Lu Xu, Chen Yewei, Mazza Francesco, He Siyi, Li Zihan, Huang Shunlin, Wang Quanjun, Zhang Ning, Shen Bo, Wu Yuzhu, Yao Jinping, Cheng Ya
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
Light Sci Appl. 2024 Nov 25;13(1):315. doi: 10.1038/s41377-024-01598-9.
Thermometric techniques with high accuracy, fast response and ease of implementation are desirable for the study of dynamic combustion environments, transient reacting flows, and non-equilibrium plasmas. Herein, single-shot single-beam coherent Raman scattering (SS-CRS) thermometry is developed, for the first time to our knowledge, by using air lasing as a probe. We show that the air-lasing-assisted CRS signal has a high signal-to-noise ratio enabling single-shot measurements at a 1 kHz repetition rate. The SS-CRS thermometry consistently exhibits precision of <2.3% at different temperatures, but the inaccuracy grows with the increase in temperature. The high measurement repeatability, 1 kHz acquisition rate and easy-to-implement single-beam scheme are achieved thanks to the unique temporal, spectral and spatial characteristics of air lasing. This work opens a novel avenue for high-speed CRS thermometry, holding tremendous potential for fast diagnostics of transient reacting flows and plasmas.
对于动态燃烧环境、瞬态反应流和非平衡等离子体的研究而言，高精度、快速响应且易于实施的测温技术是十分理想的。在此，据我们所知，首次通过使用空气激光作为探针，开发了单次单光束相干拉曼散射（SS-CRS）测温技术。我们表明，空气激光辅助的CRS信号具有高信噪比，能够以1kHz的重复频率进行单次测量。SS-CRS测温技术在不同温度下始终表现出<2.3%的精度，但误差会随着温度的升高而增大。由于空气激光独特的时间、光谱和空间特性，实现了高测量重复性、1kHz采集速率和易于实施的单光束方案。这项工作为高速CRS测温开辟了一条新途径，在瞬态反应流和等离子体的快速诊断方面具有巨大潜力。
