Linear Stokes measurement of thermal targets using compact LWIR spectropolarimeter

Kira A. Hart; Meredith Kupinski; Dong Wu; Russell A. Chipman

doi:10.1117/12.2557887

22 May 2020 Linear Stokes measurement of thermal targets using compact LWIR spectropolarimeter

Kira A. Hart, Meredith Kupinski, Dong Wu, Russell A. Chipman

Proceedings Volume 11412, Polarization: Measurement, Analysis, and Remote Sensing XIV; 114120H (2020) https://doi.org/10.1117/12.2557887
Event: SPIE Defense + Commercial Sensing, 2020, Online Only

Abstract

The trade-off between spectral resolution and instrument throughput is analyzed for a compact, uncooled, longwave infrared (LWIR) channeled spectropolarimeter (IRCSP). The IRCSP was developed as a part of the Sub-mm Wave and InfraRed Polarimeters (SWIRP) project out of NASA's Goddard Spaceflight Center. The IRCSP scientific objective targets measurements of AOLP and DOLP with 1-µm spectral resolution from 8.5 - 12.5µm in a single snapshot. The geometry of the field stop determines the field of view (FOV) of the IRCSP. This work relates the spectral resolution, instrument throughput, and polarimetric accuracy of a spectro-polarimeter to the FOV. The accuracy of linear Stokes retrievals for low temperature thermal targets are predicted for varying FOV and measurement noise conditions. This work presents a method to quantify the achievable accuracy in AOLP and DOLP as a function of field stop dimensions and signal-to-noise ratio (SNR). While smaller field stops are shown to improve accuracy as the spectral resolution is increased, low SNR is the dominant source of error for the IRCSP prototype. For the IRCSP, a SNR of at least 80 is required to produce DOLP measurements with < 5% error for targets with DOLP < 0.2.

Conference Presentation

Citation Download Citation

Kira A. Hart, Meredith Kupinski, Dong Wu, and Russell A. Chipman "Linear Stokes measurement of thermal targets using compact LWIR spectropolarimeter", Proc. SPIE 11412, Polarization: Measurement, Analysis, and Remote Sensing XIV, 114120H (22 May 2020); https://doi.org/10.1117/12.2557887

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