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+ | ====== SSHADE Databases: UH-ApS ====== | ||
+ | === University of Helsinki Astrophysical Scattering and Spectroscopy Database === | ||
+ | University of Helsinki Astrophysical Scattering and Spectroscopy Laboratory (UH-ApS), Planetary System Research group (PSR), Department of Physics, University of Helsinki, Helsinki, Finland | ||
+ | |||
+ | * // | ||
+ | * //Database Manager//: Antti Penttilä | ||
+ | * //Data Providers//: | ||
+ | |||
+ | ----- | ||
+ | |||
+ | The UH laboratory will concentrate on solid and particulate materials with applications on planetary | ||
+ | sciences. In particular, we are measuring in ambient atmospheric conditions and in room temperatures, | ||
+ | mineral materials are mostly measured. The materials are natural but can be synthetically processed to, | ||
+ | e.g., mimic space-weathering effects. We are particularly interested in measuring meteorites and similar | ||
+ | materials. | ||
+ | |||
+ | We are measuring: | ||
+ | - Directional-hemispheric reflectance spectra with integrating-sphere spectrometer, | ||
+ | - Spectro-polarimetric BRDF in the wavelength range from 420 nm to 800 nm and possibility to record different states of linear polarization. Measurement area is from about 1 mm to 1 cm. | ||
+ | - single-particle polarimetric scattering for a few filters in visual wavelengths and different states of linear polarization measured from the complete 4 π solid angle from the particle, except for the lobes close to back- and forward scattering directions. The particle to-be-measured should have size between about 5 mm and 3 cm. | ||
+ | - spectral backscattering in wavelength range from 470 nm to 900 nm. The measurement area is about 1 cm. | ||
+ | |||
+ | We plan to produce reflectance spectra and photometric BRDF for all the samples we measure. | ||
+ | In addition, for some samples we can also produce spectral BRDF, polarimetric BRDF, single-particle | ||
+ | scattering matrix (i.e., Mueller matrix or the 2×2 upper left submatrix of the Mueller matrix), and spectral | ||
+ | backscattering RDF. | ||
+ | |||
+ | In addition, we will consider providing the modeled absorption coefficient (i.e., | ||
+ | imaginary part of the refractive index) for the well-defined solid and particulate samples we measure via | ||
+ | light-scattering simulation modeling of the measurements. | ||
+ | |||
+ | The typical applications are in planetary sciences, especially in asteroid regolith studies, and in the | ||
+ | general verification and development of light-scattering modeling techniques and algorithms. | ||
+ | |||
+ | ----- | ||
+ | |||
+ | The // | ||
+ | |||
+ | |||
+ | * [[sshade: | ||
+ | * [[sshade: | ||
+ | |||
+ | ---- | ||
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+ | ☛ [[https:// |