Composite Testing and Evaluation

 

Journal Publications

 

  1. Ghasr, M.T., M.J. Horst, M. Lechuga, R. Rapoza, C. Renoud and R. Zoughi, “Accurate One-Sided Microwave Thickness Evaluation of Lined-Fiberglass Composites,” IEEE Transactions on Instrumentation and Measurement, vol. 64, no. 10, pp. 2802-2812, October 2015.
  2. Kempin, M., M.T. Ghasr and R. Zoughi, “Modified Waveguide Flange for Evaluation of Stratified Composites,” IEEE Transactions on Instrumentation and Measurement, vol. 63, no. 6, pp. 1524-1534, June 2014.
  3. Donnell, K.M. and R. Zoughi, “Application of Embedded Dual-Loaded Modulated Scatterer Technique (MST) to Multilayer Structures,” IEEE Transactions on Instrumentation and Measurement, vol. 61, no. 10, pp. 2809-2816, October 2012.
  4. Williams, D.F., M.T. Ghasr, B. Alpert, Z. Shen, A. Arsenovic, R.M. Weikle, and R. Zoughi, “Legendre Fit of the Reflection Coefficient of a Radiating Rectangular Waveguide Aperture,” IEEE Transactions on Antennas and Propagation, vol. 60, no. 8, pp. 4009-4014, August 2012.
  5. Donnell, K., M. A. Abou-Khousa, M. Belayneh, and R. Zoughi, “Dual-Loaded Modulated Dipole Scatterer as an Embedded Sensor,” IEEE Transactions on Instrumentation and Measurement, vol. 60, no. 5, pp. 1884-1892, May 2011.
  6. Ghasr, M., D. Simms and R. Zoughi, “Multimodal Solution for a Waveguide Radiating into Multilayered Structures - Dielectric Property and Thickness Evaluation,” IEEE Transactions on Instrumentation and Measurement, vol. 58, no. 5, pp. 1505-1513,May 2009.
  7. Munoz, K.M. and R. Zoughi, “Improvements of Probe Response Extraction Using Time Domain Gating for Embedded Modulated Scatterer Technique,” Materials Evaluation, vol. 66, no. 10, pp. 1084-1090, October 2008.
  8. Nanni, E., M. Abou-Khousa, S. Kharkovsky, R. Zoughi and R. Austin, “Near-Field Microwave In-Process Thickness monitoring of Coatings Undergoing Curing,” Materials Evaluation, vol. 66, no. 8, pp. 865-870, August 2008.
  9. Kharkovsky, S., E.A. Nanni and R. Zoughi, “Application of Frustrated Total Internal Reflection of Millimeter Waves for Detection and Evaluation of Disbonds in Dielectric Joints,” Applied Physics Letters, vol. 92, issue 9, 094101, p. 3, March 4 2008.
  10. Kharkovsky, S., A.C. Ryley, V. Stephen and R. Zoughi, “Dual-Polarized Near-Field Microwave Reflectometer for Non-Invasive Inspection of Carbon Fiber Reinforced Polymer (CFRP)-Strengthened Structures,” IEEE Transactions on Instrumentation and Measurement, vol. 57, no. 1, pp. 168-175, January 2008.
  11. Kharkovsky, S., R. Zoughi and F.L. Hepburn, ”High Resolution Millimeter Wave Imaging of Space Shuttle Fuel Tank Spray-On-Foam Insulation,” Materials Evaluation, vol. 65, no. 12, pp. 1220-1229, December 2007.
  12. Abou-Khousa, M., and R. Zoughi, “Disbond Thickness Evaluation Employing Multiple-Frequency Near-Field Microwave Measurements,” IEEE Transactions on Instrumentation and Measurement, vol. 56, no. 4, pp. 1107-1113, August 2007.
  13. Kharkovsky, S., J.T. Case, M. A. Abou-Khousa, R. Zoughi and F. Hepburn, “Millimeter Wave Detection of Localized Anomalies in the Space Shuttle External Fuel Tank Insulating Foam,” IEEE Transactions on Instrumentation and Measurement, vol. 55, no. 4, pp. 1250-1257, August 2006.
  14. Nadakuduti, J., G. Chen and R. Zoughi, “Semi-Empirical Electromagnetic Modeling of Crack Detection and Sizing in Cement-Based Materials Using Near-Field Microwave Methods,” IEEE Transactions on Instrumentation and Measurement, vol. 55, no. 2, pp. 588-597, April 2006.
  15. Kharkovsky, S., F. Hepburn, J. Walker and R. Zoughi, “Testing of the Space Shuttle External Tank SOFI using Near-Field and Focused Millimeter Wave Nondestructive Testing Techniques,” Materials Evaluation, vol. 63, no. 5, pp. 516-522, May 2005.
  16. Shrestha, S., S. Kharkovsky, R. Zoughi and F. Hepburn, “Microwave and Millimeter Wave Nondestructive Evaluation of the Space Shuttle External Tank Insulating Foam,” Materials Evaluation, vol. 63, no. 3, pp. 339-344, March 2005.
  17. Akuthota, B., D. Hughes, R. Zoughi, J. Myers and T. Nanni, “Near-Field Microwave Detection of Disbond in Carbon Fiber Reinforced Polymer (CFRP) Composites Used for Strengthening Cement-Based Structures and Disbond Repair Verification,” ASCE Journal of Materials in Civil Engineering, vol. 16, no. 6, pp. 540-546, December 2004.
