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1. Characterization of cell level degradation using a Polymer Dispersed Liquid Crystal active shading screen

Author

Glenn Alers, Tyler Chase, Seichi Arai, Kobashi Tsukasa, Bill Dokos, Dan Liddell, and Abraham K. Ishihara

Subjects
chemistry.chemical_classification, Materials science, business.industry, Estimation theory, Polymer, Function (mathematics), Optics, chemistry, Liquid crystal, Degradation (geology), Optoelectronics, Shading, business, Shader, Diode
Abstract

Degradation can be characterized by cell level parameters using one or two diode models. However, estimating these parameters in deployed arrays is a challenge. This paper discuses an active shading method using a custom fabricated Polymer Dispersed Liquid Crystal (PDLC) screen integrated with an EKO-MP170 curve tracer. The parameter estimation method leverages asymptotic approximations and the Lambert-W function for rapid convergence. Details of the construction, testing and validation of the PDLC shader are provided and simulation of the algorithm and preliminary results are discussed.

Published
2013

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