Journal
EXPERIMENTS IN FLUIDS
Volume 58, Issue 7, Pages -Publisher
SPRINGER
DOI: 10.1007/s00348-017-2370-6
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Funding
- Engineering and Physical Sciences Research Council (EPSRC), UK [EP/M009424/1]
- Engineering and Physical Sciences Research Council [EP/M009424/1] Funding Source: researchfish
- EPSRC [EP/M009424/1] Funding Source: UKRI
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Thermometry using laser-induced grating spectroscopy (LIGS) is reported using a high-repetition rate laser system, extending the technique to allow time-resolved measurements of gas dynamics. LIGS signals were generated using the second harmonic output at 532 nm of a commercially available high-repetition rate Nd:YAG laser with nitrogen dioxide as molecular seed. Measurements at rates up to 10 kHz were demonstrated under static cell conditions. Transient temperature changes of the same gas contained in a cell subjected to rapid compression by injection of gas were recorded at 1 kHz to derive the temperature evolution of the compressed gas showing temperature changes of 50 K on a time-scale of 0.1 s with a measurement precision of 1.4%. The data showed good agreement with an analytical thermodynamic model of the compression process.
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