Chadderdon, S. and Selfridge, R. and Schultz, S. (2014), Smart Materials & Structures, 23(2), .

Fiber Bragg grating spectral features for structural health monitoring of composite structures

Webb, S. and Peters, K. and Zikry, M. and Stan, N. and Chadderdon, S. and Selfridge, R. and Schultz, S. (2014), Proceedings of SPIE-the International Society for Optical Engineering, 9157(), .

Fiber bragg gratings for heat flux measurements in thermal protection systems under a steady conductive thermal load

Hackney, D. A. and Peters, K. J. and Black, R. J. and Costa, J. M. and Moslehi, B. and Zarnescu, L. (2014), Proceedings of the ASME Conference on Smart Materials Adaptive Structures and Intelligent Systems - 2013, vol 2, (), .

Increasing dynamic range of a fibre Bragg grating edge-filtering interrogator with a proportional control loop

Stan, N. and Bailey, D. C. and Chadderdon, S. L. and Webb, S. and Zikry, M. and Peters, K. J. and Selfridge, R. H. and Schultz, S. M. (2014), Measurement Science & Technology, 25(6), .

Localized measurements of composite dynamic response for health monitoring

Webb, S. and Oman, K. and Peters, K. and Stan, N. and Chadderdon, S. and Selfridge, R. and Schultz, S. (2014), Proceedings of SPIE-the International Society for Optical Engineering, 9062(), .

Announcing the 2012 Measurement Science and Technology Outstanding Paper awards

Foss, J. and Dewhurst, R. and Yacoot, A. and Regtien, P. and Peters, K. (2013), Measurement Science & Technology, 24(7), .

Characterization of fatigue damage in adhesively bonded lap joints through dynamic, full-spectral interrogation of fiber Bragg grating sensors

Webb, S. and Shin, P. and Peters, K. and Zikry, M. A. and Chadderdon, S. and Stan, N. and Selfridge, R. and Schultz, S. (2013), Proceedings of SPIE-the International Society for Optical Engineering, 8693(), .

Characterization of fatigue damage in adhesively bonded lap joints through dynamic, full-spectral interrogation of fiber bragg grating sensors

Webb, S. and Shin, P. and Peters, K. and Zikry, M. and Schultz, S. and Selfridge, R. (2013), Structural Health Monitoring 2013, Vols 1 and 2, (), 1953-1960.

Experimental and computational investigation of low-impact velocity and quasi-static failure of PMMA

Pearson, J. D. and LaBarbera, D. and Prabhugoud, M. and Peters, K. and Zikry, M. A. (2013), Experimental Mechanics, 53(1), 53-66.

Full-spectral interrogation of fiber bragg grating sensors exposed to steady-state vibration

Webb, S. and Peters, K. and Zikry, M. A. and Chadderdon, S. and Nikola, S. and Selfridge, R. and Schultz, S. (2013), Experimental Mechanics, 53(4), 513-530.

Hybrid imaging of damage progress in composites through thermal imaging and embedded sensing

Pawar, S. and Peters, K. (2013), Proceedings of SPIE-the International Society for Optical Engineering, 8693(), .

Nondestructive inspection in adhesive-bonded joint CFRP using pulsed phase thermography

Shin, P. H. and Webb, S. C. and Peters, K. J. (2013), Proceedings of SPIE-the International Society for Optical Engineering, 8705(), .

Nondestructive inspection of CFRP adhesively bonded joints using embedded FBG sensors

Webb, S. and Shin, P. and Peters, K. and Selfridge, R. and Schultz, S. (2013), Proceedings of SPIE-the International Society for Optical Engineering, 8722(), .

Self-healing sandwich structures incorporating an interfacial layer with vascular network

Chen, C. L. and Peters, K. and Li, Y. L. (2013), Smart Materials & Structures, 22(2), .

Through-the-thickness identification of impact damage in composite laminates through pulsed phase thermography

Pawar, S. S. and Peters, K. (2013), Measurement Science & Technology, 24(11), .

The viability and limitations of percolation theory in modeling the electrical behavior of carbon nanotube-polymer composites

Xu, S. and Rezvanian, O. and Peters, K. and Zikry, M. A. (2013), Nanotechnology, 24(15), .

