Iterative maximum likelihood approach to focal plane array impulse response estimation using random laser speckle

Philip J. Plummer; Kenneth J Barnard; Michael A. Marciniak; Tony Liu

doi:10.1117/12.2625608

27 May 2022 Iterative maximum likelihood approach to focal plane array impulse response estimation using random laser speckle

Philip J. Plummer, Kenneth J Barnard, Michael A. Marciniak, Tony Liu

Author Affiliations +

Proceedings Volume 12106, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XXXIII; 121060I (2022) https://doi.org/10.1117/12.2625608
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Abstract

The continued technology push towards smaller pitch devices, the growing application of strained-layer-superlattice devices and the associated lateral carrier diffusion challenges with both trends make infrared (IR) detector resolution evaluation vital to the IR imaging community. Established methods for direct infrared detector modulation transfer function evaluation, namely laser speckle-based power spectral density methods, are reliant on Fresnel electric field propagation equations and are only applicable in regimes where small angle approximations are valid. This limitation prevents analysis of longer wavelength, smaller pixel pitch focal plane arrays (FPA). An alternative methodology is proposed, utilizing speckle autocorrelation functions to estimate the FPA impulse response. The major technique advantage is the input autocorrelation function is derived via Rayleigh-Sommerfeld propagation equations, making this method valid in a wider array of test geometries than conventional speckle-based methods. Therefore, this technique supports resolution estimation of smaller pixel pitch devices than previously possible with established techniques. This effort outlines an iterative maximum likelihood function-based approach proposed for impulse response estimation, demonstrates the proposed technique’s effectiveness via simulation and discusses the challenges associated with implementing the technique experimentally.

Conference Presentation

Citation Download Citation

Philip J. Plummer, Kenneth J Barnard, Michael A. Marciniak, and Tony Liu "Iterative maximum likelihood approach to focal plane array impulse response estimation using random laser speckle", Proc. SPIE 12106, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XXXIII, 121060I (27 May 2022); https://doi.org/10.1117/12.2625608

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