Distance amplitude correction (DAC) provides a means of establishing a graphic ‘reference level sensitivity’ as a function of sweep distance on the A-scan display. The use of DAC allows signals reflected from similar discontinuities to be evaluated where signal attenuation as a function of depth has been correlated.

DAC曲线是逐点绘制的曲线，通常选取3处以上不同声程距离的相同反射体的回波来绘制。 利用DAC所绘制的曲线，探伤时候能直接读出缺陷回波高度比曲线所代表的规则反射体的当量高多少dB（如Ф3长横孔+5dB），同时还可以在已绘制的曲线（如Ф3长横孔）基础上，增益或者衰减一定的dB数来自动生成多条曲线（如Ф3-10 dB, Ф3-14dB），多条曲线构成多个区域（如评定区、定量区、判废区），方便判断缺陷高度在哪一区域而做出评判。 所以DAC曲线适合按照某一规则 …

2016年9月20日 · DGS (Distance-Gain-Size) is probe-specific as a means of setting sensitivity from a series of either the same dıameter flat-bottomed holes (FBH) at different soundpath distances OR using different diameter flat-bottomed holes at the same soundpath. Its an equivalent area defect sizing method,

dac曲线 的定义和作用. dac定义：dac是一条距离-波幅曲线，同一当量的缺陷随着深度的增大，受信号的衰减、声束的扩散及其他因素的影响，其回波幅度呈指数下降趋势，把不同深度的同一当量的人工缺陷的反射回波幅度连成一条曲线，这条曲线就是dac曲线；

DAC stands for Distance Amplitude Correction Curve in Ultrasonic Testing. Where do we use DAC? DAC is used for evaluating the equivalent flaw size in Ultrasonic Testing. What does it mean by Equivalent Flaw Size (EFS) in Ultrasonic testing?

A Distance Amplitude Correction (DAC) curve is used to plot the variation in amplitude between reflectors of the same size at varying distances from the transducer. Such reflectors produce echoes whose amplitude in the far field typically decreases with distance, due to attenuation and beam spreading as the sound beam travels through the test ...

Distance amplitude correction (DAC) provides a means of establishing a graphic reference level sensitivity as a function of sweep distance on the A-scan display. The use of DAC allows signals reflected from similar discontinuities to be evaluated where signal attenuation as a function of depth has been correlated.

2023年2月11日 · The distance amplitude correction (DAC) curve is a graph that shows the relationship between the amplitude of an ultrasonic echo and the distance it has traveled through the material being tested. This curve is used to correct for the attenuation that occurs as the ultrasonic wave travels through the material.

2015年12月24日 · Focus on UT data diagnosis, while the software helps with the rest. NDTkit UT offers an outstandi...

DAC – Distance Amplitude Curve is a basic step in Ultrasonic Testing (UT) calibration before scanning the job piece. In this video, everything explained prac...