Bi-directional reflectance and polarization measurements of pulse-laser irradiated airless body analog materials
Jiang, Te1; Zhang, Hao1,2; Yang, Yazhou1; Hu, Xiaoyi1; Ma, Pei1; Sun, Yuxue1; Britt, Daniel3; Wang, Weigang4; Lu, Xiaoping5; Huang, Jiangchuan6; Hsu, Weibiao2,5,7; Mei, Bao5; Wei, Ruyi8
Source PublicationICARUS
Corresponding AuthorZhang, Hao(
AbstractSpace weathering (SW) processes including solar wind irradiation and micrometeorite bombardment produce nano-phase iron (npFe) and amorphous layers that redden and darken the visible and near-infrared (VNIR) reflectance spectra of the surface of airless bodies. To understand how SW may affect the directional reflectance and polarization properties of regolith layers, we carried out pulsed laser irradiation experiments to simulate micrometeorite bombardment process on olivine (OL), orthopyroxene (OPX), anorthosite (AN), ilmenite (ILM), and JSC-1A Lunar Regolith Simulant (LRS). All samples have been equalized with a size distribution of (< 45 mu m) and the unsieved LRS with (< 1 mm) was also used. Depending on each samples difficulty level of weathering, 2 to 8 irradiations with single pulse energy of 50 mJ were used in the irradiations. We measured the spectral reflectance from 0.5 to 25 mu m, bi-directional reflectance distribution function (BRDF) and polarization phase curves at 0.633 mu m of the samples before and after irradiations. Scanning electron microscopic images show that the irradiated samples become rougher with produced melts and agglutinates. The VNIR reflectance spectra of all irradiated samples show prominent darkening and reddening, except for the unsieved LSR sample which shows spectral blueing. Compared to that of the original samples, the BRDF of irradiated OL and OPX have both enhanced back-and forward-scattering components, while the other 4 samples have enhanced back scattering but nearly unchanged (AN, ILM, JSC-1A (< 45 mu m)) or decreased (JSC-1A (< 1 mm)) forward scattering. In general, the irradiated samples have larger positive polarization values DOPmax as compared to the original samples, consistent with the Umov law prediction. Within measurement uncertainties, the irradiated samples did not show systematic changes in the minimum polarization value DOPmin and the polarization inversion angle alpha(inv) Using OL as an example, numerical radiative transfer computations verified that, the BRDF of olivine grains with npFe distributed uniformly inside the grains or coated with npFe have enhanced back-and forward scattering components as compared with that of the original grains, consistent with measurement results. A 5-parameter Hapke photometric model inversion has shown that all sample grains except OPX have become more backscattering (with smaller asymmetry parameters) upon the strongest irradiation as compared with the original ones. These results indicate that the directional reflectance properties of space weathered regolith grains of airless bodies may be more backscattering than that of fresh materials.
KeywordAsteroids, surfaces Moon, surface Photometry Polarimetry Spectroscopy
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000473554600012
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZhang, Hao
Affiliation1.China Univ Geosci, Sch Earth Sci, Planetary Sci Inst, Wuhan, Hubei, Peoples R China
2.CAS Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China
3.Univ Cent Florida, Orlando, FL 32816 USA
4.Beijing Inst Space Mech & Elect, Beijing, Peoples R China
5.Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R China
6.China Acad Space Technol, Beijing, Peoples R China
7.Chinese Acad Sci, Purple Mt Observ, Nanjing, Jiangsu, Peoples R China
8.Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Spectral Imaging Technol, Xian, Shaanxi, Peoples R China
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Jiang, Te,Zhang, Hao,Yang, Yazhou,et al. Bi-directional reflectance and polarization measurements of pulse-laser irradiated airless body analog materials[J]. ICARUS,2019,331:127-147.
APA Jiang, Te.,Zhang, Hao.,Yang, Yazhou.,Hu, Xiaoyi.,Ma, Pei.,...&Wei, Ruyi.(2019).Bi-directional reflectance and polarization measurements of pulse-laser irradiated airless body analog materials.ICARUS,331,127-147.
MLA Jiang, Te,et al."Bi-directional reflectance and polarization measurements of pulse-laser irradiated airless body analog materials".ICARUS 331(2019):127-147.
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