  18. Qaddoumi, N., T. Bigelow, R. Zoughi, L. Brown and M. Novack, “Reduction of Sensitivity to Surface Roughness and Slight Standoff Distance Variations in Microwave Inspection of Thick Composite Structures,” Materials Evaluation, vol. 60, no. 2, pp. 165-170, February 2002.
  19. Zoughi, R., J. Lai and K. Monuz, “A Brief Review of Microwave Inspection of Stratified Composite Structures: A Comparison Between Plane-Wave and Near-Field Approaches,” Materials Evaluation, vol. 60, no. 2, pp. 171-177, February 2002.
  20. Hughes, D., N. Wang, T. Case, K. Donnell, R. Zoughi, R. Austin and M. Novack “Microwave Nondestructive Detection of Corrosion Under Thin Paint and Primer in Aluminum Panels,” Special Issue of Subsurface Sensing Technologies and Applications: on Advances and Applications in Microwave and Millimeter Wave Nondestructive Evaluation, vol. 2, no. 4, pp. 435-451, 2001.
  21. Qaddoumi, N. and R. Zoughi, “Preliminary Study of the Influences of Effective Dielectric Constant and Non-Uniform Probe Aperture Field Distribution on Near-Field Microwave Images,” Materials Evaluation, vol. 55, no. 10, pp. 1169-1173, October, 1997.
  22. Ranu, E. and R. Zoughi, “Near-Field Microwave Nondestructive Distinction Between Surface Height Variations and Defects in Thick Sandwich Composites Using Standoff Distance Optimization,” Nondestructive Testing & Evaluation, vol. 13, pp. 215-225, 1997.
  23. Gray, S. and R. Zoughi, “Dielectric Sheet Thickness Variation and Disbond Detection in Multi-Layered Composites Using an Extremely Sensitive Microwave Approach,” Materials Evaluation, vol. 55, no. 1, pp. 42-48, 1997.
  24. Qaddoumi, N., R. Zoughi and G.W. Carriveau, “Microwave Detection and Depth Determination of Disbonds in Low-Permittivity and Low-Loss Thick Sandwich Composites,” Research in Nondestructive Evaluation, vol. 8, no. 1, pp. 51-63, 1996.
  25. Qaddoumi, N., S. Ganchev and R. Zoughi, “Microwave Diagnosis of Low Density Glass Fibers with Resin Binder,” Research in Nondestructive Evaluation, vol. 8, no. 3, pp. 177-188, 1996.
  26. Bakhtiari, S., S. Ganchev and R. Zoughi, “A Generalized Formulation for Admittance of an Open-Ended Rectangular Waveguide Radiating into Stratified Dielectrics,” Research in Nondestructive Evaluation, vol. 7, no. 2/3, pp. 75-87, 1995.
  27. Ganchev, S., N. Qaddoumi, S. Bakhtiari and R. Zoughi, “Calibration and Measurement of Dielectric Properties of Finite Thickness Composite Sheets with Open-Ended Coaxial Sensors,” IEEE Transactions on Instrumentation and Measurement, vol. IM-44, no. 6, p. 1023-1029, December, 1995.
  28. Qaddoumi, N., S.I. Ganchev, G. Carriveau and R. Zoughi, “Microwave Imaging of Thick Composites with Defects,” Materials Evaluation, vol. 53, no. 8, pp. 926-929, August, 1995.
  29. Ganchev, S., N. Qaddoumi, E. Ranu and R. Zoughi, “Microwave Detection Optimization of Disbond in Layered Dielectrics with Varying Thicknesses,” IEEE Transactions on Instrumentation and Measurement, vol. IM-44, no. 2, pp. 326-328, April, 1995.
  30. Gray, S., S. Ganchev, N. Qaddoumi, G. Beauregard, D. Radford and R. Zoughi, “Porosity Level Estimation in Polymer Composites Using Microwaves,” Materials Evaluation, vol. 53, no. 3, pp. 404-408, March, 1995.
  31. Qaddoumi, N. and R. Zoughi, “Microwave Scattering Characteristics of Defective Dielectric Cylinders,” NDT&E International, vol. 27, no. 6, pp. 299-305, 1994.
  32. Bakhtiari, S., S. Ganchev and R. Zoughi, “Analysis of the Radiation of an Open-Ended Coaxial Line into Stratified Dielectrics,” IEEE Transactions on Microwave Theory and Techniques, vol. 42, no. 7, pp. 1261-1267, July, 1994.
  33. Bakhtiari, S., S. Ganchev, N. Qaddoumi and R. Zoughi, “Microwave Non-Contact Examination of Disbond and Thickness Variation in Stratified Composite Media,” IEEE Transactions on Microwave Theory and Techniques, vol. 42, no. 3, pp. 389-395, March, 1994.
  34. Edwards, J. and R. Zoughi, “Microwave Sensitivity Maximization of Disbond Characterization in Conductor Backed Dielectric Composites,” Journal of Nondestructive Evaluation, vol. 12, no. 3, pp. 193-198, September, 1993.
  35. Bakhtiari, S., S. Ganchev and R. Zoughi, “Microwave Frequency Optimization for Accurate Thickness or Dielectric Property Monitoring of Conductor Backed Composites,” Materials Evaluation, vol. 51, no. 6, pp. 740-743, June, 1993.
  36. Bakhtiari, S., S. Ganchev and R. Zoughi, “Open-Ended Rectangular Waveguide for Nondestructive Thickness Measurement and Variation Detection of Lossy Dielectric Slabs Backed by a Conducting Plate,” IEEE Transactions on Instrumentation and Measurement, vol. 42, no. 1, pp. 19-24, February, 1993.
