近日，中国科学院上海光学精密机械研究所的姚金平及其研究团队取得一项新进展。经过不懈努力，他们基于光诱导空气激光实现单发单光束相干拉曼散射测温。相关研究成果已于2024年11月25日在国际知名学术期刊《光：科学与应用》上发表。

本研究首次开发了基于空气激光作为探测手段的单发单束相干拉曼散射（SS-CRS）测温技术。研究证明，空气激光辅助的CRS信号具有高信噪比，能够在1kHz的重复率下实现单次测量。SS-CRS测温技术在不同温度下均表现出小于2.3%的精度，但随着温度的升高，误差会增大。

得益于空气激光独特的时域、频域和空域特性，该技术实现了高测量重复性、1kHz的采集速率以及易于实施的单束方案。这项工作为高速CRS测温技术开辟了一条新途径，对瞬态反应流和等离子体的快速诊断具有巨大潜力。

据悉，在研究动态燃烧环境、瞬态反应流和非平衡等离子体时，需要高精度、快速响应且易于实施的温度测量技术。

附：英文原文

Title: Single-shot single-beam coherent Raman scattering thermometry based on optically induced air lasing

Author: Lu, Xu, Chen, Yewei, Mazza, Francesco, He, Siyi, Li, Zihan, Huang, Shunlin, Wang, Quanjun, Zhang, Ning, Shen, Bo, Wu, Yuzhu, Yao, Jinping, Cheng, Ya

Issue&Volume: 2024-11-25

Abstract: 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 1kHz 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, 1kHz 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.

DOI: 10.1038/s41377-024-01598-9

Source: https://www.nature.com/articles/s41377-024-01598-9