What does "DAC" stand for in ultrasonic testing?

The term "DAC" in ultrasonic testing stands for Distance Amplitude Correction. This concept is crucial in ultrasonic testing as it addresses the variations in signal amplitude caused by factors such as distance, beam spread, and attenuation as the ultrasonic wave travels through the material.

Distance Amplitude Correction allows technicians to standardize the amplitude of the echo return signals to ensure accurate assessments of the material being tested, regardless of the distance between the transducer and the reflective surface or flaw. This correction is essential for making reliable evaluations of flaws, as it compensates for the natural decay of sound waves over distance.

Understanding DAC is fundamental for quality control and assurance in various industries where ultrasonic testing is applied, such as aerospace, manufacturing, and structural evaluation.