  37. Ganchev, S., S. Bakhtiari and R. Zoughi, “A Novel Numerical Technique for Dielectric Measurement of Lossy Dielectrics,” IEEE Transactions on Instrumentation and Measurement, vol. IM-41, no. 3, pp. 361-365, June, 1992.
  38. Zoughi, R., J. Edwards and S. Bakhtiari, “Swept Microwave Frequency Nondestructive Detection and Evaluation of Delamination in Stratified Dielectric Media,” Journal of Wave-Material Interaction, vol. 7, no. 1, pp. 427-438, January, 1992.
  39. Zoughi, R. and S. Bakhtiari, “Microwave Nondestructive Detection and Evaluation of Void in Layered Dielectric Slabs,” Research in Nondestructive Evaluation, vol. 2, no. 4, pp. 195-205, 1990.
  40. Bakhtiari, S., and R. Zoughi, “Microwave Thickness Measurement of Lossy Layered Dielectric Slabs Using Incoherent Reflectivity,” Research in Nondestructive Evaluation, vol. 2, no. 3, pp. 157-168, 1990.
  41. Zoughi, R. and S. Bakhtiari, “Microwave Nondestructive Detection and Evaluation of Disbonding and Delamination in Layered-Dielectric-Slabs,” IEEE Transactions on Instrumentation and Measurement, vol. 39, no. 6, pp. 1059-1063, December, 1990.
  42. Zoughi, R. and M. Lujan, “Nondestructive Microwave Thickness Measurement of Dielectric Slabs,” Materials Evaluation, vol. 48, no. 9, pp. 1100-1105, September, 1990.

 

Conference Presentations and Proceedings Papers

 

  1. Zoughi, R., J.R. Gallion, M. Horst and M.T. Ghasr, “Microwave Accurate Evaluation of Dielectric Coatings on Carbon Composite Structures,” Presented at the 42nd Annual Review of Progress in Quantitative Nondestructive Evaluation Conference, Minneapolis, MN, July 27-31, 2015.
  2. Case, J.T., M. Ghasr, R. Zoughi, “Advances in Dielectric Property and Thickness Evaluation of Layered Composite Structures using Open-Ended Waveguides,” Presented at the 14th International Symposium on Nondestructive Characterization of Materials, Marina Del Rey, CA, June 23-26, 2015.
  3. Foudazi, A., M.T. Ghasr, K.M. Donnell, "Application of active microwave thermography to inspection of carbon fiber reinforced composites," Proceedings of the 2014 IEEE AUTOTESTCON, pp. 318-322, 15-18 Sept. 2014.
  4. Foudazi, A., M.T. Ghasr, and K.M. Donnell, “Application of Active Microwave Thermography to Delamination Detection”, Proceedings of the International Instrumentation and Measurement Technology Conference (I2MTC), pp. 1567-1571, May 12-15, 2014, Montevideo, Uruguay.
  5. Ghasr, M.T. and R. Zoughi, “3D Millimeter Wave Imaging of Vertical Cracks and its Application for the Inspection of HDPE Pipes,” Proceedings of the 40th Annual Review of Progress in Quantitative Nondestructive Evaluation Conference, American Institute of Physics, Conference Proceedings 1581, vol. 33A, pp. 1531-1536, 2014.
  6. Kempin, M., M.T. Ghasr, and R. Zoughi, “Finite Flange Correction for Microwave and Millimeter-Wave Nondestructive Material Characterization,” Proceedings of the IEEE International Instrumentation and Measurement Technology Conference (I2MTC), pp. 1435-1440, Minneapolis, MN, May 6-9, 2013.
  7. Ghasr, M.T., and R. Zoughi, “Microwave Guided Wave Attenuation Measurement of Thin Coatings”, Presented at the American Society for Nondestructive (ASNT) Spring Conference, Memphis, TN, March 18-21, 2013.
  8. Ghasr, M.T., K. Donnell and R. Zoughi, “Microwave Evaluation of Transmission-Through Properties of Films and Sheets Using One-Sided Reflection-Only Measurements,” Presented at the American Society for Nondestructive (ASNT) Spring Conference, Dallas, TX, March 19-23, 2012.
  9. Fallahpour, M., H. Kajbaf, M. T. Ghasr, J. T. Case and R. Zoughi, “Simultaneous Evaluation of Multiple Key Material Properties of Complex Stratified Structures with Large Spatial Extent,” Proceedings of the Review of Progress in Quantitative Nondestructive Evaluation, vol. 31A, Burlington, VT, July 17-22, vol. 1430, AIP Conference Proceedings, edited by D.O. Thompson and D.E. Chimenti, American Institute of Physics, pp. 561-565, Melville, NY, 2011.
  10. Donnell, K.M. and R. Zoughi, “Application of the Dual-Loaded Modulated Scatterer Technique to Multilayered Material Evaluation,” Proceedings of the IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2011), pp. 43-46, Binjiang, Hangzhou, China, May 10-12, 2011.
  11. Donnell, K. M., M. A. Abou-Khousa, M. Belayneh, and R. Zoughi, “Theoretical and Experimental Foundation of Dual-Loaded Dipole Scatterer as an Embedded Sensor”, Proceedings of the IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2010), Austin, TX, pp. 1091-1095, May 3-6 2010.
  12. Kharkovsky, S., R. Zoughi, “Influence of Incidence Angle on Spatial Resolution in Swept Frequency Microwave NDT Measurements,” Presented at the American Society for Nondestructive Testing (ASNT) 2010 19th Annual Research Symposium & Spring Conference, Williamsburg, VA, USA, March 22-26, 2010.
