KEYWORDS: Polarimetry, Remote sensing, Algorithm development, Data modeling, Atmospheric optics, Clouds, Atmospheric sensing, Current controlled current source, Instrument modeling, Head
URMS was proposed within the framework of a German priority program (PP 1294, Atmosphären- und
Erdsystemforschung mit dem Forschungsflugzeug HALO (High Altitude and Long Range Research Aircraft)). The
project proposal resulted of the facts that experimental setups with state-of-the-art measurement principles and multidirectional
geometries in the field of scientific aircraft radiation measurements are very difficult or not possible to
achieve with the existing aircrafts and their openings and mounting points. Thus it is very difficult to develop and
enhance remote sensing instruments and the corresponding new models and algorithms to analyze the resulting data.
URMS will give the possibility to perform multi directional measurements with experimental instrument setups. An
optical entrance head with a dual mirror system simular to a coleostat in front of a Wing-Pod will guide the light
scattered from surfaces and/or the atmosphere into a Wing-Pod frame. A temperatur stabilized container will hold the
optical instrument inside a stable environment. An Airborne Multispectral Sunphoto- and Polarimeter was proposed as a
first state-of-the-art instrument setup.
This paper describes the first results of measurements with the new sensor module FUBISS-Polar. The system measures hyper spectral polarimetric sky radiances in the spectral range from 250 to 1080 nm at four different polarization angles (0°, 45°, 90°, 135°) and enables the calculation of the degree of the linear polarization (DOLP) and its azimuth. This paper will give an overview of the instrument and the data calibration procedures and will present the first results of measurements taken at the laboratory and at three different field campaigns. The field campaign measurements were done in the principle plane of the sun during clear sky conditions in arctic environments (Ny Alesund, Svalbard), on top of the mountain Zugspitze (Alps, Germany) and in urban environments (Berlin, Germany).
The Institute for Space Sciences at the Free University Berlin has built an instrument for hyperspectral measurements (FUBISS). A new polarization entrance optics and a motion control unit is going to be adopted to that system to open up the possibility to derive hyperspectral polarization measurements in the atmosphere in the spectral region from the visible to the near IR. The system is ground based and includes the ground based version of the aureole Sun-Photometer FUBISS-SIRA and FUBISS-ASA. The polarization measurements enable the calculation of the stokes vector and the degree of polarization measurements enable the calculation of the stokes vector and the degree of polarization and angle at predefined incident viewing angles. One possible application will be the characterization of aerosols by retrieving profiles of their optical and micro physical properties.
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