History and challenges of passive millimeter wave imaging

Pergande, Al

doi:10.1117/12.2035982

Cited by 4 publications

(4 citation statements)

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“…As can be seen from Fig. 4, the visible image shows edges and textures, while the concealed metallic object can be detected as a bright region in the millimetre image [25]. The sum of squared grey‐levels is an indication of the image energy.…”

Section: Proposed Fusion Methodsmentioning

confidence: 99%

Image fusion based on multi‐scale transform and sparse representation: an image energy approach

Fakhari

Mosavi

Lajvardi

2017

IET Image Processing

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Section: Proposed Fusion Methodsmentioning

confidence: 99%

Image fusion based on multi‐scale transform and sparse representation: an image energy approach

Fakhari

Mosavi

Lajvardi

2017

IET Image Processing

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“…Passive mm-wave units also exists [1][2]. This technology is however bulky and typically slow precluding its wide dissemination.…”

Section: Introductionmentioning

confidence: 98%

“…Millimeter waves exhibit high transmissivity through various materials and for a given material show large penetration depth [1][2][3]. This is a strong advantage in terms of capabilities for remote security applications.…”

Section: Introductionmentioning

confidence: 99%

Reflection imaging in the millimeter-wave range using a video-rate terahertz camera

et al. 2016

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The ability of millimeter waves (1-10 mm, or 30-300 GHz) to penetrate through dense materials, such as leather, wool, wood and gyprock, and to also transmit over long distances due to low atmospheric absorption, makes them ideal for numerous applications, such as body scanning, building inspection and seeing in degraded visual environments. Current drawbacks of millimeter wave imaging systems are they use single detector or linear arrays that require scanning or the two dimensional arrays are bulky, often consisting of rather large antenna-couple focal plane arrays (FPAs).Previous work from INO has demonstrated the capability of its compact lightweight camera, based on a 384 x 288 microbolometer pixel FPA with custom optics for active video-rate imaging at wavelengths of 118 µm (2.54 THz), 432 µm (0.69 THz), 663 µm (0.45 THz), and 750 µm (0.4 THz). Most of the work focused on transmission imaging, as a first step, but some preliminary demonstrations of reflection imaging at these were also reported. In addition, previous work also showed that the broadband FPA remains sensitive to wavelengths at least up to 3.2 mm (94 GHz). The work presented here demonstrates the ability of the INO terahertz camera for reflection imaging at millimeter wavelengths. Snapshots taken at video rates of objects show the excellent quality of the images. In addition, a description of the imaging system that includes the terahertz camera and different millimeter sources is provided.

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“…First, millimeter-wave imagers started to be developed in 1996 when Lockheed Martin Company obtained images of weapons under clothing with a single-pixel PMMWI with 0.4 K sensitivity [6]. After this date, commercial PMMWI systems continued to be developed in various structures for security applications, remote sensing, and metrology systems [7].…”

Section: Introductionmentioning

confidence: 99%

A Compact W-Band Low-Noise Radiometry Sensor for a Single-Pixel Passive Millimeter-Wave Imager

Tekbaş

Çakır

2023

Electronics

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Recently, studies on the remote detection of dangerous objects on the person have gained importance with increased security problems. Therefore, the use of passive millimeter waves in security systems is increasing because they are harmless to health and can penetrate clothes. In this study, a compact low-noise radiometric sensor (LNRS) that can be used to view hidden objects on the person was constructed. The LNRS can be arrayed thanks to its small size and ease of use, and can be used in imaging applications thanks to the 0.24 K resolution obtained. In addition, a passive millimeter imaging system (PMMWI) was developed to obtain images with the LNRS. The PMMWI system, which is realized in a quasi-optical structure, can be used in many experimental studies thanks to its compact structure.

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History and challenges of passive millimeter wave imaging

Cited by 4 publications

References 0 publications

Image fusion based on multi‐scale transform and sparse representation: an image energy approach

Image fusion based on multi‐scale transform and sparse representation: an image energy approach

Reflection imaging in the millimeter-wave range using a video-rate terahertz camera

A Compact W-Band Low-Noise Radiometry Sensor for a Single-Pixel Passive Millimeter-Wave Imager

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