Comparison of damage measures based on fiber Bragg grating spectra

Park, C. and Peters, K. (2012), Measurement Science & Technology, 23(2), .

Effect of resin type on the signal integrity of an embedded perfluorinated polymer optical fiber

Hamouda, T. and Peters, K. and Seyam, A. F. M. (2012), Smart Materials & Structures, 21(5), .

Full-spectral interrogation of fiber Bragg grating sensors for measurements of damage during steady-state vibration

Webb, S. and Peters, K. and Zikry, M. A. and Chadderdon, S. and Nikola, S. and Selfridge, R. and Schultz, S. (2012), Proceedings of SPIE-the International Society for Optical Engineering, 8346(), .

Full-spectrum FBG analysis of inhomogeneous, fast-varying strain effects

Peters, K. (2012), Proceedings of SPIE-the International Society for Optical Engineering, 8351(), .

Optimization of embedded sensor placement for structural health monitoring of composite airframes

Park, C. and Peters, K. (2012), AIAA Journal, 50(11), 2536-2545.

Self-healing sandwich composite structures

Fugon, D. and Chen, C. and Peters, K. (2012), Proceedings of SPIE-the International Society for Optical Engineering, 8345(), .

Self-repairing waveguide sensor with highly repeatable strain response

Song, Y. and Peters, K. (2012), Proceedings of SPIE-the International Society for Optical Engineering, 8346(), .

Self-repairing, interferometric waveguide sensor with a large strain range

Song, Y. J. and Peters, K. J. (2012), Applied Optics, 51(28), 6886-6895.

Analysis of fiber Bragg grating spectral features for in-situ assessment of composites

Peters, K. (2011), Proceedings of SPIE-the International Society for Optical Engineering, 7982(), .

Damage identification after impact in sandwich composites through embedded fiber bragg sensors

Hackney, D. and Peters, K. (2011), Journal of Intelligent Material Systems and Structures, 22(12), 1305-1316.

Full-spectral interrogation of fiber Bragg grating sensors for damage identification

Webb, S. and Noevere, A. and Peters, K. and Zikry, M. A. and Vella, T. and Chadderdon, S. and Selfridge, R. and Schultz, S. (2011), Proceedings of SPIE-the International Society for Optical Engineering, 7982(), .

Polymer optical fiber sensors-a review

Peters, K. (2011), Smart Materials & Structures, 20(1), .

Self-repairing polymer optical fiber sensor

Song, Y. and Peters, K. (2011), Proceedings of SPIE-the International Society for Optical Engineering, 7753(), .

Validation of a single-mode polymer optical fiber sensor and interrogator for large strain measurements

Abdi, O. and Peters, K. and Kowalsky, M. and Hassan, T. (2011), Measurement Science & Technology, 22(7), .

Wavelength hopping due to spectral distortion in dynamic fiber Bragg grating sensor measurements

Webb, S. and Peters, K. and Zikry, M. and Vella, T. and Chadderdon, S. and Selfridge, R. and Schultz, S. (2011), Measurement Science & Technology, 22(6), .

A self-repairing polymer waveguide sensor

Song, Y. J. and Peters, K. J. (2011), Smart Materials & Structures, 20(6), .

Analysis of fiber Bragg grating spectral features for in-situ assessment of sandwich composites

Hackney, D. and Webb, S. and Peters, K. (2010), Proceedings of the ASME Conference on Smart Materials, Adaptive Structures and Intelligent Systems, 2010, vol 2, (), 813-820.

Assessment of damage in composite laminates through dynamic, full-spectral interrogation of fiber Bragg grating sensors

Propst, A. and Peters, K. and Zikry, M. A. and Schultz, S. and Kunzler, W. and Zhu, Z. and Wirthlin, M. and Selfridge, R. (2010), Smart Materials & Structures, 19(1), .

Embedded fiber Bragg sensors for damage identification in sandwich composites after impact

Hackney, D. A. and Peters, K. J. (2010), Proceedings of SPIE-the International Society for Optical Engineering, 7648(), .

