Time-resolved gas thermometry by laser-induced grating spectroscopy with a high-repetition rate laser system
Time-resolved gas thermometry by laser-induced grating spectroscopy with a high-repetition rate laser system
复制标题
采用高重复率激光系统的激光诱导光栅光谱法进行时间分辨气体测温
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
P. Ewart
中科院分区：
文献类型：
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作者：
F. Förster;C. Crua;M. Davy;P. Ewart
测温使用激光诱导光栅光谱（LIGS）的报告使用高重复率激光系统，扩展技术，允许时间分辨的气体动力学测量。使用市售高重复率Nd：YAG激光器在532 nm处的二次谐波输出产生LIGS信号，其中二氧化氮作为分子种子。在静态电池条件下，以高达10 kHz的速率进行测量。在1kHz下记录通过注入气体而经受快速压缩的电池中所含的相同气体的瞬态温度变化，以导出压缩气体的温度演变，该温度演变在0.1s的时间尺度上显示50K的温度变化，测量精度为1.4%。数据显示出良好的协议与压缩过程的分析热力学模型。
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.