A technique is described for imaging the injectant mole-fraction distribution in nonreacting compressible mixing flow fields. Planar fluorescence from iodine, seeded into air, is induced by a broadband argon-ion laser and collected using an intensified charge-injection-device array camera. The technique eliminates the thermodynamic dependence of the iodine fluorescence in the compressible flow field by taking the ratio of two images collected with identical thermodynamic flow conditions but different iodine seeding conditions. The resulting images are, to our knowledge, the first quantitative planar measurements of mole-fraction distributions in a nonreacting compressible flow field and allow mixing to be studied directly.
© 1989 Optical Society of America
Original Manuscript: January 27, 1989
Manuscript Accepted: May 18, 1989
Published: August 15, 1989
Roy J. Hartfield, John D. Abbitt, and James C. McDaniel, "Injectant mole-fraction imaging in compressible mixing flows using planar laser-induced iodine fluorescence," Opt. Lett. 14, 850-852 (1989)