Full-spectrum interrogation of fiber Bragg gratings at 100 kHz for detection of impact loading

Vella, T. and Chadderdon, S. and Selfridge, R. and Schultz, S. and Webb, S. and Park, C. and Peters, K. and Zikry, M. (2010), Measurement Science & Technology, 21(9), .

Global and local fiber optic sensors for health monitoring of civil engineering infrastructure retrofit with FRP materials

Jiang, G. L. and Dawood, M. and Peters, K. and Rizkalla, S. (2010), Structural Health Monitoring, 9(4), 309-322.

Impact induced damage assessment in composite laminates through embedded fiber Bragg gratings

Webb, S. and Peters, K. and Zikry, M. A. and Vella, T. and Chadderdon, S. and Selfridge, R. and Schultz, S. (2010), Proceedings of SPIE-the International Society for Optical Engineering, 7648(), .

Peak wavelength interrogation of fiber Bragg grating sensors during impact events

Park, C. and Peters, K. and Zikry, M. and Haber, T. and Schultz, S. and Selfridge, R. (2010), Smart Materials & Structures, 19(4), .

SMASIS symposium on structural health monitoring preface

Joshi, S. and Peters, K. (2010), Journal of Intelligent Material Systems and Structures, 21(3), 223-223.

Self-repairing polymer optical fiber sensor

Song, Y. J. and Peters, K. J. (2010), Proceedings of SPIE-the International Society for Optical Engineering, 7648(), .

Transient infrared thermography for damage evaluation in aerospace composites

Pawar, S. and Peters, K. (2010), Proceedings of SPIE-the International Society for Optical Engineering, 7649(), .

The effects of embedded optical fiber density on the impact response and lifetime of laminated composites

Park, C. and Peters, K. and Zikry, M. (2010), Journal of Intelligent Material Systems and Structures, 21(18), 1819-1829.

The role of embedded sensors in damage assessment of composite laminates

Park, C. and Peters, K. and Zikry, M. (2010), Proceedings of SPIE-the International Society for Optical Engineering, 7648(), .

Calibration of a single-mode polymer optical fiber large-strain sensor

Kiesel, S. and Peters, K. and Hassan, T. and Kowalsky, M. (2009), Measurement Science & Technology, 20(3), 034016.

Cleaving of solid single mode polymer optical fiber for strain sensor applications

Abdi, O. and Wong, K. C. and Hassan, T. and Peters, K. J. and Kowalsky, M. J. (2009), Optics Communications, 282(5), 856-861.

Finite element simulation of self-writing waveguide formation through photopolymerization

Anderson, A. and Peters, K. (2009), Journal of Lightwave Technology, 27(24), 5529-5536.

Full-spectrum interrogation of fiber Bragg grating sensors for dynamic measurements in composite laminates

Schultz, S. and Kunzler, W. and Zhu, Z. and Wirthlin, M. and Selfridge, R. and Propst, A. and Zikry, M. and Peters, K. (2009), Smart Materials & Structures, 18(11), .

In-situ impact-induced damage assessment of woven composite laminates through a fibre Bragg grating sensor network

Garrett, R. C. and Peters, K. J. and Zikry, M. A. (2009), Aeronautical Journal, 113(1144), 357-370.

Sensor networks for in-situ failure identification in woven composites

Park, C. and Propst, A. and Peters, K. and Zikry, M. A. (2009), SMASIS 2009, vol 2, (), 477-485.

Large deformation in-fiber polymer optical fiber sensor

Kiesel, S. and Peters, K. and Hassan, T. and Kowalsky, M. (2008), IEEE Photonics Technology Letters, 20(5-8), 416-418.

A shear-lag model for three-dimensional, unidirectional multilayered structures

Jiang, G. L. and Peters, K. (2008), International Journal of Solids and Structures, 45(14-15), 4049-4067.

Behaviour of intrinsic polymer optical fibre sensor for large-strain applications

Kiesel, S. and Peters, K. and Hassan, T. and Kowalsky, M. (2007), Measurement Science & Technology, 18(10), 3144-3154.

Finite element analysis of multi-axis strain sensitivities of Bragg gratings in PM fibers

Prabhugoud, M. and Peters, K. (2007), Journal of Intelligent Material Systems and Structures, 18(8), 861-873.

