... 超声波脉动测试 ultrasonic pulse velocity 超声波裂纹测试仪 Ultrasonic crack detector 超声波硬度测试机 supersonichardnesstester ...
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ultrasonic crack detector ==> 超声波探伤仪 ultrasonic cross grating ==> 超声交叉光栅 ..
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An ultrasonic detector for wall rock crack is introduced which is able to detect coal mine underground wall rock looseness range and cracks.
介绍了一种超声波围岩裂隙探测仪，可用于探测煤矿井下围岩松动范围及裂隙情况。
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