Abstract
The objective of this work is to investigate the ability of transient-grating spectroscopy (TGS) to measure accurately the acoustic damping rate by analyzing the temporal behavior of laser-induced gratings. Experiments are performed in a binary gaseous mixture, with a trace amount of NO 2, as a function of both composition and pressure. Measured and theoretically calculated acoustic damping rates are compared using both a classical model and a more comprehensive model that included additional diffusive mechanisms. The TGS technique demonstrated here provides a nearly instantaneous measurement with reasonably high spatial resolution. The experimental data agree well with theoretical predictions.
Original language | English (US) |
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Pages (from-to) | 687-693 |
Number of pages | 7 |
Journal | Experiments in Fluids |
Volume | 39 |
Issue number | 4 |
DOIs | |
State | Published - Oct 1 2005 |
Externally published | Yes |
Keywords
- Acoustic dissipation
- Laser-induced thermal acoustics
- Optical diagnostics
- Transient-grating spectroscopy
ASJC Scopus subject areas
- Computational Mechanics
- Mechanics of Materials
- General Physics and Astronomy
- Fluid Flow and Transfer Processes