THz Active Imaging Systems With Real-Time Capabilities

Friederich, Fabian; Spiegel, Wolff von; Bauer, Maris; Meng, Fanqi; Thomson, Mark D.; Boppel, Sebastian; Lisauskas, Alvydas; Hils, B.; Krozer, Viktor; Keil, Andreas; Löffler, Thomas; Henneberger, R.; Huhn, A. K.; Spickermann, Gunnar; Bolívar, P. Haring; Roskos, Hartmut G.

doi:10.1109/tthz.2011.2159559

Cited by 191 publications

(59 citation statements)

References 76 publications

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“…Other radars in the 300-340 GHz range have also been reported by groups in Israel [5], [6] and Spain [7]. Researchers in Germany have developed radars operating around 300 GHz and near 650 GHz [8], [9], where the next-higher atmospheric transmission window lies. Those efforts explored nondestructive material characterization as well as concealed object detection using both real and synthetic aperture techniques [10], and steps have even been taken toward building a radar operating above 800 GHz [11].…”

Section: Submm-wave Radar Worldwidementioning

confidence: 85%

“…This high-power requirement is fundamentally incompatible with solid-state THz electronics, where typically around 10 mW can be generated by a single Schottky diode frequency multiplier at 300 GHz, falling to about 100 uW by 1 THz and 10 uW at 3 THz [28]. Andrew's 340-GHz, 10-Hz frame-rate, 20-m standoff imaging radar system with representative snapshots of a person's head and shoulders [3]; (c) the Synview 650-GHz imaging radar along with a three-dimensional (3-D) reconstruction of a person's hand [8], [9]; and (d) a scaled model radar testing using a 1.56-THz imaging radar with a radiation source from laser mixing [12]. Figures reprinted with permission.…”

Section: Submm-wave Radar Rf Architecturementioning

confidence: 99%

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Submillimeter-Wave Radar: Solid-State System Design and Applications

Cooper

Chattopadhyay

2014

IEEE Microwave

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Section: Submm-wave Radar Worldwidementioning

confidence: 85%

Section: Submm-wave Radar Rf Architecturementioning

confidence: 99%

Submillimeter-Wave Radar: Solid-State System Design and Applications

Cooper

Chattopadhyay

2014

IEEE Microwave

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“…Compared to the incoherent fully-intensity-based detection (e.g., [8], [9]) where the incident THz wave undergoes a self-mixing, in a heterodyne receiver (not implemented in this work) it is mixed with an LO signal with much larger power. The output response, as well as the imaging sensitivity, are therefore greatly enhanced [30]. A heterodyne multi-pixel system also enables electronic beam scanning, because each receiver pixel preserves the phase of the incident THz wave, and the signal phase shifting/combining can be then performed in the digital domain.…”

Section: Design Of a 320 Ghz Transmittermentioning

confidence: 99%

A SiGe Terahertz Heterodyne Imaging Transmitter With 3.3 mW Radiated Power and Fully-Integrated Phase-Locked Loop

Han

Jiang

Mostajeran

et al. 2015

IEEE J. Solid-State Circuits

138

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A high-power 320 GHz transmitter using 130 nm SiGe BiCMOS technology ( 220/280 GHz) is reported. This transmitter consists of a 4 × 4 array of radiators based on coupled harmonic oscillators. By incorporating a signal filter structure called return-path gap coupler into a differential self-feeding oscillator, the proposed 320 GHz radiator simultaneously maximizes the fundamental oscillation power, harmonic generation, as well as on-chip radiation. To facilitate the TX-RX synchronization of a future terahertz (THz) heterodyne imaging chipset, a fully-integrated phase-locked loop (PLL) is also implemented in the transmitter. Such on-chip phase-locking capability is the first demonstration for all THz radiators in silicon. In the far-field measurement, the total radiated power and EIRP of the chip is 3.3 mW and 22.5 dBm, respectively. The transmitter consumes 610 mW DC power, which leads to a DC-to-THz radiation efficiency of 0.54%. To the authors' best knowledge, this work presents the highest radiated power and DC-to-THz radiation efficiency in silicon-based THz radiating sources.

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“…Millimeter wave and terahertz systems, which take advantage of the frequency modulation continuous wave (FMCW) method, allow for the reconstruction of depth information of transparent samples under test with the depth resolution being inversely proportional to the modulation bandwidth, as described in Section 4. While many different terahertz imaging schemes have been developed (a variety of different concepts are exemplary given in [8]), the relations between object size, wavelength, and required resolution often rise the need for custom-designed solutions. In this contribution, we report on the development of an industrial three-dimensional (3D) terahertz imaging system for radome inspection using sensor units working at 100 and 150 GHz, respectively.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Radome Inspection

et al. 2018

Self Cite

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Radomes protecting sensitive radar, navigational, and communications equipment of, e.g., aircraft, are strongly exposed to the environment and have to withstand harsh weather conditions and potential impacts. Besides their significance to the structural integrity of the radomes, it is often crucial to optimize the composite structures for best possible radio performance. Hence, there exists a significant interest in non-destructive testing techniques, which can be used for defect inspection of radomes in field use as well as for quality inspection during the manufacturing process. Contactless millimeter-wave and terahertz imaging techniques provide millimeter resolution and have the potential to address both application scenarios. We report on our development of a three-dimensional (3D) terahertz imaging system for radome inspection during industrial manufacturing processes. The system was designed for operation within a machining center for radome manufacturing. It simultaneously gathers terahertz depth information in adjacent frequency ranges, from 70 to 110 GHz and from 110 to 170 GHz by combining two frequency modulated continuous-wave terahertz sensing units into a single measurement device. Results from spiraliform image acquisition of a radome test sample demonstrate the successful integration of the measurement system.

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THz Active Imaging Systems With Real-Time Capabilities

Cited by 191 publications

References 76 publications

Submillimeter-Wave Radar: Solid-State System Design and Applications

Submillimeter-Wave Radar: Solid-State System Design and Applications

A SiGe Terahertz Heterodyne Imaging Transmitter With 3.3 mW Radiated Power and Fully-Integrated Phase-Locked Loop

Terahertz Radome Inspection

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