Global-local assessment of low-velocity impact damage in woven composites

Pearson, J. D. and Zikry, M. A. and Prabhugoud, M. and Peters, K. (2007), Journal of Composite Materials, 41(23), 2759-2783.

Independent measurement of strain and sensor failure features in Bragg grating sensors through multiple mode coupling

Prabhugoud, M. and Peters, K. and Pearson, J. and Zikry, M. A. (2007), Sensors and Actuators. A, Physical, 135(2), 433-442.

Measurement of low velocity and quasi-static failure modes in PMMA

Pearson, J. D. and Zikry, M. A. and Prabhugoud, M. and Peters, K. (2007), Polymer Composites, 28(3), 381-391.

Oscillator interrogated time-of-flight optical fiber interferometer for global strain measurements

Jiang, G. L. and Van Vickle, P. and Peters, K. and Knight, V. (2007), Sensors and Actuators. A, Physical, 135(2), 443-450.

Finite element model for embedded fiber Bragg grating sensor

Prabhugoud, M. and Peters, K. (2006), Smart Materials & Structures, 15(2), 550-562.

Genetic algorithm for the reconstruction of Bragg grating sensor strain profiles

Gill, A. and Peters, K. and Studer, M. (2004), Measurement Science & Technology, 15(9), 1877-1884.

Modified transfer matrix formulation for Bragg grating strain sensors

Prabhugoud, M. and Peters, K. (2004), Journal of Lightwave Technology, 22(10), 2302-2309.

Multi-scale sensing for damage identification

Studer, M. and Peters, K. (2004), Smart Materials & Structures, 13(2), 283-294.

Efficient simulation of Bragg grating sensors for implementation to damage identification in composites

Prabhugoud, M. and Peters, K. (2003), Smart Materials & Structures, 12(6), 914-924.

Method for determination of crack bridging parameters using long optical fiber Bragg grating sensors

Studer, M. and Peters, K. and Botsis, J. (2003), Composites. Part B, Engineering, 34(4), 347-359.

Novel technique to measure axial strain distribution along fiber during pullout test

Peters, K. and Pattis, P. and Botsis, J. (2002), Journal of Materials Science Letters, 21(11), 887-891.

Studies on bridging tractions - simultaneous bridging tractions and COD measurements

Studer, M. and Pietrzyk, J. and Peters, K. and Botsis, J. and Giaccari, P. (2002), International Journal of Fracture, 114(4), 379-399.

Embedded optical fiber Bragg grating sensor in a nonuniform strain field: Measurements and simulations

Peters, K. and Studer, M. and Botsis, J. and Iocco, A. and Limberger, H. and Salathe, R. (2001), Experimental Mechanics, 41(1), 19-28.

View all publications via NC State Libraries

Grants

Investigation of Lamb Wave Interactions with Guided Modes in Optical Fibers

US Navy-Office Of Naval Research(7/01/18 - 6/30/21)

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Investigation of Lamb Wave Interactions with Guided Modes in Optical Fibers

Sponsor: US Navy-Office Of Naval Research

Start Date: 7/01/18

End Date: 6/30/21

Abstract

The goal of this project is to investigate the unusual behaviors observed in Lamb wave to optical fiber guided mode coupling. First, these modes will be mapped out in the structure, in the transition zone and in the optical fiber using a 3D micro-scale laser Doppler vibrometer. In particular, the conditions that launch forward and backward longitudinal modes in the optical fiber will be studied, in order to better understand the conditions that create directional behaviors. Next, additional components will be added into the bond region, for example protective tubing to identify potential interactions between the different components. Finally, interactions between the forward and backward longitudinal modes propagating in a single optical fiber will be forced to create hardware level signal processing for structural health monitoring.

