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目前电磁轨道发射装置中膛内电枢位置测量多采用B-dot磁探针。但在连续发射的模式下,电枢电流不连续,B-dot磁探针失效,需要新的测量方法检测电枢经过关键位置的时刻及运动速度。为此,根据轨道发射装置的结构特点,提出采用直接接触式测量方法。即在电枢配重中安装金属纤维,同时在绝缘隔板中沿电枢运动方向分布金属触头,金属触头与外接电源相连接;电枢运动时,其配重中的金属纤维与金属触头接触时,回路闭合,在取样电阻上获取高电平信号,该信号上升沿即为电枢位置信号。同时根据相邻电平上升沿的时间差以及所对应金属触头的间距,可以获得电枢在膛内的速度。在实际发射实验中,利用该方法准确测得发射过程中电枢的位置,及对应发射速度,且该测量有效地避免了发射过程中烟雾及弧光的影响。
At present, the measurement of armature position in the bore of the electromagnetic track launcher uses the B-dot magnetic probe. However, in continuous emission mode, the armature current is discontinuous and the B-dot magnetic probe fails. New measurement methods are needed to detect the moment and velocity of the armature passing through the key position. Therefore, according to the structure of the orbiting launcher, a direct contact measurement method is proposed. That is to say, the metal fiber is arranged in the armature counterweight, meanwhile, the metal contact is distributed along the movement direction of the armature in the insulating baffle, and the metal contact is connected with the external power supply; when the armature moves, the metal fiber in the counterweight and the metal When the contact is in contact, the circuit is closed and a high level signal is obtained on the sampling resistor. The rising edge of the signal is the armature position signal. At the same time, the speed of the armature in the bore can be obtained according to the time difference of the rising edge of the adjacent level and the distance between the corresponding metal contacts. In the actual launching experiment, the position of the armature and its corresponding launching speed during launching are accurately measured by this method. And this measure effectively avoids the influence of smoke and arc during the launching process.