TY - GEN
T1 - Excitation line optimization for krypton tagging velocimetry and planar laser-induced fluorescence in the 200-220 nm range
AU - Shekhtman, D.
AU - Mustafa, M. A.
AU - Parziale, N. J.
N1 - Publisher Copyright:
© 2021, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2021
Y1 - 2021
N2 - Krypton tagging velocimetry (KTV) requires high signal-to-noise ratio (SNR) to observe high-speed boundary layers and flow structures. In order to optimize the choice of laser excitation line for use in KTV (212.556 nm, 214.769 nm, 216.667 nm), a theoretical and experimental investigation of excitation processes was undertaken. This paper presents a multi-path, two-photon excitation, cross-section calculation, using an assumed finite basis of states consisting of 4p, 5s, 6s, 7s, 5p, 6p, 4d, 5d, and 6d orbitals. From the relative magnitudes of two-photon cross-sections for five Krypton lines, an excitation spectrum is constructed and compared against excitation spectrum data, with encouraging results. From this work and the successful comparison to experiment from our lab and those in the literature, we conclude that the optimal line is 212.556 nm for Kr-PLIF and single-laser KTV. For KTV where the read step in performed with a continuous wave (CW) laser diode, the 216.667 nm write-laser excitation is optimal.
AB - Krypton tagging velocimetry (KTV) requires high signal-to-noise ratio (SNR) to observe high-speed boundary layers and flow structures. In order to optimize the choice of laser excitation line for use in KTV (212.556 nm, 214.769 nm, 216.667 nm), a theoretical and experimental investigation of excitation processes was undertaken. This paper presents a multi-path, two-photon excitation, cross-section calculation, using an assumed finite basis of states consisting of 4p, 5s, 6s, 7s, 5p, 6p, 4d, 5d, and 6d orbitals. From the relative magnitudes of two-photon cross-sections for five Krypton lines, an excitation spectrum is constructed and compared against excitation spectrum data, with encouraging results. From this work and the successful comparison to experiment from our lab and those in the literature, we conclude that the optimal line is 212.556 nm for Kr-PLIF and single-laser KTV. For KTV where the read step in performed with a continuous wave (CW) laser diode, the 216.667 nm write-laser excitation is optimal.
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M3 - Conference contribution
AN - SCOPUS:85100307179
SN - 9781624106095
T3 - AIAA Scitech 2021 Forum
SP - 1
EP - 27
BT - AIAA Scitech 2021 Forum
T2 - AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021
Y2 - 11 January 2021 through 15 January 2021
ER -