Holographic subsurface radar for diagnostics of cryogenic fuel tank thermal insulation of space vehicles

Ivashov, Sergey; Razevig, Vladimir; Vasiliev, I.; Bechtel, Timothy; Capineri, Lorenzo

doi:10.1016/j.ndteint.2014.10.002

“…While the RASCAN-5 model records complex microwave holographic interference patterns of subsurface objects (which are then suitable for reconstruction), in many cases the recorded holograms resemble the actual subsurface target form due to the electromagnetic properties of typical lossy media suppressing the outer fringes or rings of the interference pattern [8]. However, in transparent media, it is possible to significantly improve the resolution of the microwave images using a hologram reconstruction algorithm [21], [50], [66], [67], [69]. Fig.…”

Section: Reconstruction Of Subsurface Radar Hologramsmentioning

confidence: 99%

Design and Applications of Multi-Frequency Holographic Subsurface Radar: Review and Case Histories

Ivashov¹,

Capineri²,

Bechtel³

et al. 2021

Preprint

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Holographic subsurface radar (HSR) is currently not in widespread usage. This is due to an historical perspective in the ground penetrating radar (GPR) community that the high attenuation of electromagnetic waves in most media of interest, and the inability to apply time-varying gain to the continuous wave (CW) HSR signal precludes sufficient effective penetration depth. While it is true that the fundamental physics of HSR, with its use of a CW signal, does not allow amplification of later (i.e. deeper) arrivals in lossy media (as is possible with impulse subsurface radar — ISR), HSR has distinct some distinctive advantages. The most important of these is the ability to do shallow subsurface imaging with a resolution that is not possible with ISR. In addition, the design of an HSR system is simpler than for ISR due to the relatively low-tech transmitting and receiving antennae. This paper provides a review of the main principles of HSR through an optical analogy and describes possible algorithms for radar hologram reconstruction. We also present a review of the history of development of systems and applications for HSR of the “RASCAN” type which is possibly the only holographic subsurface radar that is produced in lots. Among the subsurface imaging and remote sensing applications considered are humanitarian demining, construction inspection, surveys of historic architecture and artworks, nondestructive testing of dielectric aerospace materials, security applications, paleontology, detection of wood-boring insect damage, and others. Each application is illustrated with relevant data acquired in laboratory and/or field experiments.

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“…In the event that the attenuation of the medium and the characteristics of the antenna reduce (or ideally cancel) the external fringes of the interference pattern [8], and then the holographic image will be a good reproduction of the shape of the object itself. Furthermore, in the case of microwave transparent propagation media, hologram reconstruction algorithms can be adopted [21], [50], [66], [67], [69]. With these elaborations, it is possible to improve the resolution of the microwave images at different depths of investigation.…”

Section: Reconstruction Of Subsurface Radar Hologramsmentioning

confidence: 99%

“…The RASCAN-5 radar was used for diagnostic experiments on composite details [67], [68], [106]. However, these experiments showed insufficient sensitivity to small and low-contrast defects due to low operating frequencies and inaccurate positioning during manual scanning.…”

Section: Non-destructive Testing Of Building Structures and Composite Materialsmentioning

confidence: 99%

Design and Applications of Multi-Frequency Holographic Subsurface Radar: Review and Case Histories

Ivashov¹,

Capineri²,

Bechtel³

et al. 2021

Preprint

1

0

View full text Add to dashboard Cite

Holographic subsurface radar (HSR) is currently not in widespread usage. This is due to an historical perspective in the ground penetrating radar (GPR) community that the high attenuation of electromagnetic waves in most media of interest, and the inability to apply time-varying gain to the continuous wave (CW) HSR signal precludes sufficient effective penetration depth. While it is true that the fundamental physics of HSR, with its use of a CW signal, does not allow amplification of later (i.e. deeper) arrivals in lossy media (as is possible with impulse subsurface radar — ISR), HSR has distinct some distinctive advantages. The most important of these is the ability to do shallow subsurface imaging with a resolution that is not possible with ISR. In addition, the design of an HSR system is simpler than for ISR due to the relatively low-tech transmitting and receiving antennae. This paper provides a review of the main principles of HSR through an optical analogy and describes possible algorithms for radar hologram reconstruction. We also present a review of the history of development of systems and applications for HSR of the “RASCAN” type which is possibly the only holographic subsurface radar that is produced in lots. Among the subsurface imaging and remote sensing applications considered are humanitarian demining, construction inspection, surveys of historic architecture and artworks, nondestructive testing of dielectric aerospace materials, security applications, paleontology, detection of wood-boring insect damage, and others. Each application is illustrated with relevant data acquired in laboratory and/or field experiments.

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“…Большинство сред, исследуемых в подповерхност-ной радиолокации, не удовлетворяют этому требованию. Однако встречаются и исключения из этого правила -композиционные материалы на основе стекло-и квар-цевого волокна [21,22], а также вспененного полиуре-тана [8,23]. Особый интерес к исследованию покрытий из полиуретановой пены возник после катастрофы Space Shuttle Columbia в 2003 г. Этот материал, обладающий уникально низкой теплопроводностью и низким удель-ным весом [23,24], использовался для теплоизоляции внешнего топливного бака с криогенным топливом.…”

Section: экспериментальные результатыunclassified

“…Перечислим неко-торые из них: инженерная геология [3], обнаружение мин [4][5][6], обследование строительных конструкций и объектов культурного наследия [7], неразрушающий кон-троль диэлектрических материалов [8] и др.…”

Section: Introductionunclassified

Использование Методов Голографической Подповерхностной Радиолокации Для Неразрушающего Контроля Диэлектрических Конструкций

Ивашов¹,

Бугаев²,

Журавлев³

et al. 2018

Журнал Технической Физики

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Holographic subsurface radar for diagnostics of cryogenic fuel tank thermal insulation of space vehicles

Cited by 21 publications

References 13 publications

Design and Applications of Multi-Frequency Holographic Subsurface Radar: Review and Case Histories

Design and Applications of Multi-Frequency Holographic Subsurface Radar: Review and Case Histories

Design and Applications of Multi-Frequency Holographic Subsurface Radar: Review and Case Histories

Использование Методов Голографической Подповерхностной Радиолокации Для Неразрушающего Контроля Диэлектрических Конструкций

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