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3D Micro Laser Doppler Vibrometer to Characterize Ultrasonic Waves in Naval Structures

US Navy-Office Of Naval Research(6/15/18 - 6/14/19)

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3D Micro Laser Doppler Vibrometer to Characterize Ultrasonic Waves in Naval Structures

Sponsor: US Navy-Office Of Naval Research

Start Date: 6/15/18

End Date: 6/14/19

Abstract

This DURIP proposal requests funds to purchase a 3D Microsystem Laser Doppler Vibrometer to characterize the signal transfer to a structural health monitoring (SHM) network of sensors mounted to the surface of naval structures. The equipment would support ongoing research at NCSU, sponsored by the Office of Naval Research to increase the quality of the signals received by the sensors and therefore the quality of the damage identification in the underlying naval structure. This characterization over a broad range of mounting parameters and configurations would permit the optimization of such sensor networks for military applications. By providing micro-scale, 3D displacement resolution, the equipment would provide both the in-plane and out-of-plane measurement of vibration amplitudes for ultrasonic waves in metallic structures and the vibration of the sensors in different excitation modes. These experiments would permit a quantitative measurement of the signal transfer between the host structure and the sensor that is not realizable to-date. The results of these experiments will be used to optimize the signal to noise ratio of various optical fiber sensor-mounting configurations for the nondestructive evaluation of the health of naval structures.

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Optimization of Structural Lamb Wave Coupling to Fiber Bragg Grating Sensors

US Navy-Office Of Naval Research(8/16/17 - 8/15/20)

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Optimization of Structural Lamb Wave Coupling to Fiber Bragg Grating Sensors

Sponsor: US Navy-Office Of Naval Research

Start Date: 8/16/17

End Date: 8/15/20

Abstract

Quantifying the role of different bond parameters on the sensitivity of FBG sensors to surface ultrasonic and acoustic emission waves and optimizing their performance as sensors, requires an integrated experimental, characterization and computational effort. This research project will investigate the role of viscosity on the measured signal amplitude and distortion in a FBG coupled to a structure with a viscous agent. Further, the signal distortion as a function of frequency through an adhesive bond to FBG sensor and how this maps to signal distortion in narrow bandwidth (Lamb waves) and broad bandwidth excitations (acoustic emission) will be quantified. We will focus on FBG sensor measurement of two different excitation signals: Lamb waves due to a narrowband PZT actuator and acoustic emission signals. The primary difference between these two cases is the bandwidth of frequencies in the signals, changing the level of dispersion and therefore its relative influence on the output signal. Finally, the strength and fatigue life of high sensitivity fiber Bragg gratings from a novel fabrication process will be experimentally measured.

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Aerodynamic Forces on Slender Body in Supersonic Cavity

Air Force Research Laboratory (AFRL)(7/09/16 - 9/30/19)

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Aerodynamic Forces on Slender Body in Supersonic Cavity

Sponsor: Air Force Research Laboratory (AFRL)

Start Date: 7/09/16

End Date: 9/30/19

Abstract

The purpose of this project is to investigate the magnitude of lift and pitching moment variation during an unsteady vs. the quasi-steady translation of a slender body from a cavity through a vortex-shear layer into supersonic flow. Mean- and time-varying, as well as frequency content of the normal force and pitching moment will be recorded. To correlate the forces on the store, simultaneous flowfield information, as well as surface pressure data will be obtained. The future application is to investigate whether timed-release of stores from cavities offer a benefit in a more accurate prediction of safe trajectory from the air vehicle.

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IPA Assignment Agreement for Dr. Kara J. Peters

National Science Foundation (NSF)(9/08/15 - 5/31/18)

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IPA Assignment Agreement for Dr. Kara J. Peters

Sponsor: National Science Foundation (NSF)

Start Date: 9/08/15

End Date: 5/31/18

Abstract

Attached

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Spectral Profile Multiplexing of FBG Sensors to Enable Low-Power Optical Sensor Networks

National Science Foundation (NSF)(9/01/15 - 8/31/19)

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Spectral Profile Multiplexing of FBG Sensors to Enable Low-Power Optical Sensor Networks

Sponsor: National Science Foundation (NSF)

Start Date: 9/01/15

End Date: 8/31/19

Abstract

We propose to derive and implement a novel multiplexing strategy for large FBG sensor networks that would enable the interrogation of these networks with low-power, low-bandwidth sources. The ultimate goal is to permit the integration of FBG sensor networks into wireless communication systems. The multiplexing strategy is based on identifying the unique spectral profile of each sensor through a rapid, cross-correlation algorithm. The cross-correlation algorithm will be supplemented with penalty functions based on prior information to reduce identification errors. The multiplexing strategy will be demonstrated on two applications: crash testing of automotive composites and lightening strike identification.

