Passsive UV Imaging Polarimeter For Atmospheric Studies

A new UV imaging polarimeter design was demonstrated by Optical Coating Solutions, Inc. (OCS) as a proof-of-concept breadboard in a 2016 Phase I effort (NASA Contract NNX16CA44P). A version of that generic design is proposed for atmospheric studies in a follow-on effort.nbsp;The new polarimeter design can operate to wavelengths as short as 260nm and does not employ electronic or mechanical modulation to measure polarization properties. The advantages overcome the limitations present in current polarimeter designs. Polarimetry of atmospheres to wavelengths shorter than 400 nm will assist in the determination of the distribution vs. altitude of aerosols, size, shape, and absorption properties of the scattering particles, and is useful for separating multiply- and singly-scattering components. Compact in volume, the Passive UV Imaging Polarimeter can be deployed as multiple units aimed to different view angles for simultaneous wide- angle coverage.nbsp;The unique compact architecture is well suited for extended space missions because it satisfies low power and weight budget requirements, has inherently high radiation-tolerant components. In addition, it incorporates a built-in stability monitor with two polarization-references that promotes high polarimetric accuracy. Modifications resulting in prototype model will advance the TRL to 5 or 6.