Burst-mode femtosecond laser electronic excitation tagging for kHz-MHz seedless velocimetry

被引：24
|
作者：
Fisher, Jordan M. [1 ]
Smyser, Michael E. [2 ]
Slipchenko, Mikhail N. [2 ,3 ]
Roy, Sukesh [3 ]
Meyer, Terrence R. [1 ,2 ]
机构：
[1] Purdue Univ, Sch Aeronaut & Astronaut, W Lafayette, IN 47907 USA
[2] Purdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA
[3] Spectral Energies LLC, Beavercreek, OH 45430 USA
来源：
OPTICS LETTERS | 2020年 / 45卷 / 02期
关键词：
VELOCITY-MEASUREMENTS; FLUORESCENCE;
D O I：
10.1364/OL.380109
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Burst-mode femtosecond laser electronic excitation tagging (FLEET) of nitrogen is introduced for tracking the velocity field in high-speed flows at kilohertz-megahertz (kHz-MHz) repetition rates without the use of added tracers. A custom-built Nd:glass femtosecond laser is used to produce 500 pulses per burst with pulses having a temporal separation as short as 1 mu s, an energy of 120 mu J, and a duration of 274 fs. This enables 2 orders of magnitude higher measurement bandwidth over conventional kHz-rate FLEET velocimetry. Characteristics of the optical system are described, along with a demonstration of time-resolved velocity measurements with similar to 0.5% precision in a supersonic slot jet. (C) 2020 Optical Society of America
引用
收藏
页码：335 / 338
页数：4
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