Hyperspectral polarimetry of eight Apollo soils

Sun, Lingzhi; Lucey, P. G.; Honniball, C. I.; Sandford, M.; Costello, E. S.; Burkhard, L. M.; Brennan, Reilly; Ferrari-Wong, Chiara

doi:10.1016/j.icarus.2021.114740

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…Unexploded ordnance (UXO) is a worldwide problem and a long-term hazard that can remain active and destructive for decades after the end of a conflict, thereby endangering humanity, making the rapid and effective detection of UXO of great importance to human civilization [1] . Spectral polarization imaging technology can obtain two-dimensional spatial information, one-dimensional spectral information, and polarization state information such as Degree of linear polarization(DoLP), Angle of linear polarization(AoLP), polarization ellipticity and rotation direction of the target, thus characterizing some information that is more difficult to characterize with intensity measurements, such as the chemical composition properties, roughness, surface texture characteristics and edge information of the target surface [2][3][4][5][6] . Compared to conventional light intensity detection, greatly increasing the information content of remote sensing data, which is of great value for target detection, especially in military applications [7] .…”

Section: Introductionmentioning

confidence: 99%

Research on hyperspectral polarization detection for unexploded ordnance target identification

Zhang,

Li,

et al. 2023

3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023)

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By analyzing the principle of polarization detection, a method of identifying unexploded ordnance using polarization spectral information is presented. Then a polarization hyperspectral detection system was designed. Finally, the system was used to conduct detection experiments on mines in the background of cluttered grass at 400-1000nm band. The experimental results indicated that the polarization characteristics of the unexploded ordnance and the natural background were different, and the use of polarization detection technology could well distinguish the unexploded ordnance from the natural background and improve the accuracy of target detection and scene identification, especially in the 450-800 nm band to achieve effective detection and identification of camouflaged targets from the cluttered background.

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Section: Introductionmentioning

confidence: 99%

Research on hyperspectral polarization detection for unexploded ordnance target identification

Zhang,

Li,

et al. 2023

3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023)

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Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength

Alhaddad

Förstner

Grynko

2023

Journal of Quantitative Spectroscopy and Radiative Transfer

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Unique regolith characteristics of the lunar swirl Reiner Gamma as revealed by imaging polarimetry at large phase angles

Bhatt¹,

Wöhler²,

Rogall³

et al. 2023

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Context. Lunar swirls are high-albedo irregular markings that are generally associated with prominent magnetic anomalies. The formation of swirls is still unknown. Near-infrared spacecraft-based imaging suggests reduced space weathering at the locations of swirls. However, the reduced space weathering alone cannot explain the observed spectral properties. Aims. We provide detailed physical characteristics of the regolith at the Reiner Gamma swirl. For the first time, systematic telescopic observations in a range of phase angles are used to derive the surface roughness, opposition effect strength, and grain size distribution at a spatial resolution of 1 km. Methods. Imaging polarimetric observations of Reiner Gamma were obtained at the Mount Abu IR Observatory between January and March, 2021. These observations were collected with the two narrow-band continuum filters, GC (green) and RC (red), in a range of phase angles. The georeferenced polarimetric images were used to derive the single-scattering albedo, photometric roughness, and amplitude of the opposition effect by adopting the Hapke reflectance model. We further computed median regolith grain size maps of Reiner Gamma using the derived photometric roughness, albedo, and degree of polarization. Results. A comparison of the polarization properties of Reiner Gamma swirl with the craters Kepler and Aristarchus suggests grain size variations within the swirl structure. The Hapke modeling of the Reiner Gamma swirl suggests significant changes in the opposition effect strength at the central oval, but only marginal differences in surface roughness from its surroundings. Within the swirl, the median grain size varies significantly in comparison to the background mare grain size of ~45 µm. Conclusions. Our results confirm the occurrence of surface alteration processes that might have disrupted the regolith microstructure in the Reiner Gamma swirl. These findings are consistent with an external mechanism of swirl formation, by considering interaction between the regolith and cometary gas. Subsequent to its formation, the swirl structure was preserved due to shielding by crustal magnetic field.

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Hyperspectral polarimetry of eight Apollo soils

Cited by 4 publications

References 16 publications

Research on hyperspectral polarization detection for unexploded ordnance target identification

Research on hyperspectral polarization detection for unexploded ordnance target identification

Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength

Unique regolith characteristics of the lunar swirl Reiner Gamma as revealed by imaging polarimetry at large phase angles

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