Tracer-free laser-induced grating spectroscopy using a pulse burst laser at 100 kHz
AuthorsDomenico, Francesca D.E.
Roberts, William L.
KAUST DepartmentClean Combustion Research Center
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
high-pressure combustion (HPC) Research Group
Permanent link to this recordhttp://hdl.handle.net/10754/660318
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AbstractThis work shows the first application of a burst laser for laser-induced grating spectroscopy (LIGS) diagnostics. High repetition rate (100 kHz) LIGS is performed in non reacting and reacting flows using the fundamental harmonic of a Nd:YAG pulse-burst laser as pump. In the first part of the paper, we demonstrate the first time-resolved, high repetition rate electrostrictive LIGS measurements in a sinusoidally-modulated helium jet, allowed by the highly energetic pulses delivered by the burst laser (around 130 mJ per pulse). In the second part of the paper, we perform thermal LIGS measurements in a premixed laminar methane/air flame. Thermal gratings are generated in the flame products from the water vapour, which weakly absorbs 1064 nm light. Thus, this work demonstrates the potential of seeding-free high repetition rate LIGS as a technique to detect and time-resolve the instantaneous speed of sound, temperature, and composition in unsteady flow processes.
CitationDe Domenico, F., Guiberti, T. F., Hochgreb, S., Roberts, W. L., & Magnotti, G. (2019). Tracer-free laser-induced grating spectroscopy using a pulse burst laser at 100 kHz. Optics Express, 27(22), 31217. doi:10.1364/oe.27.031217
SponsorsKing Abdullah University of Science and Technology; Engineering and Physical Sciences Research Council (EP/K02924X); KAUST visting students program; University of Cambridge.
PublisherThe Optical Society
Except where otherwise noted, this item's license is described as Archived with thanks to Optics Express