In 1987 when Discovery Channel's now-famous Shark Week series debuted, researchers had few means of studying the animals beyond underwater cages and crude acoustictracking devices.
Tracking target by using anti-helicopter mine (AHM) is actually the bearing-only measurement because precision of range detected by passive acoustic measurement cant satisfy the need of tracking.
Based upon the influence of a gap on the propagation of the acoustic emission waves, thedesigning of the weld seam tracking system with an acoustic-emission-microcontroller is described.