Terahertz near-field interferometric and synthetic aperture imaging

Walsh, Kenneth P.; Schulkin, Brian; Gary, Dale E.; Federici, John F.; Barat, Robert; Zimdars, David

doi:10.1117/12.541525

Cited by 34 publications

(25 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This configuration produces images within a wide field of view (35 degree), with a sizable depth of focus (larger than ±10% of the distance to the target), and small lateral distortions. 1,37 Recent experimental measurements of THz image reconstruction using interferemetric imaging methods compare well with theoretical predictions. 35 When is it preferable to use an interferometric imaging approach rather than a focal plane approach?…”

Section: Interferometric Imaging Versus Focal Plane Arraymentioning

confidence: 55%

THz standoff detection and imaging of explosives and weapons

et al. 2005

Self Cite

View full text Add to dashboard Cite

Recently, there has been a significant interest in employing Terahertz (THz) technology, spectroscopy and imaging for standoff detection applications. There are three prime motivations for this interest: (a) THz radiation can detect concealed weapons since many non-metallic, non-polar materials are transparent to THz radiation, (b) target compounds such as explosives, and bio/chemical weapons have characteristic THz spectra that can be used to identify these compounds and (c) THz radiation poses no health risk for scanning of people. This paper will provide an overview of THz standoff detection of explosives and weapons including discussions of effective range, spatial resolution, and other limitations.

show abstract

Section: Interferometric Imaging Versus Focal Plane Arraymentioning

confidence: 55%

THz standoff detection and imaging of explosives and weapons

et al. 2005

Self Cite

View full text Add to dashboard Cite

show abstract

“…Despite the knowledge that synthetic aperture (SA) processing leads to high resolution images, very little research exists in SA using THz radiation. Exceptions are published results related to interferometry rather than actual synthetic aperture imaging [2], [3] or small scale SA results based on THz impulse ranging [4] on reflective and opaque objects. This paper will help to fill up this research gap in two ways: by demonstrating the extension from SA(R/S) [5], [6], towards SAT and by exploring the applications reachable combining THz waves and SA imaging in the domain of NDT [7].…”

Section: Introductionmentioning

confidence: 79%

Synthetic aperture imaging extended towards novel THz sensors

2008

View full text Add to dashboard Cite

The purpose of this paper is to extend the technology of synthetic aperture (SA) imaging used in radar (SAR) and sonar (SAS) to the THz range (SAT). This novel approach in THz will be applied in the domain of non-destructive testing (NDT). The paper presents simulated SAT images which are demonstrating the performance of a synthetic aperture time domain reconstruction processing. The generated SAT target responses of broadband radiation show high resolution and high signal-to-noise ratio (SNR) which lead to an improvement of nondestructive defect identification.

show abstract

“…With the fast development of interferometry technology, there has been growing interest in applying SAIR in short range imaging applications [1] , such as security detection of concealed weapons or other contrabands, all weather surveillance and reconnaissance, and ground penetrating imaging for landmine detection or archeology. In these applications the objects are inevitably within the near field of the antenna array.…”

Section: Introductionmentioning

confidence: 99%

“…It can be classified into two types. One is based on hardware transformation [1,4] . It physically rearranges the antenna elements from planar array to circular or spherical array.…”

Section: Introductionmentioning

confidence: 99%

Focal plane approximation for near field interferometric radiometer imaging

Zhang

Liu

et al. 2010

2010 IEEE International Geoscience and Remote Sensing Symposium

View full text Add to dashboard Cite

Applying synthetic aperture interferometric radiometer (SAIR) in near field imaging has been receiving great interest in the recent years. Because the traditional far-field Fourier imaging theory is not valid in near-field condition, developing the proper near-field imaging techniques is the major desirable objective of near field SAIR applications. This work is devoted to establish an effective near field imaging method still with traditional far-field plane antenna array. The discrete numerical inversion method with focal plane approximation is developed. The regularization method is also introduced to deal with the ill condition and measurement errors.

show abstract

Terahertz near-field interferometric and synthetic aperture imaging

Cited by 34 publications

References 2 publications

THz standoff detection and imaging of explosives and weapons

THz standoff detection and imaging of explosives and weapons

Synthetic aperture imaging extended towards novel THz sensors

Focal plane approximation for near field interferometric radiometer imaging

Contact Info

Product

Resources

About