论文部分内容阅读
燃烧驱动氟化氢化学激光体系中有一些关键基态物种(如DF等)可用于表征燃烧室工作状态,为了控制HF振动激发态的弛豫过程还需要加入少量的碰撞伴侣物种(如SF6、NH3、H2O等),另一些关键物种(如NF(a)等)则可能会与HF振动激发态发生传能过程,然而不幸的是这些物种的吸收较小。为了利用吸收光谱对这些弱吸收的关键基态物种进行研究,建立了基于离轴式布局的腔增强吸收光谱装置,该装置由光源部分、谐振腔部分和光电接收部分组成,其中谐振腔部分处于真空仓内。为了验证该装置的性能,测量了痕量氨气和水汽的吸收光谱。实验结果表明:该装置的等噪声吸收系数达到了1.6×10-8cm-1,表明该装置可以用于氟化氢化学激光器中关键痕量物种的测量诊断工作。
Some key ground state species (such as DF) in the combustion driven hydrogen fluoride chemical laser system can be used to characterize the working condition of the combustion chamber. In order to control the relaxation process of the excited state of the HF vibration, a small amount of collision partner species (SF6, NH3, H2O Etc.), while other key species (such as NF (a)) may undergo energy transfer with the excited state of HF vibration. However, the absorption of these species is unfortunate. In order to study these weakly absorbed key ground state species by absorption spectroscopy, a cavity enhanced absorption spectroscopy device based on off-axis layout is established. The device consists of a light source part, a resonator part and a photoelectric receiving part, wherein the cavity part is in a vacuum Warehouse inside. In order to verify the performance of the device, trace absorption spectra of ammonia and water were measured. The experimental results show that the equal noise absorption coefficient of the device reaches 1.6 × 10-8cm-1, which indicates that the device can be used for the measurement and diagnosis of key trace species in hydrogen fluoride chemical laser.