论文部分内容阅读
在纵波检测中,将调整仪器灵敏度的大平底计算法与试块当量法进行实验比较得出:无论何种频率的换能器,不同厚度对各种孔径相差的dB值,理论值与实测值相差1dB～2dB;而不同孔径之间相差的dB值,理论值与实测值基本重合,少数测试点的理论值略高于实测值0.5dB～1dB;当零件厚度增加时,理论值与实测值愈接近,厚度增加到一定程度时,相差的dB值可忽略不计,即计算法可完全替代试块法。
In the longitudinal wave detection, the adjustment of the instrument sensitivity of the flat-bottom calculation method and the test block equivalent method experiments were drawn: no matter what the frequency of the transducer, the different thickness of the various aperture difference between the dB, the theoretical and measured values The difference between the different aperture of the dB value, the theoretical value and the measured value basically coincide, the theoretical value of a few test points slightly higher than the measured value 0.5dB ~ 1dB; when the thickness of the part increases, the theoretical and measured values The closer the thickness increases to a certain extent, the difference between the dB value is negligible, that is, the calculation method can completely replace the test block method.