Quantitative measurement of the mixture ratio for ADN-based liquid propellants using laser-induced breakdown spectroscopy,Journal of Analytical Atomic Spectrometry

当前位置： X-MOL 学术 › J. Anal. At. Spectrom. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Quantitative measurement of the mixture ratio for ADN-based liquid propellants using laser-induced breakdown spectroscopy
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2021-07-21 , DOI: 10.1039/d1ja00186h
Fangyi Wang _{1,

2} , Shaohua Zhang ₁ , Xilong Yu _{1,

2} , Xin Lin ₁ , Jing Li _{3,

4} , Yan Liu _{3,

4}

Affiliation

Laser-induced breakdown spectroscopy (LIBS) experiments were carried out with an ammonium dinitramide (ADN)-based propellant to measure its distribution, that is the mixture ratio, in an inert atmosphere. A heating sampler was developed to produce a premixed sample with a known mixture ratio and this was connected to a chamber that had been designed to simulate the space propulsion environment. Determining the time window for the acquisition and saturation threshold of LIBS were the main motivations to investigate the effective lifetimes of atomic spectral lines and the effect of laser energy on the emission ratio. From the spectroscopic analysis, it was found that the ratio of the intensities of H (656.3 nm), O (777 nm) and N (746.8 nm) over Ar (738.4 nm) increased monotonically with the mixture ratio in the range of 0–0.06. A series of propellant/Ar mixtures with a pressure in the region of 40–100 kPa were used to obtain a linear correlation between the intensity ratio of LIBS spectra and the local mixture ratio. It was observed that the logarithm of the slope of the lines also showed a linear correlation with the pressure. Considering that the current method was applied by necessity with the given pressure, the local pressure was studied based on its dependence on the full width at half maximum (FWHM) of H and Ar spectral lines. Consequently, the emission ratios of H/Ar, O/Ar and N/Ar were utilized as a diagnostic tool to obtain the distribution of the propellant in the inert atmosphere. The LIBS-based results not only provide fundamental data for the on-line measurements of ADN-based thrusters, but also hold promise for promoting the application of LIBS in the field of energetic ionic liquids.

中文翻译：

使用激光诱导击穿光谱法定量测量基于 ADN 的液体推进剂的混合比

使用基于二硝胺 (ADN) 的推进剂进行激光诱导击穿光谱 (LIBS) 实验，以测量其在惰性气氛中的分布，即混合比。开发了加热采样器以产生具有已知混合比的预混样品，并将其连接到设计用于模拟空间推进环境的腔室。确定 LIBS 采集和饱和阈值的时间窗口是研究原子谱线有效寿命和激光能量对发射率影响的主要动机。从光谱分析中发现，H (656.3 nm)、O (777 nm) 和 N (746.8 nm) 与 Ar (738.4 nm) 的强度之比随着混合比在 0– 0.06。使用压力在 40-100 kPa 范围内的一系列推进剂/Ar 混合物来获得 LIBS 光谱强度比与局部混合比之间的线性相关性。观察到线的斜率的对数也显示出与压力的线性相关性。考虑到当前方法是在给定压力下必要应用的，基于局部压力对 H 和 Ar 谱线的半峰全宽 (FWHM) 的依赖性进行了研究。因此，H/Ar、O/Ar 和 N/Ar 的排放比被用作诊断工具，以获得惰性气氛中推进剂的分布。基于 LIBS 的结果不仅为基于 ADN 的推进器的在线测量提供了基础数据，

更新日期：2021-08-16

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11