Dense Wavelength-Multiplexed Sensors for Tomography in Hypersonic Flows Using Diode-Laser Technology

We propose to build a wavelength-multiplexed sensor utilizing tunable diode laser technology to perform tomographic analysis of high speed combusting flows. The sensor will have a fast update rate of ~ 1 kHz and will provide sufficient spatial resolution to observe inhomogeneities and sufficient temporal resolution to observe combustion instabilities in the high speed flow. The system will be designed to measure temperature and to detect and quantify H2O, CO, CO2, O2 as well as methane and ethylene concentration. We expect to be able to demonstrate detection of H2O, CO, CO2 and measure temperature during Phase II. The system will employ a new technology known as rainbow tomography in order to augment the spatial resolution and accuracy available from a limited number of probe beams. This system will represent the state-of-the-art in optical diagnostics for ground test applications.