空气呼吸模式激光推进实验研究

介绍了利用实验室自行研制的紫外预电离 TEA CO2激光器进行的金属线导引抛物面光船垂直推进实验,脉冲能量 60 J 时,冲量耦合系数可达到 390 N/MW。这一结果远高于 Myrabo 和 Schall 等人用电子束维持放电激光器获得的空气呼吸模式冲量耦合系数。还介绍了利用光电二极管探测 He-Ne 激光束,He-Ne 激光束强度变化反映了空气呼吸模式激光推进时空气密度变化,进而观察了激光束照射光船后空气扰动的情况。

飘香的爆米花

在我童年的记忆里，家乡是个美丽的童话。无论是夕阳下袅袅的炊烟，还是夏夜挑着灯笼的萤火虫，都给我无忧无虑的童年带来了欢乐。其中，最让我难忘的是喷香的爆米花。小时候，我是一个不折不扣的馋嘴猫，爆米花是我的最爱。每当听到村子里传来“嘭--”的一声闷响，闻到弥漫在空气中的玉米香味，我就会马上央求妈妈去爆玉米花。妈妈就会盛上满满一瓢金黄的玉米粒，向村子里走去，我雀跃地跟在后面。

Experimental Research on Plasma Induced by TEA CO_2 Laser Propulsion

Results in the air-breathing propulsion experiments with a parabolic light craft and a self-made UV-preionized 100 J TEA CO2 laser device are presented. Air disturbance and the spectrum of the plasma after the interaction of pulsed laser radiation with the light craft were studied. It was found that the focal length of the parabolic light craft had a significant effect on the air-disturbance. Two shock waves were detected for the longer focal length, while only one shock wave detected for the short focal length. The spectrum of the laser-induced plasma, the distribution of the characteristic lines, and the temporal behaviors of the air plasma were studied in detail. The results showed that, the evolution of the laser-induced plasma lasted 20μs, and the plasma spectrum would reach the maximum intensity at 7μs.

飘香的爆米花

记忆里，家乡一直是个美丽的童话。无论是夕阳下袅袅的炊烟，还是夏夜挑着灯笼的萤火虫，都使我无忧无虑的童年莎漾着欢乐。其中，最难忘的是喷香的爆米花。小时候，我是一个不折不扣的“馋嘴猫”，爆米花是我的最爱。每当听到村子里传来“嘭——”的一声闷响，闻到弥漫在空气中的玉米香味，我就会马上央求妈妈去爆玉米花。妈妈就会用瓢盛上满满的金黄的玉米粒，向村子里走去，我雀跃地跟在后面。