W-Band Chirp Radar Mock-Up Using a Glow Discharge Detector

Rozban, Daniel; Akram, A.; Levanon, Assaf; Abramovich, Amir; Kopeika, Norman S.

doi:10.1109/jsen.2012.2233733

Cited by 27 publications

(18 citation statements)

References 15 publications

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“…Application based MMW, as described above are well needed. Previous works of using very inexpensive Glow Discharge Detectors (GDD) in W-band were performed and presented [6][7][8][9][10][11][12][13][14][15]. The GDD is a low-pressure miniature neon indicator lamp.…”

Section: Introductionmentioning

confidence: 99%

“…The advantages of the GDD were described in detail in [12]. In the last few years small GDD arrays such as 8 × 8 FPA and an 18 × 2 scanner have been developed and tested, and found to yield very good MMW image quality despite the large size and dimensions of the lamps [12][13][14][15]. Recent results include the use of oversampling sub-pixel shifting to obtain high resolution images [12] on the order of 0.9 milliradians in special circumstances.…”

Section: Introductionmentioning

confidence: 99%

“…Lack of uniformity is caused by GDD inconsistent power detection, arising from the fact that the GDD lamp devices are manufactured as inexpensive indicator lamps rather than MMW radiation detectors. Developing a calibration technique for those needs was performed [13], and produced satisfactory image quality. GDD heterodyne detection capability mechanism was described and published for 10 KHz [14] and 300 GHz radiation [15].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Feasibility of Radon projection acquisition for compressive imaging in MMW region based new video rate 16×16 GDD FPA camera

Levanon

Konstantinovsky

Kopeika

et al. 2015

Passive and Active Millimeter-Wave Imaging XVIII

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In this article we present preliminary results for the combination of two interesting fields in the last few years: 1) Compressed imaging (CI), which is a joint sensing and compressing process, that attempts to exploit the large redundancy in typical images in order to capture fewer samples than usual. 2) Millimeter Waves (MMW) imaging. MMW based imaging systems are required for a large variety of applications in many growing fields such as medical treatments, homeland security, concealed weapon detection, and space technology. Moreover, the possibility to create a reliable imaging in low visibility conditions such as heavy cloud, smoke, fog and sandstorms in the MMW region, generate high interest from military groups in order to be ready for new combat. The lack of inexpensive room temperature imaging sensors makes it difficult to provide a suitable MMW system for many of the above applications. A system based on Glow Discharge Detector (GDD) Focal Plane Arrays (FPA) can be very efficient in real timeimaging with significant results. The GDD is located in free space and it can detect MMW radiation almost isotropically. In this article, we present a new approach of reconstruction MMW imaging by rotation scanning of the target. The Collection process here, based on Radon projections allows implementation of the compressive sensing principles into the MMW region. Feasibility of concept was obtained as radon line imaging results. MMW imaging results with our resent sensor are also presented for the first time. The multiplexing frame rate of 16x16 GDD FPA permits real time video rate imaging of 30 frames per second and comprehensive MMW imaging. It uses commercial GDD lamps with diameter, Ne indicator lamps as pixel detectors. Combination of these two fields should make significant improvement in MMW region imaging research, and new various of possibilities in compressing sensing technique.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Feasibility of Radon projection acquisition for compressive imaging in MMW region based new video rate 16×16 GDD FPA camera

Levanon

Konstantinovsky

Kopeika

et al. 2015

Passive and Active Millimeter-Wave Imaging XVIII

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“…Moreover, applications involving sandstorms generate high interest from military groups in order to be ready for new desert combat. FMCW radar detection can enhance the information provided by the system since the image received also contains the distance to the target [4]. FMCW advantages and disadvantages are described briefly in [4], and the two methods, FMCW and direct detection, are compared.…”

