Advanced Diagnostics for COIL and DOIL

In this paper we discuss the application of sensitive, non-intrusive diagnostic techniques to characterize species in the flow that are critical for chemical oxygen iodine laser (COIL) devices and the electric discharge oxygen iodine laser (DOIL) concept. The key diagnostics include chemiluminescence to detect O 2 (a,b) and I( 2 P 1/2 ) and tunable diode laser absorption measurements of I* and temperature. We have characterized variations in O and O 2 (a) yields with discharge power and oxygen mole fraction. We observe O 2 (a) yields to increase dramatically with decreasing oxygen mole fraction. We also discuss the application of a novel imaging diagnostic to obtain 2-D images of species concentrations and temperature.