Ultrasonic flaw location in semisphere butt welds by sound path method is described.

介绍半球对接焊缝超声探伤的声程定位方法.

The adjustable coupling effect of plastic fiber dual taper and semisphere medium cavity implemented by using He Ne laser is reported.

报道了用氦氖激光实现的塑料光纤双锥与介质半球（称半球腔）之间的活动耦合效应。