Noise analysis of digital ultrasonic system and elimination of pulse noise |
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| Affiliation: | 1. School of Mechanical Engineering, Xi''an Jiaotong University, People''s Republic of China;2. School of Material Science and Engineering, Beijing Polytechnic University, Beijing 100022, People''s Republic of China;1. Pathology Unit, S.Orsola-Malpighi University Hospital, Bologna, Italy;2. General and Transplant Surgery Unit, S.Orsola-Malpighi University Hospital, Bologna, Italy;3. Regional Transplant Center, S.Orsola-Malpighi University Hospital, Bologna, Italy;1. Institute of Intelligent Industrial Technologies and Systems for Advanced Manufacturing, National Research Council of Italy, via Amendola 122 D/O, Bari, Italy;2. Department of Mechanics, Mathematics and Management, Politecnico di Bari, viale Japigia 182, Bari, Italy;1. Department of Medicine, University of California at San Diego, George Palade Labs, Room 232, La Jolla, CA 92093-0651, USA;2. Department of Cellular and Molecular Medicine, University of California at San Diego, La Jolla, CA 92093-0651, USA;3. Moores Cancer Center, University of California, San Diego, La Jolla, CA, USA |
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| Abstract: | In the evaluation of a welded joint using a digital ultrasonic system, it is found that it is noise that constitutes the main difficulty in the detection of weak ultrasonic signals. In this work a physical model of a digital ultrasonic system is established and applied to analyze noises encountered in ultrasonic testing. An algorithm of extremum filtering is constructed to suppress the pulse noise. Experiment verifies that the algorithm is simple and efficient, and not only can it eliminate the pulse noise substantially, but it also retains the other components of the signal unchanged. |
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