Frank L. 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

Sergey Kharkovsky, Reza Zoughi, Joseph T. Case, 2006 .

Nondestructive testing of the space shuttle external tank foam insulation using near field and focused millimeter wave techniques

Sergey Kharkovsky, Reza Zoughi, James L. Walker, 2005 .

Microwave and Millimeter Wave Nondestructive Testing of the Space Shuttle External Tank Insulating Foam

Sergey Kharkovsky, Reza Zoughi, Frank L. Hepburn, 2005 .

SOURCES OF AND REMEDIES FOR REMOVING UNWANTED REFLECTIONS IN MILLIMETER WAVE IMAGES OF COMPLEX SOFI‐COVERED SPACE SHUTTLE STRUCTURES

Sergey Kharkovsky, Reza Zoughi, Frank L. Hepburn, 2008 .

High resolution millimeter wave imaging of space shuttle external fuel tank spray-on foam insulation

Sergey Kharkovsky, Reza Zoughi, Frank L. Hepburn, 2007 .

High Resolution Millimeter Wave Detection of Vertical Cracks in the Space Shuttle External Tank Spray‐on‐Foam Insulation (SOFI)

Sergey Kharkovsky, Reza Zoughi, Frank L. Hepburn, 2006 .

Millimeter-wave detection of localized anomalies in the space shuttle external fuel tank insulating foam

Mohamed Ahmed Abou-Khousa, Sergey Kharkovsky, Reza Zoughi, 2013, IEEE Transactions on Instrumentation and Measurement.

High-Resolution Inspection of the Space Shuttle External Tank Spray-on-Foam Insulation (SOFI) using Focused Millimeter Waves at D-Band (150 GHz)

Sergey Kharkovsky, Reza Zoughi, Frank L. Hepburn, 2006 .

MILLIMETER WAVE HOLOGRAPHICAL INSPECTION OF HONEYCOMB COMPOSITES

Sergey Kharkovsky, Reza Zoughi, Gary Steffes, 2008 .