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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。
This article describes the structure and working principle of 8mm and 3mm microwave fringe interferometers. Microwave stripe interferometer has high measurement sensitivity and accuracy (one or two orders of magnitude higher than conventional transilluminator and reflectometer) and good anti-interference ability, so it is a reliable measure of electron density in plasma . In the air of P_1 = 1 × 10 -2 -2 mmHg Ma_s = 9-22.5, the measurement results of the fringe interferometer in this paper are consistent with what the author previously measured by other means. Based on the results measured by various means within this broad range, we obtain the approximate relationship of n_eαP_1 under the same Ma_s. This law is in line with the result of theoretical calculations. In this paper, the fringe interferometer is used in combination with a transilluminator to measure the average collision cross section of slow electrons and neutrals at some temperatures.