Dissertation Defense: Juliana Richter, "Linear-Stokes hyper temporal polarimeter for long-range characterization of vibrating objects"

    Tuesday, January 11, 2022 - 12:00pm

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    Zoom link: https://arizona.zoom.us/s/4673238523

    Password: vibecheck


    The Hyper-Temporal Polarimeter [HyTeP] is a linear-Stokes polarimeter capable of sensing vibration modes in a distant target. Solar panels present on almost all satellites are illuminated with incoherent light and reflect partially polarized according to the Fresnel reflection coefficients, which vary with angle of incidence. Mechanical vibrations in a target deflect the surface normal and the effective angle of incidence for a stationary source. The extent by which the light is partially polarized is quantified as the degree of linear polarization [DoLP] and the orientation of linear polarization is given as the angle of linear polarization [AoLP] for the incoherent sum across the observed bandwidth. Temporal imaging captures structural information with low noise at high speeds. With sufficient imaging speed, a discrete Fourier transform converts temporal DoLP and AoLP data to frequency space, where these surface deflections can be understood as vibrational frequencies. Prior work has demonstrated that vibrational frequencies are unique to a target and can be understood as a polarization signature useful for identification and monitoring. This body of work examines polarimeter design choices to consider whether the priority of the science goal is imaging speed, SNR, or estimation of satellite orientation as well as adaptations for novel applications for remote passive-illumination polarimetric vibrometry.