  13. Tralshawala, N., W. Faidi, S. Nath, S. Kharkovsky and R. Zoughi, “Wind Turbine Blade Samples Inspection using Microwaves,” Presented at the American Society for Nondestructive Testing (ASNT) 2010 19th Annual Research Symposium & Spring Conference, Williamsburg, VA, USA, March 22-26, 2010.
  14. Kharkovsky, S., M.T. Ghasr, M.A. Abou-Khousa and R. Zoughi, “Near-field microwave and mm-wave noninvasive diagnosis of human skin,” Proceedings of the IEEE International Workshop on Medical Measurement and Applications (MeMeA 2009), pp. 5-7, Cetraro, Italy, May 29-30, 2009.
  15. Abou-Khousa, M.A., D.L. Simms, S. Kharkovsky, and R. Zoughi, “High-resolution short-range wideband FMCW radar measurements based on MUSIC algorithm,” Proc. of the IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2009), pp. 498-501 Singapore, 5-7, May 2009.
  16. Kharkovsky, S. and R. Zoughi, “Near-field millimeter wave non-contact measurement of step and gap mismatch in aircraft and automotive panels,” Proc. of the IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2009), pp. 728-731, Singapore, 5-7 May 2009.
  17. Carroll, B. S. Kharkovsky, R. Zoughi and R. Limmer, “Frequency-modulated continuous-wave (FM-CW) radar for evaluation of refractory structures used in glass manufacturing furnaces,” in Review of Progress in Quantitative Nondestructive Evaluation Vol. 28A, Chicago, IL, July 21- July 25, 2008, vol. 1096, AIP Conference Proceedings, edited by D.O. Thompson and D.E. Chimenti, American Institute of Physics, pp. 402-409, Melville, NY, 2009.
  18. Kharkovsky, S., R. Zoughi, J. Smith, B. Davis and R. Limmer, “Microwave measurement of refractory materials at high-temperature,” in Review of Progress in Quantitative Nondestructive Evaluation Vol. 28B, Chicago, IL, July 21- July 25, 2008, vol. 1096, AIP Conference Proceedings, edited by D.O. Thompson and D.E. Chimenti, American Institute of Physics, pp. 1703-1710, Melville, NY, 2009.
  19. Munoz, K., and R. Zoughi, “Improvement of Probe Response Extraction Using Ratio Technique for Embedded Modulated Scatterer Technique” Presented at the American Society for Nondestructive Testing (ASNT) Fall 2008 Conference, Charleston, SC, November 10-14, 2008.
  20. Ghasr, M.T., and R. Zoughi, “Multimodal Solution for a Rectangular Waveguide Radiating into a Multilayered Dielectric Structure and its Application for Dielectric Property and Thickness Evaluation,” Proceedings of the IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2008), pp. 552-556, Victoria, Vancouver Island, Canada, May 12–15, 2008.
  21. Ravouri, M., M.A. Abou-Khousa, S. Kharkovsky, R. Zoughi and R. Austin “Microwave and Millimeter Wave Near-Field Methods for Evaluation of Radome Composites,” Proceedings of the Thirty-Fourth Annual Review of the Quantitative Nondestructive Evaluation Conference, vol. 27B, pp. 976-981, Golden, CO, July 22- July 27, 2007.
  22. Kharkovsky, S., R. Zoughi and F.L. Hepburn “Sources and Remedies for Removing Unwanted Reflections in Millimeter Wave Images of Complex SOFI-Covered Space Shuttle Structures,” Proceedings of the Thirty-Fourth Annual Review of the Quantitative Nondestructive Evaluation Conference, vol. 27B, pp. 1010-1017, Golden, CO, July 22- July 27, 2007.
  23. J.T. Case, S. Kharkovsky, R. Zoughi, G. Steffes and F.L. Hepburn, “Millimeter wave holographical inspection of honeycomb composites,” in Review of Progress in Quantitative Nondestructive Evaluation Vol. 27B, Golden, Colorado, July 22 – July 27, 2007, vol.975, AIP Conference Proceedings, edited by D.O. Thompson and D.E. Chimenti, American Institute of Physics, Melville, NY, 2008, pp. 970-975.
  24. Ghasr, M.T., R. Zoughi and G. Steffes, “Estimation of Corrosion Thickness under Paint using a Simple Millimeter Wave Probe”, Proceedings of the 3nd International Conference on Electromagnetic Near-Field Characterization & Imaging (ICONIC 2007), St. Louis, USA, 27 – 29 June 2007, pp. 83-88.
  25. Munoz, K.  and R. Zoughi, “Application of Swept Frequency Measurements to the Embedded Modulated Scatterer Technique”, Proceedings of the 3nd International Conference on Electromagnetic Near-Field Characterization & Imaging (ICONIC 2007), St. Louis, USA, 27 – 29 June 2007, pp. 176 - 181.
  26. Randazzo, A., M. A. Abou-Khousa, M. Pastorinoand R. Zoughi, “High Resolution Near-Field Multiple Target Detection and Localization using Support Vector Machines”, Proceedings of the 3nd International Conference on Electromagnetic Near-Field Characterization & Imaging (ICONIC 2007), St. Louis, USA, 27 – 29 June 2007, pp. 261- 266.
  27. Kharkovsky, S., R. Zoughi and Frank L. Hepburn, “Comparison of Focused and Near-Field Imaging of Spray on Foam Insulation (SOFI) at Millimeter Wave Frequencies”, Proceedings of the 3nd International Conference on Electromagnetic Near-Field Characterization & Imaging (ICONIC 2007), St. Louis, USA, 27 – 29 June 2007, pp. 369 - 374.
