Abstract
We demonstrate the use of a film to enable optical access to enclosed gases. We use absorption tomography to image H2O in a 101.6-mm-diameter duct with 2-mm spatial resolution. Considering the central 94 mm, the standard deviation of the image is 1.6 %, and the average mole fraction error is −0.008 %. A polybenzimidazole film is identified to be a candidate for extending the technique to enable NH3 imaging in a diesel aftertreatment system.
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