Tracer-free laser-induced grating spectroscopy using a pulse burst laser at 100 kHz
Tracer-free laser-induced grating spectroscopy using a pulse burst laser at 100 kHz
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DOI：
10.1364/oe.27.031217
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发表时间：
2019-10-28
期刊：
影响因子：
3.8
通讯作者：
Magnotti, Gaetano
中科院分区：
文献类型：
--
作者：
De Domenico, Francesca;Guiberti, Thibault F.;Magnotti, Gaetano
这项工作显示了第一个应用程序的突发激光的激光诱导光栅光谱（LIGS）诊断。利用Nd：YAG脉冲群激光器的基波作为泵浦源，在非反应流和反应流中进行了高重复频率（100 kHz）的LIGS实验。在本文的第一部分中，我们展示了第一时间分辨，高重复率的电致伸缩LIGS测量在正弦调制的氦射流，允许由高能量脉冲提供的突发激光（约130毫焦耳每脉冲）。在本文的第二部分中，我们进行了热LIGS测量在一个预混层流甲烷/空气火焰。热光栅产生于火焰产物中的水蒸气，其微弱地吸收1064 nm的光。因此，这项工作表明了潜在的种子免费高重复率LIGS作为一种技术来检测和时间分辨的瞬时速度的声音，温度和成分在不稳定的流动过程。由The Optical Society根据Creative Commons Attribution 4.0 License条款发布。
This work shows the first application of a burst laser for laser-induced grating spectroscopy (LIGS) diagnostics. High repetition rate (100 kHz) LIGS is performed in non reacting and reacting flows using the fundamental harmonic of a Nd:YAG pulse-burst laser as pump. In the first part of the paper, we demonstrate the first time-resolved, high repetition rate electrostrictive LIGS measurements in a sinusoidally-modulated helium jet, allowed by the highly energetic pulses delivered by the burst laser (around 130 mJ per pulse). In the second part of the paper, we perform thermal LIGS measurements in a premixed laminar methane/air flame. Thermal gratings are generated in the flame products from the water vapour, which weakly absorbs 1064 nm light. Thus, this work demonstrates the potential of seeding-free high repetition rate LIGS as a technique to detect and time-resolve the instantaneous speed of sound, temperature, and composition in unsteady flow processes. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.