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NDT.net Issue - 2019-03 - Articles
NDT.net Issue: 2019-03
Publication: 10th International Symposium on NDT in Aerospace, Oct 2018, Dresden, Germany (AeroNDT 2018)
Session: Applications
ARTICLE

The Use of Pulse Compression Technique in Non-Destructive Testing: A Review

Muhammad Khalid Rizwan12, Hamed Malekmohammadi23, Stefano Laureti14, Pietro Burrascano24, David A. Hutchins39, Gui Yun Tian429, Junzhen ZHU44, Qiuji Yi44, Marco Ricci27
1Dept. of Engineering; University of Perugia ,Terni11, Terni, Italy
2Dept. of Engineering; University of Perugia, Perugia, Italy
3Warwick Manufacturing Group (WMG); University of Warwick52, Coventry, United Kingdom
4University of Newcastle31, Newcastle upon Tyne, United Kingdom

Abstract: Non-Destructive Testing (NDT) refers to an extended group of techniques used both in research and industry, which are exploited for inspecting, characterizing and evaluating various kinds of materials and goods. Eddy Current Testing (ECT), Ultrasonic Testing (UT) and InfraRed Thermography (IRT) are among the most employed NDT methods. In the said methods, a short duration delta-like signal provided by different types of transducers is typically employed to excite the sample under test (SUT) within an extended bandwidth. Features of interest, e.g. presence of flaws and inclusions inside the SUT, can be extracted by analyzing the system’s impulse response both in time and frequency domains. However, the maximum achievable Signal-to-Noise Ratio (SNR) is directly related to the source power. This limit can be overcome by using coded excitations together with Pulse Compression (PuC) technique. In fact, in PuC the frequency spectrum of the coded excitation can be tailored to suit the investigation of a given sample, while the SNR can be increased almost arbitrarily by enhancing the signal time duration. Finally, the system’s impulse response is retrieved by applying the PuC algorithm on the acquired data. In this paper, the use of PuC technique in IRT [1-4], UT [5,6], ECT [7-9] will be reviewed and discussed.


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