触发叶轮随发动机转速而旋转，使得转速传感器或拾波线圈产生与发动机转速和活塞位置相对应的触发电压脉冲。
The trigger wheel rotates with engine RPMs and causes the speed sensor, or pickup oil, to produce triggering voltage pulses that correspond to engine speed and piston position.
第一个传感器用来监视每次旋转时释放一次脉冲的机轴位置，该位置相当于某一活塞上止点的位置。
The first sensor monitors the camshaft position delivering one pulse per revolution which corresponds to the top-dead-centre (TDC) position of one of the pistons.
幅射瞬态脉冲波的圆形活塞声源在超声检测中得到广泛应用。
The acoustic source of plane circular pistons with the radiating transient pulse wave finds wide application in the ultrasonic inspection and test.
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