Number density measurement in high temperature flows and clarification of their non-equilibrium internal states

本研究以电感耦合等离子体为真空紫外光源，研制了真空紫外吸收光谱分析系统。结合激光吸收光谱测温，数密度测量的精度提高了一个数量级以上，双管电感耦合等离子体源的测量范围扩展到五个数量级。最后，利用电感耦合等离子体光泵浦基态实现了布居反转，验证了两级吸收光谱的可行性。

In this study, vacuum ultraviolet absorption spectroscopy system was developed using inductively coupled plasma as a VUV light source. The accuracy of the number density measurement was enhanced more than one order of magnitude combined with the temperature measurement by laser absorption spectroscopy and the measurablerange was expanded to five orders of magnitude using a dual tube ICP source. Finally, the population inversion was realized by pumping the ground state by the ICP light, which shows feasibility of the two stage absorption spectroscopy.