DAC - Distance Amplitude Correction
DAC is a way of correcting for the fact that when the distance between the reflector and the ultrasonic probe increases, the reflector's pulse-echo response decreases.
Because the transmitted ultrasonic beam spreads out as it travels from the probe to the reflector, the lower the energy of the sound that actually impacts the reflector the further the reflector is from the probe. Similarly, the lower the energy received back at the probe, the longer the reflected pulse has to travel.
For More Learning, Standards available
BS EN ISO 16811:2014 Non-destructive testing – Ultrasonic testing – Sensitivity and range setting.
DGS - Distance/Gain/Size
DGS is a sizing method that compares the amplitude of a reflector's echo to the amplitude of a flat bottom hold at the same depth or distance. This is known as Equivalent Reflector Size or ERS.
