感应式线圈靶感应电势模型及其分析

Induced Electromotive Force Model and Analysis of Induction-Type Coil Target

感应式线圈靶是采用定距测时法测量弹丸运动速度常用的区截装置之一.将磁化弹丸等效为点磁偶极子,建立了其以一定速度偏离靶心穿过感应线圈靶的物理模型,运用电磁学理论,导出了磁化弹丸穿过线圈靶时产生的感应电动势的数学模型,根据此模型讨论了弹丸偏离线圈中心轴线对感应电动势过零点、过零点的斜率、感应电动势的幅值以及感应电动势极值点位置的影响,为线圈靶的合理使用提供了理论基础及一些建议.

Induction-type coil target is a common used zone-block device for measuring projectile,s velocity, which adopts chronometry in a certain distance. The magnetized projectile being equivalent to the point magnetic dipole, we establish the physical model of magnetized projectile deviating through the induced coil target in a certain speed. The electromagnetic theory being adopted, the paper deduces the mathematic model of induced electromotive force when magnetized projectile flying through the coil target. According to the model, we discuss the influence of bullet deviating from the axis of coil on zerocrossing, zero-crossing slope of induced electromotance, the induced electromotive force amplitude as well as extreme point position. And the theoretical basis and reasonable suggestion aiming at use of the coil target is put forward.