  28. Kharkovsky, S., E.A. Nanni, R. Zoughi, J. Yu and R. Wilson, “A Novel Near-Field Millimeter Wave Nondestructive Inspection Technique for Detecting and Evaluating Anomalies in Polymer Joints”, Proceedings of the 3nd International Conference on Electromagnetic Near-Field Characterization & Imaging (ICONIC 2007), St. Louis, USA, 27 – 29 June 2007, pp. 375 - 380.
  29. Case, J.T., S. Kharkovsky, R. Zoughi and F. Hepburn, “High Resolution Millimeter Wave Inspecting of the Orbiter Acreage Heat Tiles of the Space Shuttle”, Proceedings of the IEEE Instrumentation and Measurement Technology Conference, #7694, Warsaw, Poland, 2007.
  30. Kharkovsky, S., R. Zoughi and J. Robbins, “Near-Field Microwave Inspection of Carbon Fiber Reinforced Polymer (CFRP)-Strengthened Civil Structural Members,” Presented at the 2006 NDE Conference on Civil Engineering, St. Louis, Missouri, 14 – 18 August 2006.
  31. Kharkovsky, S., R. Zoughi and F. Hepburn, “High Resolution Millimeter Wave Detection of Vertical Cracks in the Space Shuttle External Tank Spray-on-Foam Insulation (SOFI),” Proceedings of the Thirty-Third Annual Review of the Quantitative Nondestructive Evaluation Conference, vol. 26B, pp. 1065-1070, Portland, Oregon, July 31- August 5, 2006.
  32. Abou-Khousa, M.A., A. Ryley, S. Kharkovsky, R. Zoughi, D. Daniels, N. Kreitinger and G. Steffes, “Comparison of X-ray, Millimeter Wave, Shearography and Through-Transmission Ultrasonic Methods for Inspection of Honeycomb Composites,” Proceedings of the Thirty-Third Annual Review of the Quantitative Nondestructive Evaluation Conference, vol. 26B, pp. 999-1006, Portland, Oregon, July 31- August 5, 2006.
  33. Kharkovsky, S., J.T. Case, R. Zoughi and F. Hepburn, “Overview of High-Resolution Nondestructive Inspection of the Space Shuttle External Tank (ET) Spray-on-Foam Insulation (SOFI) and Acreage Heat tiles using Focused, Synthetic and Holographical Millimeter Wave Techniques,” Presented at the National Space and Missile Materials Symposium, Orlando, FL, June 26-30, 2006. Recipient of Best Poster Award in category.
  34. Abou-Khousa, A.K. and R. Zoughi, “High Accuracy Disbond Thickness Estimation Scheme Employing Multiple-Frequency Near-Field Microwave Measurements,” Proceedings of the IEEE Instrumentation and Measurement Technology Conference (IMTC06), pp. 1967-1970, Sorrento, Italy, April 24-27, 2006.
  35. Kharkovsky, S., A. Ryley, V. Stephen and R. Zoughi, “Dual-Polarized Microwave Near-Field Non-invasive Inspection of Carbon Fiber Reinforced Polymer (CFRP) Strengthened Civil Structures,” Proceedings of the IEEE Instrumentation and Measurement Technology Conference (IMTC06), pp. 2108-2111, Sorrento, Italy, April 24-27, 2006.
  36. Case, J.T., F. Hepburn and R. Zoughi, “Inspection of Spray on Foam Insulation (SOFI) Using Microwave and Millimeter Wave Synthetic Aperture Focusing and Holography,” Proceedings of the IEEE Instrumentation and Measurement Technology Conference (IMTC06), pp. 2148-2153, Sorrento, Italy, April 24-27, 2006.
  37. Kharkovsky, S., R. Zoughi and F. Hepburn, “High-Resolution Inspection of the Space Shuttle External Tank Spray-on-Foam Insulation (SOFI) Using Focused Millimeter Waves at D-Band (150 GHz),” Presented at the American Society for Nondestructive Testing (ASNT) Spring 2006 15th Annual Research Symposium, Orlando, March 13-17, 2006.
  38. Ghasr, M.T., S. Kharkovsky, R. Zoughi, M. O’Keefe and D. Palmer, “Millimeter Wave Imaging of Corrosion under Paint: Comparison of Two Probes,” Proceedings of the Thirty Second Annual Review of Progress in Nondestructive Evaluation, vol. 25A, pp. 447-454, Brunswick, Maine, July 31- August 5, 2005.
  39. Kharkovsky, S. and R. Zoughi, “Millimeter Wave Nondestructive Evaluation of Corrosion under Paint in Steel Structures,” Proceedings of the Thirty Second Annual Review of Progress in Nondestructive Evaluation, vol. 25B, pp. 1277-1283, Brunswick, Maine, July 31- August 5, 2005.
  40. Case, J.T., J. Robbins, S. Kharkovsky, R. Zoughi and F. Hepburn, “Microwave and Millimeter Wave Imaging of the Space Shuttle External Tank Spray on Foam Insulation (SOFI) Using Synthetic Aperture Focusing Techniques (SAFT),” Proceedings of the Thirty Second Annual Review of Progress in Nondestructive Evaluation, vol. 25B, pp. 1546-1553, Brunswick, Maine, July 31- August 5, 2005.
