炮管内表面的磨损对火炮的弹道学性能有决定性的影响，其磨损状态的检测对火炮的使用、维护和寿命评估也有重要作用。
The wear condition of the artillery pipe is decisive to ballistic performance of the artillery and its detection is important to the using, maintenance and life evaluation.
当这些弹丸飞离炮管和枪管时刻，每一枚都会有了自己的弹道（抛物线）和不同的速率。
When these balls leave the barrel of a cannon or rifle they have an associated trajectory, velocity and so on and so forth.
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