Flat bottom hole distance amplitude curve

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Selecting a Reference Standard. In figure 15a, a side-drilled hole is shown in a test block that can be scanned with four different scanning patterns. This site uses cookies to enhance performance, analyze traffic, and for ads measurement purposes. In the screen at right, a different reflector at a depth of approximately 26 mm has been gated. From that one calibration point, an entire curve set can be drawn based on probe and material characteristics. Ultrasonic Flaw Detection Tutorial. The most accurate way to assess these defects is to repeat the DAC curve generation with a series of diameter holes.

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In all cases, reference standards must be prepared and used in strict accordance with well designed specifications that cover the material, the fabrication and the application of the blocks.

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FYI: Reference and Calibration Standards

Selection of a reference standard is determined by testing technique, type of material to be inspected and form,type of discontinuity to be detected, and specification requirements. DGS is a sizing technique that relates the amplitude of the echo from a reflector to that of a flat bottom hold at the same depth or distance. Figures 15a and 15b conceptually illustrate how a DAC curve would be generated for an angle beam transducer. This technique consists of generating a DAC curve that essentially indicates that a smaller echo at a greater distance may have similar properties to a larger echo at a lesser distance. The advantage of such a reference standard is that the test object and the standard will have the same composition,manufacturing history, surface condition and geometry. Regardless of the technique used to generate a DAC curve, the material used in the calibration block should be the same as the material in the test specimen due to potential differences in attenuation characteristics.

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flat bottom hole distance amplitude curve
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