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首页> 外文会议>G-MTT International Symposium Digest, 1966 >Application of a Microwave Technique to the Measurement of Electron Density and Relaxation Time
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Application of a Microwave Technique to the Measurement of Electron Density and Relaxation Time

机译：微波技术在电子密度和弛豫时间测量中的应用

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The measurement of ionization rate and electron densities in thermally ionized gases attracted the attention of many scientists and engineers working in the aerospace field. Determination of these parameters is of importance not only in the field of communication with reentering bodies, but is also of vital importance in understanding combustion and other rapid chemical reactions. Initial ionization is usually attributed to collisions between molecules, but as the electron density increases, collisions between electrons and neutral particles may also become important or even dominant in the ionization process. Depending on the efficiency of molecular collision processes, on the physical and chemical properties of the gas and its purity, a time lag or relaxation time will result between the heating of the neutral gas and the attainment of equilibrium electron density. Since in a shock tube, samples of gas can rapidly be heated to temperatures in excess of 104 ° K without introducing an excess of impurities, this kind of device is ideally suited for the above-mentioned studies.
机译：热电离气体中电离速率和电子密度的测量吸引了许多航空航天领域的科学家和工程师的注意。这些参数的确定不仅在与再入体的连通领域中很重要，而且对于理解燃烧和其他快速化学反应也至关重要。初始电离通常归因于分子之间的碰撞，但是随着电子密度的增加，电子与中性粒子之间的碰撞在电离过程中也可能变得重要甚至占主导地位。取决于分子碰撞过程的效率，取决于气体的物理和化学性质及其纯度，在中性气体的加热与达到平衡电子密度之间会出现时间滞后或弛豫时间。由于在冲击管中，气体样本可以迅速加热到超过10 4 °K的温度而不会引入过量的杂质，因此这种设备非常适合上述研究。

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