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本文从实际出发,试用缺陷端部最大讯号测定了人工缺陷和实际裂纹缺陷的高度、宽度和长度。鉴于缺陷端部曲折多样,声束有一定的宽度,其间的相互作用比较复杂,提出了判定端部最大讯号的两种办法:即运用动态波形法鉴别缺陷的端部最大讯号;运用基准灵敏度,在其上部区域挑选缺陷端部峰值讯号为缺陷端部最大讯号。实际测试结果表明:当探测声程约150毫米时,用一般商用探头探测,测试误差一般在±3～5毫米范围之内;用声束宽度较窄的探头探测,测试误差能控制在±3毫米范围内。测试误差随声程之增大而增大,随声束宽度之变窄而减小。测试表明:运用缺陷端部最大讯号确定缺陷的大小是可行的。
Based on the actual situation, this paper measured the height, width and length of the artificial defects and the actual crack defects by testing the maximum signal of the end of the defects. In view of the variety of defects, the sound beam has a certain width and the interaction between them is quite complicated, two methods are proposed to determine the maximum signal at the end: the dynamic waveform method is used to identify the maximum signal at the end of the defect; the reference sensitivity, In the upper region of the selected defect end of the peak signal is the largest end of the defect signal. The actual test results show that: when the probe sound path is about 150 mm, using a common commercial probe detection, the test error is generally within the range of ± 3 ~ 5 mm; probe with a narrow beam width of the probe, the test error can be controlled at ± 3 Mm range. The test error increases with the increase of the sound path and decreases with the narrowing of the beam width. The test shows that it is feasible to determine the size of the defect by using the maximum signal of the flaw end.