Section: Introductionmentioning

confidence: 99%

Capability of long distance 100 GHz FMCW using a single GDD lamp sensor

et al. 2014

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Millimeter wave (MMW)-based imaging systems are required for applications in medicine, homeland security, concealed weapon detection, and space technology. The lack of inexpensive room temperature imaging sensors makes it difficult to provide a suitable MMW system for many of the above applications. A 3D MMW imaging system based on chirp radar was studied previously using a scanning imaging system of a single detector. The radar system requires that the millimeter wave detector will be able to operate as a heterodyne detector. Since the source of radiation is a frequency modulated continuous wave (FMCW), the detected signal as a result of heterodyne detection gives the object's depth information according to value of difference frequency, in addition to the reflectance of the 2D image. New experiments show the capability of long distance FMCW detection by using a large scale Cassegrain projection system, described first (to our knowledge) in this paper. The system presents the capability to employ a long distance of at least 20 m with a low-cost plasma-based glow discharge detector (GDD) focal plane array (FPA). Each point on the object corresponds to a point in the image and includes the distance information. This will enable relatively inexpensive 3D MMW imaging.

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“…The high cost, complicated production processes, and alignment difficulties call for the development of low-cost MMW components for quasi-optical and imaging systems [2] . A good example of such a component is the glow discharge detector, which is a very inexpensive detector for MMW imaging systems that costs about $0.30 [3][4][5] . On the other hand, the imaging mirror is very expensive and very difficult to align due to its weight and large aperture.…”

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confidence: 99%

Flat mirror for millimeter-wave and terahertz imaging systems using an inexpensive metasurface

2017

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Flat mirrors, also known as flat parabolic surfaces, for millimeter-wave and terahertz imaging systems are demonstrated. This flat mirror is based on the metasurface in which an inexpensive printed circuit board technology is used to realize copper patterns printed on an FR4 substrate. Compared to the conventional reflector antennas used today in diverse applications (for homeland security, medical systems, communication, etc.), the suggested mirror has major advantages in process simplicity, mechanical flexibility, frequency alignment, weight, and cost. The theoretical background, simulation results, experimental results, and proof of concept are given in this Letter. OCIS codes: 110.6795, 160.3918, 230.4040, 240.6700. doi: 10.3788/COL201715.011101.In recent years, the use of millimeter-wave (MMW) applications (for homeland security, communication, medicine, etc.) has grown significantly, especially in the case of applications based on imaging systems [1] . The lack of quasioptical components for the 30-300 GHz frequency range, such as large-aperture mirrors and inexpensive detectors and sources, is noticeable. The high cost, complicated production processes, and alignment difficulties call for the development of low-cost MMW components for quasi-optical and imaging systems [2] . A good example of such a component is the glow discharge detector, which is a very inexpensive detector for MMW imaging systems that costs about $0.30 [3][4][5] . On the other hand, the imaging mirror is very expensive and very difficult to align due to its weight and large aperture. Mirrors with large apertures equal to 500 mm and greater are required for proper MMW image quality and maintenance of the focal point generally close to its diffraction limit [6] . In this Letter, we will present an alternative imaging mirror design based on a planar surface for MMW imaging, which is very inexpensive and lightweight and is known as a flat parabolic surface (FLAPS) [7] . This FLAPS design is based on an array of variabledimension metal cells (a metasurface), which are connected to the ground plane through a dielectric substrate. This unique structure is a particular case of two-dimensional (2D) metamaterial called a metasurface [8] . The dielectric constants of the substrate and size of each metal cell determine its electrical characteristics, such as capacitance and inductance, as well as its electromagnetic properties [9] . MMW radiation incident to the FLAPS mirror surface causes currents to flow from the top surface of the dipoles to the ground plane through a passive array of capacitors and inductors, which cause a phase shift in the reflected electromagnetic wave (see Fig. 1). By varying the size of a dipole, we basically vary its phase shift, depending on its location on the FLAPS mirror surface (see Fig. 1). In this study, the metasurface mirror structure was composed of an FR4 (glass epoxy) dielectric substrate with a ground plane in the back and printed metal patterns on the front. Each metal cell on the front is connected to the...

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W-Band Chirp Radar Mock-Up Using a Glow Discharge Detector

Cited by 27 publications

References 15 publications

Feasibility of Radon projection acquisition for compressive imaging in MMW region based new video rate 16×16 GDD FPA camera

Feasibility of Radon projection acquisition for compressive imaging in MMW region based new video rate 16×16 GDD FPA camera

Capability of long distance 100 GHz FMCW using a single GDD lamp sensor

Flat mirror for millimeter-wave and terahertz imaging systems using an inexpensive metasurface

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