Advanced High-Resolution Optical Sensor for Time-Resolved Measurements in Extreme Exhaust Plumes

Exhaust plumes from high-temperature and high-velocity aircraft engines and rockets present a significant measurement challenge due to their extreme conditions. Current measurement techniques have limited spatial and temporal resolution and are often invasive, limiting the data that can be collected. To address this need, we propose a compact optical sensor combining time-resolved coherent anti-Stokes Raman scattering (CARS) spectroscopy and tunable diode laser absorption spectroscopy (TDLAS). The key advancement is in using high-precision CARS measurements in the 1¢10 kHz range to anchor TDLAS measurements in the 10¢100 kHz range, thereby providing an ideal combination of capabilities necessary for full characterization of high-temperature/high velocity exhaust plumes. The sensor, designed for harsh environments with temperatures from 500 to 3000 K and high velocities, employs advanced laser systems, optical designs, and signal processing algorithms. This system offers unprecedented capabilities for combustion research and propulsion system optimization.