Abstract
Film-optical-access H2O absorption tomography is, for the first time, applied to a practical diesel aftertreatment system. A single rotation stage and a single translation stage are used to move a single laser beam to obtain each of the 3480 line-of-sight measurements used in the tomographic reconstruction. It takes 1 h to acquire one image in a 60-view-angle measurement. H2O images are acquired in a 292.4-mm-diameter selective catalytic reduction (SCR) can with a 5-mm spatial resolution at temperatures in the 158–185 °C range. When no liquid H2O is injected into the gas, the L1 norm-based uniformity index is 0.994, and the average mole fraction error is − 6% based on a separate FTIR measurement. When liquid water is injected through the reductant dosing system designed to inject diesel exhaust fluid, nonuniformity is observed, as evidenced by measured uniformity indices for H2O in the 0.977–0.986 range. A mixing plate installed into the system is able to improve the uniformity of the H2O mole fraction.
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