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   https://doi.org/10.1175/JAMC-D-23-0204.1  

   Mishler, Reese ; Zhang, Guifu ; Mahale, Vivek_N ( July 2024 , Journal of Applied Meteorology and Climatology)

   Polarimetric variables such as differential phase Φ_DPand its range derivative, specific differential phaseK_DP, contain useful information for improving quantitative precipitation estimation (QPE) and microphysics retrieval. However, the usefulness of the current operationally utilized estimation method ofK_DPis limited by measurement error and artifacts resulting from the differential backscattering phaseδ. The contribution ofδcan significantly influence the Φ_DPmeasurements and therefore negatively affect theK_DPestimates. Neglecting the presence ofδwithin non-Rayleigh scattering regimes has also led to the adoption of incorrect terminology regarding signatures seen within current operationalK_DPestimates implying associated regions of unrealistic liquid water content. A new processing method is proposed and developed to estimate bothK_DPandδusing classification and linear programming (LP) to reduce bias inK_DPestimates caused by theδcomponent. It is shown that by applying the LP technique specifically to the rain regions of Rayleigh scattering along a radial profile, accurate estimates of differential propagation phase, specific differential phase, and differential backscattering phase can be retrieved within regions of both Rayleigh and non-Rayleigh scattering. This new estimation method is applied to cases of reported hail and tornado debris, and the LP results are compared to the operationally utilized least squares fit (LSF) estimates. The results show the potential use of the differential backscattering phase signature in the detection of hail and tornado debris.

    

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2. Frame Phase-Retrievability and Exact Phase-Retrievable Frames

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3. Variational Phase Field Formulations of Polarization and Phase Transition in Ferroelectric Thin Films

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   Du, Qiang ; Li, Ruotai ; Zhang, Lei ( January 2020 , SIAM Journal on Applied Mathematics)
4. Phase Equilibria and Condensed Phase Properties of Fluorinated Alkanes via First Principles Simulations

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5. Independent measurement of phase and amplitude modulation in phase change material-based devices

   https://doi.org/10.1364/OME.463337  

   Sevison, Gary_A ; Malone, Trent ; Heenkenda, Remona ; Burrow, Joshua_A ; Sarangan, Andrew ; Hendrickson, Joshua_R ; Agha, Imad ( June 2022 , Optical Materials Express)

   For active beam manipulation devices, such as those based on liquid crystals, phase-change materials, or electro-optic materials, measuring accumulated phase of the light passing through a layer of the material is imperative to understand the functionality of the overall device. In this work we discuss a way of measuring the phase accumulation through a switched layer of Ge₂Sb₂Te₅, which is seeing rapid use as means to high speed dynamic reconfiguration of free space light. Utilizing an interferometer in the switching setup and modulating the phase of one arm, the intensity of a probe beam can be captured and phase data pulled from it. Simulations were used to discover the connection between the intensity modulations and the phase information. The technique was tested experimentally and it was found that within error, the measurement was robust and repeatable.

    

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