Measurement set-ups and means of data acquisition Sample Clauses

Measurement set-ups and means of data acquisition. The inspection procedure is selected according to the sample geometry, accessibility, types of defects and their positions. In all cases, inspection is performed using phased arrays. According to the samples defined in previous chapter, several inspection set-ups can be distinguished: direct contact, angle beam, TRL and TOFD. Using the direct contact set-up, the array is positioned directly on the surface of the sample, without wedge. Such set-up is suitable both for SDH and FBH detection that are located sufficiently deep inside the sample. Close to surface SDH’s and notches can be detected with angle beam set-ups, using a wedge between the phased array and the mock-up. TRL techniques uses special TRL wedges and pitch-catch technique that allow to improve the signal-to-noise ratio in the coarse grained samples. Such technique is mostly suitable for detection of SDH. The angle of the wedge, frequency of the transducer, number of array elements and position of the array on the mock-up are selected individually for each case by the user, according to their owned equipment, grain structure and defects under inspection. The Tables 6.6–6.9 summarizes recommended set-ups separately for each of the investigated mock-up and targeted defect. Each set-up has its own data acquisition method, which is either the full matrix capture (FMC) or plane wave excitation (PWE). The user can select one of the recommended set-ups or to define its own set-up if necessary. In any case the order defined in Tables 6.6–6.9 must be maintained. Each set-up leads to a single dataset file, which will be processed by reference and newly developed/modified methods during the project. The datasets will be converted into MFMC format and distributed among project partners for individual processing and analysis. Table 6.6: Measurement set-ups and data acquisition techniques for mock-up 1618-B359-B1 1618-B359-B1 Phased array configuration Unique set-up no. Targeted defects Direct contact (without Angle beam (with TRL probe Frequency, f Data acquisition method Dataset file name wedge) wedge) #01 FBH1–2 + – – 2–5 MHz FMC* #02 + – – PWE** #03 + – – FMC #04 SDH10–70 + – – 2–5 MHz PWE #05 – + – FMC #06 – – + FMC #ID*** * – FMC is full matrix capture; ** – PWE refers to plane wave excitation; *** – Unique set-up defined by the user. Table 6.7: Measurement set-ups and data acquisition techniques for mock-up D522-TG D522-TG Unique set- up no. Targeted defects Phased array configuration Data acquisition...
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