High-bandwidth absorption-spectroscopy measurements of temperature, pressure, CO, and H$$_2$$O in the annulus of a rotating detonation rocket engine

The development and application of two laser-absorption-spectroscopy diagnostics capable of performing high-bandwidth measurements of (1) temperature, pressure, and CO, and (2) temperature and H\(_2\)O in the annular combustion chamber of a rotating detonation rocket engine (RDRE) are presented. The mid-infrared (MIR) diagnostic utilized a quantum-cascade laser (QCL) to measure absorbance spectra of three CO absorption transitions near 2008.5...