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大直径钢管的内外直径是必须测量的项目,日本NKK公司福山制铁所采用超声波表面波在钢管表面圆周方向经过一周的传播时间,就可以测出钢管的内、外直径。据此原理制造出手提式表面波钢管
Inside and outside the diameter of large diameter steel pipe is the project must be measured, Japan’s NKK Fukuyama Iron and Steel Company using ultrasonic surface wave in the circumferential direction of the steel surface after a week of propagation time, you can measure the pipe diameter. According to this principle to create a portable surface wave steel pipe