Naslov
Possibilities of Reliable Ultrasonic Detection of Subwavelength Pipework Cracks

Autori
Hrabar, Ivan ; Petošić, Antonio ; Franček, Petar ; Budimir, Marko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 12th International Conference of the Croatian Nuclear Society / Vrbanić, Ivan ; Šadek, Siniša ; Bašić, Ivica - Zagreb : Hrvatsko nuklearno društvo, 2018, 118-1

ISBN
978-953-48100-1-9

Skup
12th International Conference of the Croatian Nuclear Society

Mjesto i datum
Zadar, Hrvatska, 03.07.2018. - 06.07.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
ultrasonic testing, NDT, subwavelength, transducer self-impedance

Sažetak
An occurrence of cracks in pipework could lead to potentially very dangerous malfunction in some critical engineering systems such as power plants. There is a clear trend of replacing traditional manual testing with non-invasive in- situ methods that should detect crack formation in its early stage. Such as approach would enable replacing of unhealthy pipe components during the regular periodic outages. Ultrasonic testing is known to be a rather mature and reliable technology. However, it suffers from serious problems in detection of the cracks of subwavelength size. This paper attempts to soften aforementioned problems by investigating the influence of a duration of the unipolar excitation signal on the achieved resolution. In addition, the transducer input electrical impedance of NDT transmitter was measured by using different excitation pulses and their levels and the results are compared with those obtained using traditional frequency sweeping method at low excitation levels. Finally, use of some advanced signal processing algorithms that might lead to the automatic detection of subwavelength voids, in scenarios with low signal-to-noise ratio, is discussed.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Elektrotehnika

POVEZANOST RADA