Gabriel P. Kniffin

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One important yet commonly overlooked phenomenon in terahertz (THz) reflection spectroscopy is the etalon effect-interference caused by multiple reflections from dielectric layers. Material layers are present in many THz applications from the monitoring of pharmaceutical tablet coating thickness to the detection of drugs, explosives, or other contraband(More)
A recent publication by McCargar and Zurk [(2013). J. Acoust. Soc. Am. 133(4), EL320-EL325] introduced a modified Fourier transform-based method for passive source depth estimation using vertical line arrays deployed below the critical depth in the deep ocean. This method utilizes the depth-dependent modulation caused by the interference between the direct(More)
Terahertz (THz) imaging has shown great potential for nondestructive evaluation of a wide variety of manufactured products composed of nonpolar dielectric materials. Recent work by the authors and others has demonstrated the ability to produce three-dimensional (3-D) THz tomographic images of such objects using a single dataset collected in a 2-D synthetic(More)
Terahertz (THz) and metamaterials are both hot topics in electromagnetics research. The THz band (0.1-10 THz) lies in the ‘gap’ between microwave and far infrared regions. Research is currently underway to characterize how these waves interact with matter, with potential applications including security screening, medical imaging, and non-destructive(More)
3-D imaging at terahertz (THz) frequencies provides a capability for a number of applications, such as explosives detection and non-destructive evaluation. Many current 3-D techniques require mechanical scanning, and often lack spectral resolution required for chemical detection. In this paper, 3-D broadband synthetic aperture imaging techniques are(More)
Terahertz (THz) imaging has shown great potential for nondestructive evaluation (NDE) of a wide variety of manufactured products. Its ability to penetrate many non-polar dielectrics allows tomographic imaging of an object's 3D structure. The authors' previous work demonstrated the ability to produce 3D THz tomographic images of objects using a single data(More)
Terahertz (THz) non-destructive evaluation (NDE) has shown great promise for applications in manufacturing, security screening, and medical imaging. However, interpretation of the THz A-scans is complicated by a number of factors. Other researchers have applied signal processing techniques that improve object boundary detection, but still rely on human(More)
Terahertz (THz) technology has shown great promise for non-destructive evaluation (NDE) applications in manufacturing, security screening, and medical imaging. This work expands the scope of THz NDE, demonstrating its use as a new and innovative method for NDE of nylon ropes and slings. The strength of ropes and slings is compromised when grains of sand or(More)
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