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Towards an Alternative to Time of Flight Diffraction Using Instantaneous Phase Coherence Imaging for Characterization of Crack-Like Defects
- Source :
- Sensors, Volume 21, Issue 3, Sensors, Vol 21, Iss 730, p 730 (2021), Sensors (Basel, Switzerland)
- Publication Year :
- 2021
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2021.
-
Abstract
- Time of flight diffraction (TOFD) is considered a reliable non-destructive testing method for the inspection of welds using a pair of single-element probes. On the other hand, ultrasonic phased array imaging has been continuously developed over the last couple of decades, and now features powerful algorithms, such as the total focusing method (TFM) and its multi-view approach to rendering detailed images of inspected parts. This article focuses on a different implementation of the TFM algorithm, relying on the coherent summation of the instantaneous signal phase. This approach presents a wide range of benefits, such as removing the need for calibration, and is highly sensitive to defect tips. This study compares the sizing and localization capabilities of the proposed method with the well-known TOFD. Both instantaneous phase algorithm and TOFD do not take advantage of the signal amplitude. Experimental tests were performed on a &frac34<br />&Prime<br />thick steel sample with crack-like defects at different angles. Phase-based imaging techniques showed similar characterization capabilities as the standard TOFD method. However, the proposed method adds the benefit of generating an easy-to-interpret image that can help in localizing the defect. These results pave the way for a new characterization approach, especially in the field of automated ultrasonic testing (AUT).
- Subjects :
- ultrasonic imaging
Computer science
Phased array
Acoustics
lcsh:Chemical technology
01 natural sciences
Biochemistry
Signal
Instantaneous phase
Article
Analytical Chemistry
Rendering (computer graphics)
Time-of-flight diffraction ultrasonics
0103 physical sciences
TFM
lcsh:TP1-1185
Electrical and Electronic Engineering
010301 acoustics
Instrumentation
010302 applied physics
instantaneous phase
Ultrasonic testing
Atomic and Molecular Physics, and Optics
Amplitude
ultrasonic phased array
Ultrasonic sensor
TOFD
Coherence (physics)
Subjects
Details
- Language :
- English
- ISSN :
- 14248220
- Database :
- OpenAIRE
- Journal :
- Sensors
- Accession number :
- edsair.doi.dedup.....170b8758d9ae889bee07fba1bbd444e7
- Full Text :
- https://doi.org/10.3390/s21030730