scholarly journals Using the Correlation Function in Ultrasonic Non-destructive Testing

10.14311/348 ◽  
2002 ◽  
Vol 42 (3) ◽  
Author(s):  
M. Kreidl ◽  
P. Houfek
Keyword(s):  
Correlation Function ◽  
Cross Correlation ◽  
Ultrasonic Inspection ◽  
Ultrasonic Signal ◽  
Cross Correlation Function ◽  
Statistical Dependence ◽  
Measured Signal ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

This paper deals with ultrasonic signal de-noising by means of correlation. It is commonly known that the cross-correlation function shows the statistical dependence between two signals. In ultrasonic inspection, the measured signal is taken as the first signal. The most important aspect of this method is the choice of the second signal. Various types of the second signals can be tried.

scholarly journals Chirplet Transform in Ultrasonic Non-Destructive Testing and Structural Health Monitoring: A Review

2019 ◽  
Vol 9 (1) ◽  
pp. 3778-3781
Author(s):  
M. S. Mohammed ◽  
K. Ki-Seong
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Ultrasonic Signal ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Structural Health ◽  
Chirplet Transform ◽  
Testing Signal ◽  
Short Time ◽  
Non Destructive

Ultrasonic non-destructive testing signal can be decomposed into a set of chirplet signals, which makes the chirplet transform a fitting ultrasonic signal analysis and processing method. Moreover, compared to wavelet transform, short-time Fourier transform and Gabor transform, chirplet transform is a comprehensive signal approximation method, nevertheless, the former methods gained more popularity in the ultrasonic signal processing research. In this paper, the principles of the chirplet transform are explained with a simplified presentation and the studies that used the transform in ultrasonic non-destructive testing and in structural health monitoring are reviewed to expose the existing applications and motivate the research in the potential ones.

Investigation of Interaction of Laser Generated Lamb Waves With Structures of Interest

2011 ◽  
Author(s):  
Lei Yang ◽  
I. Charles Ume
Keyword(s):  
Lamb Waves ◽  
Test Procedure ◽  
Ultrasonic Inspection ◽  
Wave Number ◽  
Laser Generation ◽  
Great Promise ◽  
Non Destructive Testing ◽  
Electromagnetic Acoustic Transducer ◽  
Destructive Testing ◽  
Non Destructive

Laser generation/EMAT (electromagnetic acoustic transducer) reception ultrasonic inspection technique shows a great promise in the field of Non-Destructive Testing of welds due to its non-contact nature. However, the broadband nature of laser generation and the dispersive characteristic of Lamb waves make the laser generated ultrasonic signals in thin structures extremely complicated. In order to ease the interpretation of received signals, it is desirable to investigate the interactions of different structural features with Lamb waves and find their related signatures in signal, which offers the potential to detect different types of weld defects using a single test procedure. This work proposed a technique based on 2-D Fourier Transformation to investigate the laser generated Lamb waves experimentally and to find the most sensitive predictors in EMAT received signals corresponding to a specific structural feature of interest. The amplitudes of different Lamb wave modes in the wave-number/frequency domain provide a wealth of information. The demonstration of the technique was carried out on aluminum plates with isolated rectangular notches of different depths. The procedure introduced here is general which can be employed in other applications of Non-Destructive Testing.

Ultrasonic B-Scan of Adhesive Bonded Thin Aluminum Sheet

2017 ◽  
Vol 268 ◽  
pp. 407-412
Author(s):  
Azim Fikri Mhd Subre ◽  
Md Supar Rohani
Keyword(s):  
Sound Wave ◽  
Ultrasonic Inspection ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Bonded Materials ◽  
Testing Method ◽  
Thin Aluminum ◽  
Pass Through ◽  
The Waves ◽  
Non Destructive

Ultrasonic inspection using b-scan (brightness scan) and its application for discontinuity and flaws detection were investigated. Brightness scan is one of the ultrasonic technique’s branches, it provides thorough image of the material which undergone inspection via density of the material where then depicted in different colour in conjunction with the acoustic impedance of the phase gone through by the sound wave. The sound wave generated with a piezoelectric transducer was propagated through aluminum wafer samples and were identified by the b-scan system. Its ability to detect flaw at certain depth which was introduced manually been examined. Experimental results show different brightness characteristic, depending on the adhesive treatments, type of material and medium when the waves pass through in each sample. Brightness scan system was proven to be reliable non-destructive testing method in ultrasonic for inspection of structural bonded materials.

Non-Destructive Testing with Ultrasound in Rails and Ship Plates

2014 ◽  
Vol 605 ◽  
pp. 613-616
Author(s):  
Panagiotis I. Chatzifotis
Keyword(s):  
Ultrasonic Inspection ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Ultrasound Technique ◽  
Straight Beam ◽  
Pulse Echo ◽  
Thickness Measurements ◽  
Non Destructive ◽  
Pulse Echo Method

This paper deals with finding of defects, such as cracks, breakdowns and inclusions in rails and in ship plates, by ultrasound technique. Pulse echo method and twin beams technique is some of the ultrasonic inspection methods we have used for thickness measurements and for inspection of the welds. Initially, the thickness of rails and ship plates was measured by ultrasound devices using straight beam transducers and then the weldings of these samples were checked by using angle beam transducers.

scholarly journals Assessment of Aluminum FSW Joints Using Ultrasonic Testing

2017 ◽  
Vol 62 (4) ◽  
pp. 2399-2404 ◽  
Author(s):  
K. Adamus ◽  
P. Lacki
Keyword(s):  
Friction Stir Welding ◽  
Ultrasonic Testing ◽  
Ultrasonic Inspection ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Friction Stir ◽  
Joining Technology ◽  
Structural Metals ◽  
Material Discontinuities ◽  
Non Destructive

AbstractThe paper concerns aluminum joints made using friction stir welding. Although in the aerospace industry there is a tendency to replace metal components with composites, aluminum continues to be a valuable material. Its share in the aircraft structures is the biggest among all structural metals. Lots of aluminum components are made of sheets and most of them require joining. Friction stir welding is a relatively new joining technology, particularly with regard to the sheets having a thickness of 1 mm or lower. The paper is dedicated to non-destructive testing of such joints using ultrasonic inspection. It was found that ultrasonic testing allows for distinguishing between joints without material discontinuities, joint with material discontinuities at the advancing side and joint with discontinuities extending through the whole width of the stir zone. During research only horizontally aligned defects were taken into account.

Application of Intelligent AutoCAD in Ultrasonic Inspection of the Welds

2011 ◽  
Vol 130-134 ◽  
pp. 2421-2424
Author(s):  
Guo Qiang Cao ◽  
Lan Yao ◽  
Yi Tong Dai
Keyword(s):  
Ultrasonic Inspection ◽  
Flaw Detection ◽  
Practical Experience ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Factors Affecting ◽  
Ultrasonic Flaw ◽  
Weld Inspection ◽  
Non Destructive

Ultrasonic flaw detection in weld inspection is commonly used in non-destructive testing methods. But when the ultrasonic inspection of the welds, point location of defects and identify need technical personnel calculation and according to their long-term practical experience, it requirement for inspection personnel has higher technology.And in ultrasonic weld inspection there will be some factors affecting the accuracy of positioning. It will lead to limitations of ultrasonic weld inspection. To solve these problems effectively, AutoCAD will be used in ultrasonic weld inspection.

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