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High-density fiber Bragg Grating Sensor Networks for NDE of Composite Materials

American Society for Nondestructive Testing, Inc.(8/15/15 - 8/14/16)

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High-density fiber Bragg Grating Sensor Networks for NDE of Composite Materials

Sponsor: American Society for Nondestructive Testing, Inc.

Start Date: 8/15/15

End Date: 8/14/16

Abstract

The major aim of this research is to derive, implement and test signal-processing algorithms that would enable high-density fiber Bragg grating sensor networks for integration into composite materials for nondestructive testing of composite aircraft structures. By enabling high density sensor networks that operate with low-power sources, high fidelity information can be obtained to during cure monitoring, in-service structural health monitoring and during offline inspections. This research program will be combined with a PhD program of study in aerospace engineering to produce graduate research training in nondestructive testing of composite airframe materials in the Department of Mechanical and Aerospace Engineering at North Carolina State University.

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High Repetition-Rate Shape Sensing Using Fiber Bragg Gratings (HISS)

US Dept. of Defense (DOD)(9/09/15 - 12/08/18)

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High Repetition-Rate Shape Sensing Using Fiber Bragg Gratings (HISS)

Sponsor: US Dept. of Defense (DOD)

Start Date: 9/09/15

End Date: 12/08/18

Abstract

The objective of the proposed effort is to develop a technology that will enable high repetition-rate shape sensing in a wide range of settings and can be integrated into the protective materials. The focus of this technology development is to improve the measurement of dynamic back face deformation (BFD) of body armor at a high repetition-rate. This will overcome two deficiencies in existing body armor testing and evaluation. First of all, the measurement system can be embedded into the material that simulates the body and does not require an exposed view of the backing material under test. Furthermore, it enables dynamic measurement of the BFD, not just post impact analysis of the deformed backing material. This allows researchers to perform a more realistic potential blunt force trauma analysis.

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REU Site: Summer Internships in Composites for Extreme Performance

National Science Foundation (NSF)(2/01/15 - 1/31/19)

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REU Site: Summer Internships in Composites for Extreme Performance

Sponsor: National Science Foundation (NSF)

Start Date: 2/01/15

End Date: 1/31/19

Abstract

Advanced composite materials are revolutionizing the fields of transportation (including the aerospace, naval, automotive, and rail industries), alternative energy generation and infrastructures. In this REU Site, the student interns will be paired with individual research mentors and will spend the majority of their experience working in the laboratory. In addition, the interns will attend weekly interactive research training seminars with their cohort and will participate in two site visits to advanced composite industries in North Carolina. As part of their research experience the interns will prepare and present a poster at the Undergraduate Research Symposium at NCSU. To incentivize the poster quality, the top three posters will be selected from the cohort and the winners will be funded by the REU site program to present their research at the SAMPE meeting in the following spring.

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High Sensitivity Fiber Bragg Grating Sensors through Carbon Nanotube Coatings and Adhesives

US Navy-Office Of Naval Research(5/15/14 - 5/14/17)

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High Sensitivity Fiber Bragg Grating Sensors through Carbon Nanotube Coatings and Adhesives

Sponsor: US Navy-Office Of Naval Research

Start Date: 5/15/14

End Date: 5/14/17

Abstract

We propose to significantly increase the strain transfer from a substrate to fiber Bragg gratings sensors over a broadband of frequencies by directly applying a stiff carbon nanotube (CNT) interface to the optical fiber surface without long-term degradation of the fiber strength and performance. We will work towards this solution using two approaches. The first approach will be to coat the optical fibers with millimeter long, aligned CNTs which will be drawn from special CNT arrays and wrapped onto the fibers. The CNT sheets can be wrapped onto the optical fibers in the dry state for incorporation into adhesive, or wrapped with CNT sheet that is impregnated with a thermosetting polymer system. The second approach will be to replace the adhesive used to mount the sensors onto a composite structure with a stiff CNT adhesive tape with the sensor embedded in the adhesive strips.

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