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Publications (3)2.24 Total impact

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    ABSTRACT: An inline evaporation system for depositing Cu(InGa)Se<sub>2</sub> films from elemental sources was characterized. The system demonstrated reproducibly good deposition uniformity and device performance for translation speeds ranging from 1 to 2.5 inches/min. A source effusion model predicting film thickness, composition, and compositional gradients was developed and tested. The effusion model was reasonably successful in predicting measured film characteristics. The model can be further improved by a more accurate description of the flux profiles. In addition, effusion in the transitional flow regime and the possibility of Ga-ln interdiffusion need to be explored. Such an improved model would be a valuable tool for the design and development of commercial scale systems, as well as for improved efficiency and flexibility in manufacturing
    Photovoltaic Specialists Conference, 2000. Conference Record of the Twenty-Eighth IEEE; 02/2000
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    ABSTRACT: A controller which employs dynamically scheduled control parameters has been introduced in earlier work by the authors (1998). This dynamic gain scheduling (DGS) algorithm is extended for multivariable processes and systems with arbitrary relative degree. The multi-input multi-output DGS controller is demonstrated on an industrial benchmark problem-a solution copolymerization process. Simulations show that the DGS controller is significantly better than a four PI controller system, and compares favorably to a 3×3 model predictive controller
    American Control Conference, 1998. Proceedings of the 1998; 07/1998
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    ABSTRACT: A controller design strategy for nonlinear systems with two manipulated inputs and one controlled output is proposed. The technique is called “habituating control” as a result of its similarity to control schemes commonly used in biological systems. A nonlinear control law that provides input-output linearization while simultaneously minimizing the “cost” of affecting control is derived. The cost function employed differs according to the relative degrees of the two inputs. Local stability analysis shows that the habituating controller can provide a simple solution to the singularity and nonminimum phase problems. The method is evaluated using a nonlinear chemical reactor model
    Control Applications, 1996., Proceedings of the 1996 IEEE International Conference on; 10/1996