DAKOTA ULTRASONICS DFX-7 Operation Manual
Also see for DFX-7: Operation manualManual
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Contents
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72CHAPTER TENDISTANCE, GAIN, SIZE (DGS)10.1 Introduction to DGS (AVG)The DGS (Distance, Gain, Size) method was introduced in 1958 as a way tostandardize the process of evaluating and sizing defects, also referred to by theGerman acronym AVG. This method uses a combined empirical and mathematicalmodel to eliminate the need for a large range of reference standards, generallyrequired when using the DAC or TCG methods. DGS can be thought of as amathematically derived DAC curve, and used as an alternative replacement for DAC.The concept of the DGS method is to compare the amplitude/gain of similar reflectorsat different distances and sizes, to mathematically approximate the size of the defectusing the effective probe diameter, frequency and near field length (NFL). Thereference to ‘similar reflectors’ assumes that the orientation of the reflector is thesame for all sizes, which is unrealistic to assume during actual field testing. Thediagram below illustrates the mathematically derived set of curves used for DGS: |
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