Active Millimeter-Wave Radiometry for Nondestructive Testing/Evaluation of Composites—Glass Fiber Reinforced Polymer

Viegas, Colin; Alderman, Byron; Huggard, P. G.; Powell, Jeff R.; Parow-Souchon, Kai; Firdaus, Muhammad; Liu, Hairui; Duff, Christopher I.; Sloan, R.

doi:10.1109/tmtt.2016.2625785

Cited by 23 publications

(12 citation statements)

References 26 publications

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“…Besides, other microwave NDT methods also reported in detecting the defects under GFRP insulation. In [20]- [22], a millimeter-wave active radiometer based on transmission measurement is used to detect and measure the delamination in GFRP. In the active thermographic method reported in [23], [24], the GFRP sample is illuminated with a waveguide and the differential temperature change is detected using a thermal camera.…”

Section: Several Microwave Ndt Techniques Have Been Reported For Undementioning

confidence: 99%

Microwave Nondestructive Testing for Defect Detection in Composites Based on K-Means Clustering Algorithm

et al. 2021

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Section: Several Microwave Ndt Techniques Have Been Reported For Undementioning

confidence: 99%

Microwave Nondestructive Testing for Defect Detection in Composites Based on K-Means Clustering Algorithm

et al. 2021

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“…Besides, the photon energy of THz waves is much lower than the familiar X-ray, causing nearly no harm to human bodies. The above advantages show the great potential of THz imaging and sensing in plenty of applications [2], including public security detection [3][4][5][6][7][8][9][10][11][12][13][14][15][16], radar imaging [17][18][19][20][21][22][23][24][25][26][27], non-destructive inspection [28,29], and biomedical testing [30].…”

Section: Introductionmentioning

confidence: 99%

Adaptive 3D Imaging for Moving Targets Based on a SIMO InISAR Imaging System in 0.2 THz Band

et al. 2021

Remote Sensing

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Terahertz (THz) imaging technology has received increased attention in recent years and has been widely applied, whereas the three-dimensional (3D) imaging for moving targets remains to be solved. In this paper, an adaptive 3D imaging scheme is proposed based on a single input and multi-output (SIMO) interferometric inverse synthetic aperture radar (InISAR) imaging system to achieve 3D images of moving targets in THz band. With a specially designed SIMO antenna array, the angular information of the targets can be determined using the phase response difference in different receiving channels, which then enables accurate tracking by adaptively adjusting the antenna beam direction. On the basis of stable tracking, the high-resolution imaging can be achieved. A combined motion compensation method is proposed to produce well-focused and coherent inverse synthetic aperture radar (ISAR) images from different channels, based on which the interferometric imaging is performed, thus forming the 3D imaging results. Lastly, proof-of-principle experiments were performed with a 0.2 THz SIMO imaging system, verifying the effectiveness of the proposed scheme. Non-cooperative moving targets were accurately tracked and the 3D images obtained clearly identify the targets. Moreover, the dynamic imaging results of the moving targets were achieved. The promising results demonstrate the superiority of the proposed scheme over the existing THz imaging systems in realizing 3D imaging for moving targets. The proposed scheme shows great potential in detecting and monitoring moving targets with non-cooperative movement, including unmanned military vehicles and space debris.

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“…Diode technology at mmWave frequencies and above, aims to minimise parasitic circuit elements which degrade the high frequency performance 17 . There is significant interest in the use of novel diode technologies, such as those based on Gallium Arsenide (GaAs) air-bridged Schottky configurations, which are designed to remove significant parasitic elements that limit high frequency performance 18 . Applications of this class of GaAs Schottky diodes are found in mixers and frequency multipliers at submillimetre frequencies for use in test equipment, scientific experimentation, security and communication system components up to and beyond 300 GHz 19 , 20 .…”

Section: Introductionmentioning

confidence: 99%

Air-bridged Schottky diodes for dynamically tunable millimeter-wave metamaterial phase shifters

Vassos

Churm

Powell

et al. 2021

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A low loss metamaterial unit cell is presented with an integrated GaAs air-bridged Schottky diode to produce a dynamically tunable reflective phase shifter that is capable of up to 250° phase shift with an experimentally measured average loss of 6.2 dB at V-band. The air-bridged Schottky diode provides a tuneable capacitance in the range between 30 and 50 fF under an applied reverse voltage bias. This can be used to alter the resonant frequency and phase response of a split patch unit cell of a periodic metasurface. The air-bridged diode die, which is flip-chip soldered to the patch, has ultra-low parasitic capacitance and resistance. Simulated and measured results are presented which verify the potential for the attainment of diode switching speeds with acceptable losses at mmWave frequencies. Furthermore the study shows that this diode-based unit cell can be integrated into metamaterial components, which have potential applications in future mmWave antenna beam-steering, intelligent reflecting surfaces for 6G communications, reflect-arrays, transmit-arrays or holographic antennas.

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Active Millimeter-Wave Radiometry for Nondestructive Testing/Evaluation of Composites—Glass Fiber Reinforced Polymer

Cited by 23 publications

References 26 publications

Microwave Nondestructive Testing for Defect Detection in Composites Based on K-Means Clustering Algorithm

Microwave Nondestructive Testing for Defect Detection in Composites Based on K-Means Clustering Algorithm

Adaptive 3D Imaging for Moving Targets Based on a SIMO InISAR Imaging System in 0.2 THz Band

Air-bridged Schottky diodes for dynamically tunable millimeter-wave metamaterial phase shifters

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