The experimental study of fatigue crack detection using scanning laser point source technique

Ni, Chao; Dong, Liming; Shen, Zhonghua; Lü, Jian

doi:10.1016/j.optlastec.2011.04.003

Cited by 26 publications

(12 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can also perform online testing depending on its high signal-processing speed. SAW generated by laser has been successfully used for detecting different types of cracks (internal cracks, surface cracks, fatigue cracks, and so on) [18,22,23] in metals and nonmetal materials [21]. In recent years, the LU technique has been used for evaluating ultrasound velocity and elastic properties of human teeth.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Scanning laser-line source technique for nondestructive evaluation of cracks in human teeth

et al. 2014

Self Cite

View full text Add to dashboard Cite

This paper describes the first application of a remote nondestructive laser ultrasonic (LU) system for clinical diagnosis of cracks in human teeth, to our knowledge. It performs non-contact cracks detection on small-dimension teeth samples. Two extracted teeth with different types of cracks (cracked tooth and craze lines), which have different crack depths, are used as experimental samples. A series of ultrasonic waves were generated by a scanning laser-line source technique and detected with a laser-Doppler vibrometer on the two samples. The B-scan images and peak-to-peak amplitude variation curves of surface acoustic waves were obtained for evaluating the cracks' position and depth. The simulation results calculated by finite element method were combined with the experimental results for accurately measuring the depth of crack. The results demonstrate that this LU system has been successfully applied on crack evaluation of human teeth. And as a remote, nondestructive technique, it has great potential for early in vivo diagnosis of cracked tooth and even the future clinical dental tests.

show abstract

Section: Introductionmentioning

confidence: 99%

“…In order to improve the crack detection capability in human teeth, an experimental system was built based on a scanning laser line source (SLLS) technique [21,22]. A series of SAW signals nondestructively generated by the scanning laser were detected on a cracked tooth and teeth with craze lines.…”

Section: Introductionmentioning

confidence: 99%

Scanning laser-line source technique for nondestructive evaluation of cracks in human teeth

et al. 2014

Self Cite

View full text Add to dashboard Cite

show abstract

“…For many years, laser-ultrasonic technology has been increasingly used for nondestructive crack detections [7][8][9][10]. The biggest advantage of this technology is noncontact without regard to external forces and surface conditions of materials.…”

Section: Introductionmentioning

confidence: 99%

Crack Detection in Single-Crystalline Silicon Wafer Using Laser Generated Lamb Wave

Song

Jhang

2013

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

In the semiconductor industry, with increasing requirements for high performance, high capacity, high reliability, and compact components, the crack has been one of the most critical issues in accordance with the growing requirement of the wafer-thinning in recent years. Previous researchers presented the crack detection on the silicon wafers with the air-coupled ultrasonic method successfully. However, the high impedance mismatching will be the problem in the industrial field. In this paper, in order to detect the crack, we propose a laser generated Lamb wave method which is not only noncontact, but also reliable for the measurement. The laser-ultrasonic generator and the laser-interferometer are used as a transmitter and a receiver, respectively. We firstly verified the identification of S0 and A0 lamb wave modes and then conducted the crack detection under the thermoelastic regime. The experimental results showed that S0 and A0 modes of lamb wave were clearly generated and detected, and in the case of the crack detection, the estimated crack size by 6 dB drop method was almost equal to the actual crack size. So, the proposed method is expected to make it possible to detect the crack in the silicon wafer in the industrial fields.

show abstract

“…Scanning method that can inspect large composite structures is also needed. Other researchers used laser pulses focused into line or point source for ultrasound generation and a laser interferometer for wave detection. On the basis of their system configurations, the results were presented as A‐scan or B‐scan images.…”

Section: Introductionmentioning

confidence: 99%

“… studied the broadband Lamb wave propagation and dispersion characteristics in various materials, whereas Ni et al . studied the interaction of Rayleigh wave and fatigue crack in a metallic sample. The feasibility of building a noncontact version of UPI system using air‐coupled transducer and laser Doppler vibrometer was also proven in .…”

Section: Introductionmentioning

confidence: 99%

Composite aircraft debonding visualization by laser ultrasonic scanning excitation and integrated piezoelectric sensing

Chia

Jeong

Lee

et al. 2012

Struct. Control Health Monit.

View full text Add to dashboard Cite

SUMMARY Two aircraft wings made of carbon fiber‐reinforced plastic material were inspected using the laser‐based ultrasonic propagation imaging system for the visualization of manufacturing defect and damages of debonding mode. Hypotheses of the detection mechanism of composite debonding were presented and validated through the inspection results for the bonding lines of the composite wing structures. The inspection showed that the location, shape, and size of the poor bonding defect, artificial stringer tip debonding, and real skin–spar debonding can be visualized and/or measured from the imaging results. The performance of the imaging system was found better than that of a manual ultrasonic C‐scan in terms of spatial resolution and damage detectability. Another finding from the inspection was the occurrence of skin buckling between two riveted locations. Most importantly, the presence of structural elements or features such as spars, stringers, ribs, lugs, inspection windows, and even embedded PZT elements did not adversely affect the inspection. Copyright © 2012 John Wiley & Sons, Ltd.

show abstract

The experimental study of fatigue crack detection using scanning laser point source technique

Cited by 26 publications

References 13 publications

Scanning laser-line source technique for nondestructive evaluation of cracks in human teeth

Scanning laser-line source technique for nondestructive evaluation of cracks in human teeth

Crack Detection in Single-Crystalline Silicon Wafer Using Laser Generated Lamb Wave

Composite aircraft debonding visualization by laser ultrasonic scanning excitation and integrated piezoelectric sensing

Contact Info

Product

Resources

About