Tomographic imaging of temperature and chemical species based on hyperspectral absorption spectroscopy.

摘要

A novel technique has been developed to obtain simultaneous tomographic images of temperature and concentration of chemical species based on hyperspectral absorption spectroscopy. The hyperspectral tomography technique enables several key advantages when compared to traditional tomography techniques based on limited spectral information. These advantages include a significant reduction in the number of required projection measurements, and an enhanced insensitivity to measurements/inversion uncertainties. These advantages greatly facilitate the practical implementation and application of the hyperspectral tomography technique. This dissertation reports the development of this new technique, including the mathematical formulation of the hyperspectral tomographic problems, numerical demonstrations, and experimental demonstrations. A prototype sensor has been developed and demonstrated on laboratory flames and controlled test cells. Potential applications in automotive engines are discussed. The spatial and temporal resolution enabled by this new sensing technique is expected to resolve several key issues in practical combustion devices.