Linear-Stokes Hyper Temporal Polarimeter for Long-Range Characterization of Vibrating Objects
Author
Richter, JulianaIssue Date
2022Keywords
Optical engineeringpassive illumination
polarimeter tolerance analysis
polarization
remote sensing
vibrometry
Advisor
Hart, Michael
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The University of Arizona.Rights
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction, presentation (such as public display or performance) of protected items is prohibited except with permission of the author.Abstract
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 sunlight and reflect partially polarized light according to the Fresnel reflection coefficients, which will vary with angle of incidence. Mechanical vibrations in a target deflect the surface normal and thus the effective angle of incidence and exiting polarization state 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. HyTeP has demonstrated accurate frequency measurement from 10 to 1500 Hz with 0.5 Hz RMS accuracy when sampling a target at 3.36 kHz. Amplitude tests indicate that HyTeP can detect vibrations with amplitudes as small as 2.2 microns. This body of work examines optimal polarimeter designs, whether the science goal demands imaging speed, SNR, or estimation of satellite orientation; as well as adaptations for novel applications for remote passive-illumination polarimetric vibrometry.Type
textElectronic Dissertation
Degree Name
Ph.D.Degree Level
doctoralDegree Program
Graduate CollegeOptical Sciences