Internal structure of laser supported detonation waves by two-wavelength Mach–Zehnder interferometer
Internal structure of laser supported detonation waves by two-wavelength Mach–Zehnder interferometer
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DOI：
10.1063/1.3574922
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发表时间：
2011-04
影响因子：
3.2
通讯作者：
K. Shimamura;Keigo Hatai;Koichi Kawamura;A. Fukui;A. Fukuda;Bin Wang-;Toshikazu Yamaguchi;K. Komurasaki;Y. Arakawa
中科院分区：
文献类型：
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作者：
K. Shimamura;Keigo Hatai;Koichi Kawamura;A. Fukui;A. Fukuda;Bin Wang-;Toshikazu Yamaguchi;K. Komurasaki;Y. Arakawa
利用双波长马赫-曾德尔干涉仪沿着发射光谱仪测量了激光支持爆轰波（LSD）的内部结构特征，如冲击波后的电子密度ne和电子温度Te分布。能量为10 J/脉冲的TEA CO_2激光器在大气中产生爆炸性激光加热。结果表明，在LSD区，ne和Te的峰值分别约为2 × 1024 m−3和30 000 K。激光吸收系数分布的时间变化估计从测量的属性显示，激光能量被完全吸收在后面的冲击波在LSD制度的薄层，如雷泽的LSD模型预测。然而，吸收层比等离子体层薄得多，Raizer的模型中没有考虑这种情况。当支持LSD时，在激波前沿测得的ne不为零，这意味着在激波前沿存在前驱电子。
Characteristics of the internal structure of the laser supported detonation (LSD) waves, such as the electron density ne and the electron temperature Te profiles behind the shock wave were measured using a two-wavelength Mach–Zehnder interferometer along with emission spectroscopy. A TEA CO2 laser with energy of 10 J/pulse produced explosive laser heating in atmospheric air. Results show that the peak values of ne and Te were, respectively, about 2 × 1024 m−3 and 30 000 K, during the LSD regime. The temporal variation of the laser absorption coefficient profile estimated from the measured properties reveals that the laser energy was absorbed perfectly in a thin layer behind the shock wave during the LSD regime, as predicted by Raizer’s LSD model. However, the absorption layer was much thinner than a plasma layer, the situation of which was not considered in Raizer’s model. The measured ne at the shock front was not zero while the LSD was supported, which implies that the precursor electrons exist ahead of...