ACG
Angle-Corrected Gain
ACG – Angle-Corrected Gain is a method of compensating for a reduction in signal amplitude with increases in beam angle when operating a phased array in S-scan mode. The amplitude of a calibration reflector at a specific depth will decrease with increasing beam angle due to the increased beam path within the probe shoe and the calibration block and the transmission across the probe/block interface. ACG allows the system gain to be adjusted so that all beam angles in the S-scan will operate at the same sensitivity relative to the calibration reflector.
Applying ACG and time-corrected gain (TCG) together allows the use of a constant sensitivity within the region of interest.
For an example of the effect of ACG, see:
www.olympus-ims.com/en/ndt-tutorials/calibration/calibrationnormalization
WHAT THE HEC?! articles are not intended to be the definitive account on the topic or acronym in question. Readers’ comments and contributions are welcomed. Email: ndtnews@bindt.org
Applying ACG and time-corrected gain (TCG) together allows the use of a constant sensitivity within the region of interest.
For an example of the effect of ACG, see:
www.olympus-ims.com/en/ndt-tutorials/calibration/calibrationnormalization
WHAT THE HEC?! articles are not intended to be the definitive account on the topic or acronym in question. Readers’ comments and contributions are welcomed. Email: ndtnews@bindt.org
