排序方式: 共有16条查询结果,搜索用时 93 毫秒
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爆轰驱动过程中产生的高温高压气流对铝质膜片、激波管壁产生烧蚀和冲刷作用,以致激波管壁、端盖上附有氧化铝等杂质,而高温下AlO自由基在气体分子的高速碰撞下被激发并产生强烈的辐射,从而干扰了高温气体辐射光谱的分析。用爆轰驱动加热技术将空气加热到4 000~7 000 K,利用多通道光学分析仪对AlO自由基辐射光谱进行分析,实验发现在460~530 nm波长范围内有多支辐射非常强烈的AlO自由基B2Σ+-X2Σ+(T00=20 689 cm-1)带系辐射谱带,且每支谱带都由多个带头组成,带头间隔约为2 nm,带头处于高频位置并向低频方向伸延。通过实验与理论计算相结合,重点分析了AlO自由基B2Σ+-X2Σ+带系辐射光谱的结构特征。AlO自由基C2Πr-X2Σ+(T00=33 047 cm-1)带系辐射光谱处于270~335 nm波长范围内,其辐射强度相对于B2Σ+-X2Σ+带系较弱,并且与OH基A2Σ+-X2Π(T00=32 682 cm-1)带系辐射光谱互相干扰而难以分辨,对该波段高温空气的辐射光谱分析产生不利的影响。 相似文献
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微波条纹干涉仪用于激波管中电离现象的研究 总被引:1,自引:0,他引:1
本文介绍了8mm和3mm微波条纹干涉仪的结构和工作原理。微波条纹干涉仪具有高的测量灵敏度和精度(比普通透射仪和反射仪高一、两个量级),又有好的抗干扰能力,因此它是测量等离子体中电子密度的一种可靠手段。在P_1=1×10~(-2)—1mmHg Ma_s=9—22.5范围内的空气中,本文条纹干涉仪的测量结果与作者以前用其它手段测量的结果是一致的。根据这一宽阔范围内各种手段测量的结果,我们得到了在同一Ma_s下,n_e∝P_1的近似关系。这一规律与理论计算的结果也是符合的。本文将条纹干涉仪与透射仪联合使用,测定了在某些温度下慢电子与中性粒子的平均碰撞截面。 相似文献
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介绍JF-10氢氧爆轰驱动激波风洞自由流中NO的诊断技术及其实验结果.这里使用的是新研制的紫外波段的动态吸收光谱测量系统.该系统以Te元素空心阴极灯为光源,以OMAIV为探测设备,通过标定,获得一氧化氮 γ带系 对 Te两条谱线214nm和 225nm的吸收特性,得到在 NO低含量时对两条谱线的吸收系数差别很大并呈非线性的特点.利用这两条谱线吸收系数的差值,用“差比法”对新建的高烙爆轰驱动激波风洞中自由流 NO含量进行了诊断.实验结果表明,在总温 8500 K、总压21.6MPa时NO含量甚微,小于 4×1014分子/cm3.这一结果说明该风洞自由流处于化学准平衡状态. 相似文献
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This paper presents the electromagnetic wave propagation characteristics in plasma and the attenuation coefficients of the microwave in terms of the parameters he, v, w, L, wb. The φ800 mm high temperature shock tube has been used to produce a uniform plasma. In order to get the attenuation of the electromagnetic wave through the plasma behind a shock wave, the microwave transmission has been used to measure the relative change of the wave power. The working frequency is f = (2-35)GHz (ω=2πf, wave length A =15cm-8mm). The electron density in the plasma is ne = (3×10^10-1×10^14) cm^-3. The collision frequency v = (1×10^8-6×10^10) Hz. The thickness of the plasma layer L = (2-80)cm. The electron circular frequency ωb=eBo/me, magnetic flux density B0 = (0-0.84)T. The experimental results show that when the plasma layer is thick (such as L/λ≥10), the correlation between the attenuation coefficients of the electromagnetic waves and the parameters ne,v,ω, L determined from the measurements are in good agreement with the theoretical predictions of electromagnetic wave propagations in the uniform infinite plasma. When the plasma layer is thin (such as when both L and A are of the same order), the theoretical results are only in a qualitative agreement with the experimental observations in the present parameter range, but the formula of the electromagnetic wave propagation theory in an uniform infinite plasma can not be used for quantitative computations of the correlation between the attenuation coefficients and the parameters ne,v,ω, L. In fact, if ω<ωp, v^2<<ω^2, the power attenuations K of the electromagnetic waves obtained from the measurements in the thin-layer plasma are much smaller than those of the theoretical predictions. On the other hand, if ω>ωp, v^2<<ω^2 (just v≈f), the measurements are much larger than the theoretical results. Also, we have measured the electromagnetic wave power attenuation value under the magnetic field and without a magnetic field. The result indicates that the value measured under the magnetic field shows a distinct improvement. 相似文献
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爆轰驱动过程中产生的高温高压气流对铝质膜片、激波管壁产生烧蚀和冲刷作用,以致激波管壁、端盖上附有氧化铝等杂质,而高温下AlO自由基在气体分子的高速碰撞下被激发并产生强烈的辐射,从而干扰了高温气体辐射光谱的分析.用爆轰驱动加热技术将空气加热到4 000~7 000 K,利用多通道光学分析仪对AlO自由基辐射光谱进行分析,实验发现在460~530 nm波长范围内有多支辐射非常强烈的AlO自由基B~2∑~+-X~2∑~+(T_(00)=20 689 cm~(-1))带系辐射谱带,且每支谱带都由多个带头组成,带头间隔约为2 mn,带头处于高频位置并向低频方向伸延.通过实验与理论计算相结合,重点分析了AlO自由基B~2∑~+-X~2∑~+带系辐射光谱的结构特征.AlO自由基C~2∏_r-X~2∑~+(T_(00)=33 047 cm~(-1))带系辐射光谱处于270~335 nm波长范围内,其辐射强度相对于B~2∑~+-X~2∑~+带系较弱,并且与OH基A~2∑~+-X~2∏(T_(00)=32 682 cm~(-1))带系辐射光谱互相干扰而难以分辨,对该波段高温空气的辐射光谱分析产生不利的影响. 相似文献
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The experimental results for the excited time of the nonequlibrium radiation and the ionization behind strong shock waves
are presented. Using an optical multichannel analyzer, InSb infrared detectors and near-free-molecular Langmuir probes, the
infrared radiation, the electron density of air and the nonequlibrium radiation spectra at different moments of the relaxation
process in nitrogen test gas behind normal shock waves were obtained, respectively, in hydrogen oxygen combustion driven shock
tubes.
The project supported by the National Natural Science Foundation of China (19982005 and 10032050), and the National Defense
Science Foundation of China (95JBA4.2ZK0402) 相似文献