The efficacy of spacecraft propulsion systems significantly depends on the choice of propellant.This study utilized laser-induced breakdown spectroscopy(LIBS)to investigate the impact of different fuel types,fuel rati...The efficacy of spacecraft propulsion systems significantly depends on the choice of propellant.This study utilized laser-induced breakdown spectroscopy(LIBS)to investigate the impact of different fuel types,fuel ratios,and laser energies on the plasma parameters of ammonium dinitramide(ADN)-based liquid propellants.Our findings suggest that 1-allyl-3-methylimidazolium dicyanamide(AMIMDCA)as a fuel choice led to higher plasma temperatures compared to methanol(CH_3OH)and hydroxyethyl hydrazine nitrate(HEHN)under the same experimental conditions.Optimization of the fuel ratio proved critical,and when the AMIMDCA ratio was 21wt.%the propellants could achieve the best propulsion performance.Increasing the incident laser energy not only enhanced the emission spectral intensity but also elevated the plasma temperature and electron density,thereby improving ablation efficiency.Notably,a combination of 100 mJ laser energy and 21wt.%AMIMDCA fuel produced a strong and stable plasma signal.This study contributes to our knowledge of pulsed laser micro-ablation in ADN-based liquid propellants,providing a useful optical diagnostic approach that can help refine the design and enhance the performance of spacecraft propulsion systems.展开更多
以提高激光诱导击穿光谱(LIBS)检测奶粉中重金属Cr元素精确性为研究目的,采用集成ICCD光谱仪的LIBS系统对奶粉样品中等离子体信号进行采集。为了减小检测误差,首先用洛伦兹(Lorentz)拟合对光谱谱线轮廓进行预处理,提取光谱净强度值。在...以提高激光诱导击穿光谱(LIBS)检测奶粉中重金属Cr元素精确性为研究目的,采用集成ICCD光谱仪的LIBS系统对奶粉样品中等离子体信号进行采集。为了减小检测误差,首先用洛伦兹(Lorentz)拟合对光谱谱线轮廓进行预处理,提取光谱净强度值。在相同的试验条件下,以Cr I 425.43 nm作为分析线、Ca I 422.67 nm作为内标线,分别采用外标法和内标法对奶粉中的Cr元素进行了定量分析,两种定标曲线的线性系数分别为0.946 52和0.991。实验结果表明,选取奶粉中基体元素Ca作为内标物质能有效提高定标曲线的拟合效果,减少误差,为将来采用内标法建模应用于便携式LIBS技术检测食品提供了参考。展开更多
文摘The efficacy of spacecraft propulsion systems significantly depends on the choice of propellant.This study utilized laser-induced breakdown spectroscopy(LIBS)to investigate the impact of different fuel types,fuel ratios,and laser energies on the plasma parameters of ammonium dinitramide(ADN)-based liquid propellants.Our findings suggest that 1-allyl-3-methylimidazolium dicyanamide(AMIMDCA)as a fuel choice led to higher plasma temperatures compared to methanol(CH_3OH)and hydroxyethyl hydrazine nitrate(HEHN)under the same experimental conditions.Optimization of the fuel ratio proved critical,and when the AMIMDCA ratio was 21wt.%the propellants could achieve the best propulsion performance.Increasing the incident laser energy not only enhanced the emission spectral intensity but also elevated the plasma temperature and electron density,thereby improving ablation efficiency.Notably,a combination of 100 mJ laser energy and 21wt.%AMIMDCA fuel produced a strong and stable plasma signal.This study contributes to our knowledge of pulsed laser micro-ablation in ADN-based liquid propellants,providing a useful optical diagnostic approach that can help refine the design and enhance the performance of spacecraft propulsion systems.
基金National Key R&D Program of China(2016YFD0800902-2),the Anhui Province Major Science and Technology Projects(16030801117),and the National High-Tec hnology Research and Development Program of China(2014AA06A513)。
文摘以提高激光诱导击穿光谱(LIBS)检测奶粉中重金属Cr元素精确性为研究目的,采用集成ICCD光谱仪的LIBS系统对奶粉样品中等离子体信号进行采集。为了减小检测误差,首先用洛伦兹(Lorentz)拟合对光谱谱线轮廓进行预处理,提取光谱净强度值。在相同的试验条件下,以Cr I 425.43 nm作为分析线、Ca I 422.67 nm作为内标线,分别采用外标法和内标法对奶粉中的Cr元素进行了定量分析,两种定标曲线的线性系数分别为0.946 52和0.991。实验结果表明,选取奶粉中基体元素Ca作为内标物质能有效提高定标曲线的拟合效果,减少误差,为将来采用内标法建模应用于便携式LIBS技术检测食品提供了参考。
