Compact fiber-pigtailed terahertz imaging system

Rudd, J. V.; Zimdars, David; Warmuth, Matthew W.

doi:10.1117/12.386344

Cited by 58 publications

(24 citation statements)

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“…1Q6 -|o 9 10 12 10 15 10 18 10 21 Research interest in T-rays stems from the broadband pulsed nature of the radiation and the THz-frequency response of materials, ranging from semiconductors to human tissue. The wavelength of the radiation corresponds to a photon energy, and thus to certain energy transitions in materials.…”

Section: Introductionmentioning

confidence: 99%

“…The first, using photoconductive antennas, was developed at Bell Labs and the IBM Watson Research Center and is now available in a commercial product from Picometrix Inc, MI. 9 The second, using the nonlinear effects of optical rectification and electro-optic sampling, is marketed by Zomega Technology Corp, NY. 10 Large-scale stand-alone imaging systems became available in 2002 from TeraView 11 and Nikon.…”

Section: Introductionmentioning

confidence: 99%

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T-Ray Sensing and Imaging

Mickan

Zhang

2003

Int. J. Hi. Spe. Ele. Syst.

110

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Terahertz (THz) radiation occupies part of the electromagnetic spectrum between the infrared and microwave bands. Until recently, technology at THz frequencies was underdeveloped compared to the rest of the electromagnetic spectrum, leaving a gap between millimeter waves and the far-infrared (FIR). In the past decade, interest in the THz gap has been increased by the development of ultrafast laser-based T-ray systems and their demonstration of diffraction-limited spatial resolution, picosecond temporal resolution, DC-THz spectral bandwidth and signal-to-noise ratios above 10 4 . This chapter reviews the development, the state of the art and the applications of T-ray spectrometers. Continuous-wave (CW) THz-frequency sources and detectors are briefly introduced in comparison to ultrafast pulsed THz systems. An emphasis is placed on experimental applications of T-rays to sensing and imaging, with a view to the continuing advance of technologies and applications in the THz band.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

T-Ray Sensing and Imaging

Mickan

Zhang

2003

Int. J. Hi. Spe. Ele. Syst.

110

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“…Two slightly different experimental configurations, both based on a commercially available fiber coupled terahertz time domain spectrometer [15] are employed. The spectrometer consists of a diode pumped femtosecond laser which generates 80 fs laser pulses.…”

Section: Experimental Setup and Measurementsmentioning

confidence: 99%

The Impact of Reflections From Stratified Building Materials on the Wave Propagation in Future Indoor Terahertz Communication Systems

Jansen

Piesiewicz

Mittleman

et al. 2008

IEEE Trans. Antennas Propagat.

115

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In order to derive reliable propagation models for future terahertz indoor pico-cellular communication systems, accurate reflectivity data of building materials is necessary. Here we present reflection terahertz time domain spectroscopy (THz-TDS) measurements and matching transfer matrix simulations of the frequency dependent reflection coefficient of multi layer building materials in the frequency range from 100 to 500 GHz for a set of angles, both in TE-and TM-polarization. Two prominent stratified structures, a double pane window and white paint on plaster are investigated as they usually account for large areas in indoor environments. Communication systems located above 100 GHz are expected to be strongly affected by the variations of the reflectivity over the frequency and incident angle of such stratified materials as they will rely both on line of sight (LOS) and non line of sight (NLOS) propagation. We discuss this impact on the power distribution in a sample scenario employing the ray-tracing method.

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“…Terahertz (THz or T-Ray) imaging is being adopted for non-destructive evaluation (NDE) applications in aerospace and other government and industrial settings [1][2][3]. NASA is currently employing THz reflection NDE to examine the space shuttle external tank sprayed on foam insulation (SOFI) for voids and disbonds.…”

Section: Introductionmentioning

confidence: 99%

Terahertz imaging

Zimdars¹

2007

2007 Quantum Electronics and Laser Science Conference

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The methods, instrumentation, and application of time domain terahertz imaging (a.k.a. THz or T-Ray Imaging) for non-destructive evaluation (NDE) and security are discussed. IntroductionTerahertz (THz or T-Ray) imaging is being adopted for non-destructive evaluation (NDE) applications in aerospace and other government and industrial settings [1][2][3]. NASA is currently employing THz reflection NDE to examine the space shuttle external tank sprayed on foam insulation (SOFI) for voids and disbonds. Homeland security applications such as the inspection of personnel[2], the detection of concealed explosives[2], biological agents, chemical weapons, flammables, metallic and non-metallic weapons are the subject of active investigation. We report the development and applications of a high speed large area time domain terahertz non destructive evaluation imaging systems such as the Picometrix QA1000 T-Ray non-destructive evaluation (NDE) imager. Instrumentation and ApplicationsAs an example of one application being developed, we demonstrate the location and identification of delaminations and water intrusion in advanced composite materials used in ground based radome panels, shelters and towers using T-Ray imaging. Radomes encase radar antennae in order to protect them from them from wind, rain, snow, hail, dust or other interference which could damage the radar or hinder its operation. Radome composite panels are typically sandwich type structures of dielectric materials, for example woven material (fiberglass, GORE) surface layers and a foam or honeycomb core. Exposure to the elements can damage the radome, leading to dela minations an water intrusion which degrade radar performance. We have used the QA1000 T-Ray imager to demonstrate detection of dela mination and water intrusion, Figure 1. Water is much more absorptive than the inner core foam, and water intrusion is indicated by a dark shadowing in the back surface reflection. The method is non-contact with a working distance of 30 cm. demonstrated, and has millimeter lateral resolution which finely locates the features and defects within the panels. Additional applications in aerospace NDE and security imaging will be discussed.

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Compact fiber-pigtailed terahertz imaging system

Cited by 58 publications

References 1 publication

T-Ray Sensing and Imaging

T-Ray Sensing and Imaging

The Impact of Reflections From Stratified Building Materials on the Wave Propagation in Future Indoor Terahertz Communication Systems

Terahertz imaging

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