Dual-pump coherent anti-Stokes Raman scattering for simultaneous pressure/temperature measurement

Foglesong, Robert E.; Green, Stephen M.; Lucht, Robert P.; Dutton, J. C.

doi:10.2514/3.13803

Cited by 1 publication

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“…CARS pressure measurements have also been demonstrated in compressible flow fields, but pressure monitoring has received comparatively less attention. The most detailed demonstration of CARS as a pressure diagnostic to date was conducted by Lucht and coworkers, who used dual-pump CARS [7] and high-resolution vibrational CARS [8,9] of air and N 2 in gas cells and underexpanded jets. The measurements showed feasibility of CARS pressure measurements which exploit the sensitivity of Raman linewidths to collisions, and the competing effect of collisional narrowing.…”

Section: Introductionmentioning

confidence: 99%

Pressure Monitoring Using Hybrid fs/ps Rotational CARS

Kearney

Danehy

2015

53rd AIAA Aerospace Sciences Meeting

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We investigate the feasibility of gas-phase pressure measurements at kHz-rates using fs/ps rotational CARS. Femtosecond pump and Stokes pulses impulsively prepare a rotational Raman coherence, which is then probed by a high-energy 6-ps pulse introduced at a time delay from the Raman preparation. Rotational CARS spectra were recorded in N 2 contained in a room-temperature gas cell for pressures from 0.1 to 3 atm and probe delays ranging from 10-330 ps. Using published self-broadened collisional linewidth data for N 2 , both the spectrally integrated coherence decay rate and the spectrally resolved decay were investigated as means for detecting pressure. Shot-averaged and single-laser-shot spectra were interrogated for pressure and the accuracy and precision as a function of probe delay and cell pressure are discussed. Single-shot measurement accuracies were within 0.1 to 6.5% when compared to a transducer values, while the precision was generally between 1% and 6% of measured pressure for probe delays of 200 ps or more, and better than 2% as the delay approached 300 ps. A byproduct of the pressure measurement is an independent but simultaneous measurement of the gas temperature.

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Section: Introductionmentioning

confidence: 99%