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材料对超声波的衰减是影响超声波探伤仪检测能力的主要因素之一。它不但会使有用的反射波信号淹没在噪声中,造成信号检出困难,还会使处于不同深度的缺陷所产生的反射波不具有一致性,导致对缺陷的错误判断。本文采用深度增益补偿(DGC)电压解决这个问题。将预先设计好的DGC电压曲线存储在存储器中,在探伤仪接收反射超声波时,通过对存储器的寻址操作读取DGC电压,经过D/A转换后对放大器的增益进行控制,从而实现对反射波的补偿,较好的解决了反射波的一致性问题。
The decay of ultrasonic waves by materials is one of the main factors that affect the testing ability of ultrasonic flaw detector. Not only does it make the useful reflected signal submerged in the noise, which makes it difficult to detect the signal, but also makes the reflected waves generated by the defects at different depths inconsistent, resulting in the wrong judgment of the defect. This article uses depth gain compensation (DGC) voltage to solve this problem. The pre-designed DGC voltage curve is stored in the memory. When the flaw detector receives the reflected ultrasonic wave, the DGC voltage is read by addressing the memory, and the gain of the amplifier is controlled after D / A conversion so that the reflection Wave compensation, a better solution to the consistency of the reflected wave.