Simultaneous Temperature, Concentration, and Pressure Imaging of Water Vapor in a Turbine Engine

We present a numerical study demonstrating the simultaneous reconstruction of the temperature, species concentration, and pressure of molecular water vapor, by tomographic means, from near-infrared laser absorption measurements over beam paths transecting the gaseous region. The synthetic measurement data is predicted from a set of randomized distributions of the reconstructed variables using spectroscopic theory and the HITRAN parameter database. Design optimization geometric orientation of the beams is performed to maximize reconstruction accuracy.