Conference: Publication Date: 24 October 2016Testing Method:
When chart recordings are generated during ultrasonic testing, it is possible to extract some information about the inspection process directly from the chart recording, even with limited additional documentation. This paper concerns itself mainly with digital chart recordings, though some application to paper charts is possible. In many cases, the following information can be determined from certain analyses of the chart recording: The number of times a calibration reflector was detected during a single pass The pulse repetition rate The running speed of the material with respect to the transducer A relationship between the sound beam length and the scanning index An estimate of the location of indications, apart from any measurements made by the technician A measurement of the wall thickness total indicator reading (TIR), when thickness measurement is performed This paper will present the techniques and mathematics required to determine each of these characteristics.
Trach, P., “Digital Chart Recording of Immersion Ultrasonic Testing”, paper presented at the ASNT Fall Conference, Palm Springs, CA, 2011.
Shannon, C., “Communication in the Presence of Noise,” Proceedings of the IRE, Volume 37, no. 1, 1949.
Beck, K., “Invariant Worst-Case Interception of Indications during Nondestructive Testing Scanning”, Materials Evaluation, Volume 66, No. 2, 200
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