气体自由喷射的单次体视3维层析激光诱导荧光成像研究
Single-shot, tomographic imaging of the three-dimensionalconcentration field is demonstrated in a turbulent gaseous free jet in co-flowusing volumetrically illuminated laser-induced fluorescence. The fourthharmonicoutput of an Nd:YAG laser at 266 nm is formed into a collimated15 × 20 mm2 beam to excite the ground singlet state of acetone seeded intothe central jet. Subsequent fluorescence is collected along eight lines ofsight for tomographic reconstruction using a combination of stereoscopesoptically coupled to four two-stage intensified CMOS cameras. Theperformance of the imaging system is evaluated and shown to be sufficientfor 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.