Applied Physics B, 1999: Planar laser-induced fluorescence imaging of carbon monoxide using vibrational (infrared) transitions
Caption:
Kirby BJ, Hanson RK, “Planar laser-induced fluorescence imaging of carbon monoxide using vibrational (infrared) transitions,”Applied Physics B—Lasers and Optics 69:505-507 (1999). doi pdf
Abstract:
We report a new imaging diagnostic suitable for measurements of infrared-active molecules, namely infrared planar laser-induced fluorescence (IR PLIF), in which a tunable infrared source is used to excite vibrational transitions in molecules and vibrational fluorescence is collected by an infrared camera. A nanosecond-pulse Nd:YAG-pumped KTP/KTA OPO/OPA system is used to generate 12 mJ of tunable output near 2.35 microns which excites the 2v band of carbon monoxide (CO); fluorescence resulting from excited CO is collected at 4.7 micron by use of an InSb focal plane array. Quantitative, high-SNR PLIF imaging of gas-phase CO is demonstrated at a 10-Hz acquisition rate with a minimum detection limit of 1350 ppm at 300 K.
Figures:
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- Fig. 1. Tunable infrared source consisting of modified Continuum Mirage 3000 OPO with KTA optical parametric amplifier stages added for increased conversion. doi pdf
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- Fig. 3. Single-shot IR PLIF image of a vortex ring developing from a 6-mm tube. The jet fluid is 50% CO/50% Ar. The ambient gas is air. 12 mJ at 2.35 microns is used to excite the CO. The integration time is 20 microseconds. doi pdf
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- Fig. 5. Turbulent CO/Ar jet in CO/Ar/N2 coflow. Top: Corrected singleshot instantaneous image. White line indicates x/D = 8. Bottom: normalized cuts at x/D = 8 for instantaneous (left) and averaged (right) images are shown in comparison with the gaussian curve which best fits the averaged data. Integration time is 5 microseconds. doi pdf