  41. Zoughi, R., S. Kharkovsky and F. Hepburn, “Microwave and Millimeter Wave Testing for the Inspection of the Space Shuttle Spray on Foam Insulation (SOFI) and the Acreage Heat Tiles,” Proceedings of the Thirty Second Annual Review of Progress in Nondestructive Evaluation, vol. 25A, pp. 439-446, Brunswick, Maine, July 31- August 5, 2005.
  42. Freiburger, G.S. and R. Zoughi’ “Forward and Reverse Reflection Coefficient Ratio from an Embedded Modulated Dipole for Dielectric Property Characterization,” Proceedings of the IEEE Instrumentation and Measurement Technology Conference (IMTC05), pp. 67-71, Ottawa, Canada, May 16-19, 2005.
  43. Ekenel, M., V. Stephen, J.J. Myers and R. Zoughi, “Microwave NDE of RC Beams Strengthened with CFRP Laminates Containing Surface Defects and Tested Under Cyclic Loading,” Proceedings of the World Conference on Nondestructive Testing (WCNDT), p. 8, Montreal, Canada, August 30-September 3, 2004.
  44. Green, G.A., P. Campbell and R. Zoughi, “An Investigation into the Potential of Microwave NDE for Maritime Application,” Proceedings of the World Conference on Nondestructive Testing (WCNDT), p. 8, Montreal, Canada, August 30-September 3, 2004.
  45. Kharkovsky, S. and R. Zoughi, “Application of Near-Field Microwave and Millimeter Wave Nondestructive Resting for Evaluation of Fiber Breakage and Orientation Evaluation in CFRP Composite Patches,” Proceedings of the Thirty First Annual Review of Progress in Quantitative Nondestructive Evaluation, vol. 24A, pp. 554-561, Golden, Co, July 25-30, 2004.
  46. Varghese, B., C. DeConick, G. Cartee, R. Zoughi, M. Velez and R. Moore, “High-Temperature Monitoring of Refractory Wall Recession Using Frequency-Modulated Continuous-Wave (FM-CW) Radar Techniques,” Proceedings of the Thirty First Annual Review of Progress in Techniques Nondestructive Evaluation, vol. 24B, pp. 1714-1720, Golden, Co, July 25-30, 2004.
  47. Hughes, D. and R. Zoughi, “Determination of the Complex Dielectric Constant of Materials using the Downhill Simplex Method with the Embedded Modulated Scattering Technique,” Proceedings of the 1st International Conference on Electromagnetic Near-Field Characterization (ICONIC 2003), pp. 86-96, Rouen, France, 18-20 June 2003.
  48. Hughes, D. and R. Zoughi, “Calculation of the Impedance of a Rectangular Waveguide Aperture in the Presence of a Loaded Dipole Antenna Embedded in a Generally Lossy Material,” Proceedings of the IEEE Instrumentation and Measurement Technology Conference (IMTC03), pp. 1126-1130, Vail, CO, May 20-22, 2003.
  49. Varghese, B., R. Zoughi, M. Velez and R. Moore, “Refractory Wall Thickness Measurement Using Time-Domain Reflectometry at Microwave Frequencies,” Proceedings of the Thirty-Ninth Symposium on Refractories, The American Ceramics Society, St. Louis, MO, April 9-10, 2003.
  50. Varghese, B., R. Zoughi, M. Velez, R. E. Moore, "Frequency Modulated Continuous Wave Monitoring of Refractory Walls," Presented at the 105th Annual Meeting of the American Ceramic Society, Nashville, Tennessee, April 27-30, 2003.
  51. Austin, R., D. Hughes, R. Zoughi, R. Engelbart and N. Wood, “Feasibility of Microwave NDI for Reducing Corrosion Repair Costs in Aging Aircraft,” Presented at the 50th DoD Working Group on NDT Conference, Portsmouth, VA, 18-21 November, 2002.
  52. Hughes, D. and R. Zoughi, “Near-Field Microwave and Embedded Modulated Scattering Techniques for Dielectric Characterization of Materials – Experimental Results,” Proceedings of the Twenty-ninth Annual Review of Progress in Quantitative Nondestructive Evaluation, vol. 22B, pp.443-448, Bellingham, WA, July 14-19, 2002.
  53. Carriveau, G. and R. Zoughi, “Nondestructive Evaluation and Characterization of Complex Composite Structures,” Proceedings of the Eleventh International Symposium on Nondestructive Characterization of Materials (Organized by Johns Hopkins University Center for Nondestructive Evaluation), pp. 273-280, Berlin, Germany, June 24- 28, 2002.
  54. Carriveau, G.,,D. Hughes, N. Qaddoumi and R. Zoughi, “Microwave Nondestructive Evaluation and Characterization of Tank Inner-Liners,” Proceedings of the Eleventh International Symposium on Nondestructive Characterization of Materials (Organized by Johns Hopkins University Center for Nondestructive Evaluation), pp. 319-324, Berlin, Germany, June 24- 28, 2002.
  55. Muñoz, K., C. Behrens, and R. Zoughi, “Potential Capabilities of Microwave NDE Methods for Interrogation of Thermal Barrier Coatings,” Proceedings of the Eleventh International Symposium on Nondestructive Characterization of Materials (Organized by Johns Hopkins University Center for Nondestructive Evaluation), pp. 309-315, Berlin, Germany, June 24- 28, 2002.
  56. Hughes, D., C. Behrens, R. Zoughi, G. Green and P. Campbell, “Investigation of the Potential of Microwave NDE for the Detection of Corrosion, Machined Defects and Impact Damage in Specially Prepared Specimens, Presented at the ASNT Spring Conference and 11th Annual Research Symposium, Portland, OR, March 18-22, 2002.
