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A numerical investigation of high resolution multispectral absorption tomography for flow thermometry

Cai W(蔡伟伟), Kaminski CF, "A numerical investigation of high resolution multispectral absorption tomography for flow thermometry", Applied Physics B, 2015, Springer Berlin Heidelberg, pp. 1-7 . DOI: 10.1007/s00340-015-6012-5 | pdf 


Multispectral absorption tomography (MAT) is now a well-established
technique that can be applied for the simultaneous imaging of temperature,
species concentration, and pressure of reactive flows. However, only
intermediate spatial resolution, on order of 15×15 grid points, has so far been
achievable in previous demonstrations. The aim of the present work is to
provide a numerical validation of our MAT algorithm for thermometry of
combusting flows, but with greatly improved spatial resolution to motivate its
experimental realization in practical environments. We demonstrate a grid
resolution that is comparable to that of classical absorption tomography (CAT)
containing 80×80 elements from only two orthogonal projections, which is
impractical to realize with CAT but especially desirable for applications where
optical access is limited. This is achieved using the smoothness assumption,
which holds true under most combustion conditions. The study shows that
better spatial resolution can be obtained through a simple increase in the
spatial sampling frequency for the two available projections, as the
smoothness condition becomes more reliable on smaller spatial scales. Our
work also demonstrates the first application of MAT for full volumetric
reconstructions. The studies thus provide robust guidelines for the
implementation of MAT over large spatial scales and lay solid foundations for
its development and application in complex technical combustion scenarios,
where spatial resolution is crucial to investigate the interaction of flow
phenomena with chemical reactions.