The different echoes represent the responses from the side-drilled holes in a calibration block, and we can see a regular sensitivity distribution.įor this TFM frame, the pixel size is one-tenth of a wavelength and the amplitude fidelity is less than 0.5 dB-well under the threshold according to Mandatory Appendix XI. This curve is like the A-scan signal of a virtual 0-degree probe in each horizontal position of the TFM frame. We can see the TFM frame on the left side of the image and the amplitude depth curve on the right. Influence of amplitude fidelity on TFM image qualityĪs an example, let’s look at a high-resolution TFM frame, 512 by 512 pixels, generated with 64 probe elements. The user interface also automatically shows the calculated value of the amplitude fidelity.
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On the instrument screen, the depth and width of the individual pixels is shown in wavelength units. The onboard UltraVision Touch software for Zetec’s TOPAZ family of integrated phased-array instruments includes a TFM Calculator that helps the operator select an adequate and code-compliant frame resolution. The amplitude fidelity for a given inspection configuration depends on the probe frequency and wave mode, the material velocity and the resolution of the TFM frame. The amplitude fidelity represents the maximum possible amplitude error for a TFM frame according to the Nyquist or sampling theorem, a principle that engineers follow in the digitization of analog signals. In addition to setting calibration standards and other rules for code compliance, Appendix XI requires a signal amplitude fidelity threshold of 2 dB.
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The new Mandatory Appendix XI in the latest edition of the ASME Boiler & Pressure Vessel Code (BPVC) Section V outlines requirements for the use of Full Matrix Capture (FMC), raising the profile of FMC and advanced algorithms like the Total Focusing Method (TFM). They can improve the resolution of flaw images and increase the coverage of ultrasonic inspections.
![transformice codes transformice codes](https://i.ytimg.com/vi/rye7pu4qcNI/maxresdefault.jpg)
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