  57. Mubarak, K., K.J. Bois and R. Zoughi, “Overview and New Results of a Microwave Technique for Evaluation of Fresh Concrete Water-to-Cement Ratio (w/c),” Presented at the American Concrete Institute (ACI) Meeting, Dallas, TX, October 2001.
  58. Hughes, D., M. Kazemi, K. Marler, J. Myers, R. Zoughi and T. Nanni, “Microwave Detection of Delamination between Fiber Reinforced Polymer (FRP) Composites and Hardened Cement Paste,” Proceedings of the Twenty-eighth Annual Review of Progress in Quantitative Nondestructive Evaluation, vol. 21, pp. 512-519, Brunswick, Maine, July 29-August 3, 2001.
  59. Hughes, D. and R. Zoughi, “A Method for Evaluating the Dielectric Properties of Composites Using a Combined Embedded Modulated Scattering and Near-Field Microwave Nondestructive Testing Technique,” Proceedings of the IEEE Instrumentation and Measurement Technology Conference, pp. 1882-1886, Budapest, Hungary, May 21-23, 2001.
  60. Hughes, D., N. Wang, T. Case, K. Donnell, R. Zoughi, R. Austin and M. Novack, “Detection of Corrosion in Aluminum Panels Under Paint and Primer,” Proceedings of the Twenty-seventh Annual Review of Progress in Quantitative Nondestructive Evaluation, vol. 20A, pp. 460-466, Ames, IA, July 17-21, 2000.
  61. Qaddoumi, N., T. Bigelow, R. Zoughi, L.M. Brown and M. Novack “Removal of Standoff Distance Influence in Near-Field Microwave Inspection of Thick Stratified Composites,” Presented at the Twenty-sixth Annual Review of Progress in Quantitative Nondestructive Evaluation, Montreal, Quebec, Canada, July 25-30, 1999.
  62. Qaddoumi, N., E. Ranu, M.D. Frank, J.E. Easter, M.L. Dingus and R. Zoughi, “Microwave Inspection of Polymer Based Hoses for Interior Flaws,” Presented at the Twenty-sixth Annual Review of Progress in Quantitative Nondestructive Evaluation, Montreal, Quebec, Canada, July 25-30, 1999.
  63. Greenawald, E.C., L.J. Levenberry, N. Qaddoumi, A. McHardy, R. Zoughi and C.F. Poranski, “Microwave NDE of Impact Damaged Fiberglass and Elastomer Layered Composites,” Proceedings of the Twenty-sixth Annual Review of Progress in Quantitative Nondestructive Evaluation, vol. 19B, pp. 1263-1268, Montreal, Quebec, Canada, July 25-30, 1999.
  64. Frank, M.D., L. Handjojo, N. Qaddoumi and R. Zoughi, “Determination of Anisotropy in Glass Fibers Using Polarization of Microwave Fields,” Proceedings of the Ninth International Symposium on Nondestructive Characterization of Materials (Organized by Johns Hopkins University Center for Nondestructive Evaluation), pp. 57-62, Sydney, Australia, June 28- July 2, 1999.
  65. Handjojo, L., K. Bois and R. Zoughi, “Dielectric Property Characterization of Various Glass Specimens,” Presented at the Twenty-Fifth Annual Review of Progress in Quantitative Nondestructive Evaluation, Snowbird, UT, July 19-24, 1998.
  66. Brown, L.M., J.J. DeLoach, N. Qaddoumi and R. Zoughi, “An Overview of Microwave Inspection of Naval Multi-Layered Composites,” Proceedings of the Third Pacific Rim International Conference on Advanced Materials and Processing, Hawaii, pp. 1667-2672, July 12-16, 1998.
  67. Bray, A., K.E. Jenne, N. Qaddoumi, J. Easter, T. Bigelow and R. Zoughi, “Microwave NDE Methods for Detecting Corrosion Under Shipboard Paint,” Proceedings of the American Society of Naval Engineers Condition-Based Maintenance Symposium, Arlington, VA, June 30 - July 1, 1998.
  68. Ewald, H., R. Zoughi and N. Qaddoumi, “Der Einsatz von Wirbelstrom-und Mikowellen-Sensoren zum Nachweis Kleinster Oberflachenfehler,” Proceedings of the Tagungsanbs: 9. Symposium Maritime Elektronik, Rostock, Germany, April 15-17, 1998.
  69. Easter, J., N. Qaddoumi, R. Zoughi, L. Brown and J. DeLoach, “ Preliminary Results of Detecting and Locating Defects Under Triangular Thick Composite Structural Members,” Proceedings of the SPIE Symposium on Nondestructive Evaluation Techniques for Aging Infrastructure Manufacturing, vol. 3396, pp. 129-134, San Antonio, TX, March 1998.
  70. Qaddoumi, N., J. Easter, V. Otashevich, R. Zoughi, L. Brown, B. Bandos and J. DeLoach, “Microwave Inspection of Thick Layered Composite Deck Joints,” Presented at the Twenty Fourth Annual Review of Progress in Quantitative Nondestructive Evaluation, San Diego, CA, July 27-August 1, 1997.
  71. Qaddoumi, N. and R. Zoughi, “Application of Nonlinear Dielectric Mixing Models for Near-Field Microwave Image Analysis,” Presented at the Eighth International Symposium on Nondestructive Characterization of Materials, Boulder, CO, June 15-20, 1997.
  72. Brown, L.M., J.J. DeLoach, R. Zoughi and E. Ranu, “Preliminary Evaluation of Microwave Techniques for Inspection of Thick Layered Composite Deck Joint,” Proceedings of The Eighth International Symposium on Nondestructive Characterization of Materials, vol. VIII, pp. 305-310, Boulder, CO, June 15-20, 1997.
