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    The Oxford space environment goniometer: A new experimental setup for making directional emissivity measurements under a simulated space environment

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    Authors
    Warren, T.J.
    Bowles, N.E.
    Donaldson Hanna, K.
    Thomas, I.R.
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    Discipline
    Physical sciences
    Subject
    Laboratories
    Light scattering
    Space optics
    Surface roughness
    Directional emissivity
    Equivalent measurement
    Planetary regolith
    Planetary remote sensing
    Remote sensing data
    Remote sensing techniques
    Space environment
    Visible wavelengths
    Remote sensing
    Audience
    Scientific
    Date
    2017
    Metadata
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    Description
    Measurements of the light scattering behaviour of the regoliths of airless bodies via remote sensing techniques in the Solar System, across wavelengths from the visible to the far infrared, are essential in understanding their surface properties. A key parameter is knowledge of the angular behaviour of scattered light, usually represented mathematically by a phase function. The phase function is believed to be dependent on many factors including the following: surface composition, surface roughness across all length scales, and the wavelength of radiation. Although there have been many phase function measurements of regolith analog materials across visible wavelengths, there have been no equivalent measurements made in the thermal infrared (TIR). This may have been due to a lack of TIR instruments as part of planetary remote sensing payloads. However, since the launch of Diviner to the Moon in 2009, OSIRIS-Rex to the asteroid Bennu in 2016, and the planned launch of BepiColombo to Mercury in 2018, there is now a large quantity of TIR remote sensing data that need to be interpreted. It is therefore important to extend laboratory phase function measurements to the TIR. This paper describes the design, build, calibration, and initial measurements from a new laboratory instrument that is able to make phase function measurements of analog planetary regoliths across wavelengths from the visible to the TIR.
    Citation
    Warren, T.J.; Bowles, N.E.; Donaldson Hanna, K.; Thomas, I.R. (2017). The Oxford space environment goniometer: A new experimental setup for making directional emissivity measurements under a simulated space environment. , Review of Scientific Instruments, Vol. 88, Issue 12, A124502, DOI: 10.1063/1.4986657.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/6359
    doi: http://dx.doi.org/10.1063/1.4986657
    scopus: 2-s2.0-85038395055
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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