简介:Single-shot, tomographic imaging of the three-dimensional
concentration field is demonstrated in a turbulent gaseous free jet in co-flow
using volumetrically illuminated laser-induced fluorescence. The fourthharmonic
简介:Single-shot, tomographic imaging of the three-dimensional
concentration field is demonstrated in a turbulent gaseous free jet in co-flow
using volumetrically illuminated laser-induced fluorescence. The fourthharmonic
output of an Nd:YAG laser at 266 nm is formed into a collimated
15 × 20 mm2 beam to excite the ground singlet state of acetone seeded into
the central jet. Subsequent fluorescence is collected along eight lines of
sight for tomographic reconstruction using a combination of stereoscopes
optically coupled to four two-stage intensified CMOS cameras. The
performance of the imaging system is evaluated and shown to be sufficient
for recording instantaneous three-dimensional features with high signal-tonoise
(130:1) and nominal spatial resolution of 0.6–1.5 mm at x/D = 7–15.5.详细>