  73. Qaddoumi, N. and R. Zoughi, “Microwave Detection of Corrosion Under Paint and Composite Laminate Coatings,” Proceedings of SPIE Symposium, Nondestructive Evaluation Techniques for Aging Infrastructure & Manufacturing Conferences, vol. 2945, pp. 346-352, Scottsdale, AZ, December 2-5, 1996.
  74. Peterson, M, D. Maas, C. Mittlestadt, S. Srinath and R. Zoughi, “Preliminary Results for a Multi-Sensor Non-Destructive Test of Timber Strength,” Proceedings of the Review of Progress in Quantitative NDE, vol. 16B, pp. 1931-1936, Plenum Press, NY, 1997.
  75. Gray, S. and R. Zoughi, “Very High Resolution Detection of Sheet Thickness Variations and Disbond Detection,” ASNT Spring’96 Conference Paper Summaries, pp. 195-197, Norfolk, VA, March 18-22, 1996.
  76. Qaddoumi, N., S. Ganchev, R. Zoughi and G.W. Carriveau, “Microwave Non-Contact Detection and Depth Determination of Disbonds in Low Permittivity and Low Loss Sandwich Composites,” Proceedings of the Review of Progress in Quantitative NDE, vol. 15A, pp. 687- 692, Plenum Press, NY, 1995.
  77. Qaddoumi, N., S. Ganchev and R. Zoughi, “Microwave Dielectric Characterization of Low Density Glass Fibers with Resin Binder,” Proceedings of the Seventh International Symposium on Nondestructive Characterization of Materials, vol. 210-213, part 2, pp. 657-664, Prague, Czech Republic, June 19-23, 1995.
  78. Zoughi, R., S. Ganchev and G. Carriveau, “Overview of Microwave NDE Applied to Thick Composites,” Proceedings of the Seventh International Symposium on Nondestructive Characterization of Materials, vol. 210-213, part 1, pp. 69-75, Prague, Czech Republic, June 19-23, 1995. Invited Paper.
  79. Zoughi, R., S. Ganchev, G. Carriveau and N. Qaddoumi, “Microwave Detection of Defects in Thick Multi-Laminate Sandwich Composite Structures,” ASNT Spring'95 Conference Paper Summaries , pp. 191-193, Las Vegas, NV, March 20-24, 1995.
  80. Zoughi, R. and S. Gray, “Microwave/Millimeter Wave Ultra High Resolution Dielectric Slab and Disbond Thickness Measurement,” ASNT Spring'95 Conference Paper Summaries, pp. 188-190, Las Vegas, NV, March 20-24, 1995.
  81. Zoughi, R., S. Ganchev and G. Carriveau, “Microwave Nondestructive Testing: Narrow Disbond Detection and Adhesive Thickness and Composition Monitoring,” Proceedings of the Joint Army-Navy-NASA-Air Force (JANNAF) Nondestructive Evaluation Subcommittee and Structures and Mechanical Behavior Subcommittee Meeting, pp. 69-75, Hill AFB, Utah, October 24-28, 1994.
  82. Zoughi, R. and S. Ganchev, “Application of Microwave Nondestructive Techniques to Thick Composites,” Proceedings of the Nondestructive Evaluation Applied to Process Control of Composite Fabrication Conference, Paper #6, p. 13, St. Louis, MO, October 4-5, 1994.
  83. Zoughi, R., S. Ganchev and G. Carriveau, “Microwave Nondestructive Testing and Evaluation of Thick Composites,” Gordon Research Conference on Nondestructive Evaluation: "Noninvasive Sensing of Materials During Processing", Henniker, New Hampshire, June 26-July 1, 1994.
  84. Ganchev, S., N. Qaddoumi and R. Zoughi, “Detection Optimization of Disbond in Layered Composites with Varying Thicknesses Using an Open-Ended Rectangular Waveguide,” Proceedings of the Conference on Precision Electromagnetic Measurements, pp. 69-70, Boulder, CO, June 27-July 1, 1994.
  85. Radford, D.W., B.W. Barber, S. Ganchev and R. Zoughi, “Microwave Nondestructive  Evaluation of Glass Fiber/Epoxy Composites Subjected to Impact Fatigue,” Proceedings of SPIE Symposium, Advanced Microwave and Millimeter Wave Detectors Conference, vol. 2275, pp. 21-26, San Diego CA, July 24-29, 1994.
  86. Zoughi, R., “Disbond Detection and Evaluation in Multi-Layered Composite Media,” Presented at the ASNT Fall'92 Conference, Chicago, IL, November 16-20, 1992.
  87. Zoughi, R. and N. Qaddoumi, “Microwave Scattering Properties of Dielectric Cylinders with Defects,” Proceedings of the Review of Progress in Quantitative NDE, vol. 11A, pp. 515-520, Plenum Press, NY, 1992.
  88. Zoughi, R. and B. Zonnefeld, “Permittivity Characteristics of Kevlar, Carbon Composites, Fiberglass and Rubber (33% Carbon) at X-band (8-12 GHz),” Proceedings of the Review of Progress in Quantitative NDE, vol. 10B, pp. 1431-1436, Plenum Press, NY, 1991.
  89. Zoughi, R., “Review of Nondestructive Testing (NDT) Techniques at Radio and Microwave Frequencies,” Proceedings of the Review of Progress in Quantitative NDE, vol. 8A, pp. 337-344, Plenum Press, NY, 1989.

 

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