SHOCK LAYER OPTICAL ATTENUATION AND EMISSION SPECTROSCOPY MEASUREMENTS DURING ARC JET TESTING WITH ABLATING MODELS
SHOCK LAYER OPTICAL ATTENUATION AND EMISSION SPECTROSCOPY MEASUREMENTS DURING ARC JET TESTING WITH ABLATING MODELS
复制标题
使用烧蚀模型进行电弧喷射测试期间的冲击层光学衰减和发射光谱测量
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
D. Driver
中科院分区：
文献类型：
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作者：
G. Raiche;D. Driver
本文报道了几种烧蚀电弧射流试验模型上游辐射弓形激波区的光学衰减和发射光谱的测量结果。衰减测量的目的是评估光传输平行于模型面在k633 nm的冲击层形成的烧蚀表面;衰减是由于存在的颗粒。当模型烧蚀时，表面后退，有效地将检测视线从模型表面向上游平移。大量的传输损失与宏观烧蚀和表面加热率，并持续上游的冲击波阵面。同时，在与衰减激光器相同的平面中测量光发射光谱。这些测量旨在确定烧蚀产物（颗粒或蒸汽）影响弓形激波辐射的程度。光谱测量迅速使用微型固定光栅光谱仪与光纤输入。在2 mm的视场和小于100 ms的采集时间下，保持了空间分辨率，并观察到时间依赖性强度趋势。离解空气的几种成分可以根据它们的光谱特征来识别;然而，烧蚀产物的辐射贡献似乎很小。
Measurements of optical attenuation and emission spectra for the radiating bow shock region upstream of several ablating arc jet test models are reported. Attenuation measurements were intended to assess light transmission parallel to the model face at k633 nm by the shock layer formed over the ablating surface; the attenuation is attributed to the presence of particles. As the models ablated, the surface receded, effectively translating the detection line of sight upstream from the model surface. Substantial loss of transmission correlated with the macroscopic ablation and surface heating rates, and persisted upstream of the shock front. Simultaneously, optical emission spectra were measured in the same plane as the attenuation laser. These measurements were intended to determine the extent to which ablation products (particles or vapor) influence the bow shock radiation. The spectra were measured rapidly using miniature fixed-grating spectrometers with fiber optic input. With a field of view of 2 mm and acquisition time less than 100 ms, spatial resolution was retained and time dependent intensity trends were observed. Several components of dissociated air can be identified based on their spectral signatures; the radiative contribution by ablation products appears minor, however.