A simplified Approach for DAC with Phased-Array

摘要

Sizing with phased-array techniques and DAC method is very time consuming in the preparation phase, because one has to record a DAC curve for every refraction angle to be realized. The use of a new UT probe technology (trueDGS) now allows to calculate mathematically DAC-curves for all angles. Thus, it is sufficient to record echoes for just one refraction angle as a reference. Furthermore, sound attenuation can be derived from these recorded echoes. After recording one single DAC-curve, curves for all other angles are calculated, while taking different probe parameters for every angle, such as delay line and near-field length and gain difference, into account. With this approach the complexity of flaw sizing with phased-array technology using the DAC-method can be almost reduced to the complexity seen with conventional, single element probes; the set-up time for the DAC-method can be significantly shortened.