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The Distance Amplitude Correction (DAC) curve technique specified by the ASME Code is used to adjust ultrasonic testing signals for the loss of signal amplitude with increasing distance from the transducer. This technique accounts for the attenuation of sound waves as they travel through the material being inspected, allowing for more accurate flaw detection and sizing. Implementing DAC curves improves the reliability and consistency of ultrasonic inspections by compensating for signal degradation over different material thicknesses and distances.

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What is distance amplitude correction?

Distance amplitude correction is a technique used in geophysics to adjust seismic data for the effects of attenuation, which causes signal amplitude to decrease as the distance from the source increases. By applying correction factors to compensate for this loss of amplitude, the seismic data can be more accurately interpreted and better reflect the true subsurface properties.


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The distance from rest to crest is called amplitude, while the distance from rest to trough is also called amplitude. The amplitude represents the maximum displacement of a wave from its rest position.


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