Laser Ultrasonic Inspection of Graphite Epoxy Laminates

Padioleau, C.; Bouchard, Paul; Héon, R.; Monchalin, Jean‐Pierre; Chang, F.H.; Drake, T. E.; McRae, K. I.

doi:10.1007/978-1-4615-2848-7_172

Cited by 12 publications

(4 citation statements)

References 4 publications

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“…Such systems have typically been used in scanning applications for the examination of carbon fibre composites. Artificial laminate defects have been examined where the defects were buried in samples of thickness ranging from 1 mm to 20 mm [10][11][12][13]. In some of our own measurements, defect sizes were typically 6 mm × 6 mm or 3 mm × 3 mm.…”

Section: Introductionmentioning

confidence: 99%

New field formulas for the Fabry - Pérot interferometer and their application to ultrasound detection

Shan¹,

Bradford²,

Dewhurst³

1998

Meas. Sci. Technol.

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Inaccurate field formulas for light transmitted through Fabry - Pérot interferometers have been identified in the open literature. A phase lag between the first emerging ray with respect to the incident ray is generally omitted. Such an error is not important when only one type of emerging ray is investigated. However, when more than one type of ray is monitored simultaneously, such as in the application of the confocal Fabry - Pérot interferometer to the detection of ultrasound, the error leads to an inconsistency between modelling and experimental measurement. This paper presents corrected field formulas for plane and confocal interferometers, and goes on to describe ultrasound transfer functions for a confocal interferometer. These functions are shown to give good agreement with independent experimental measurements. Finally, a variety of confocal inteferometer configurations for ultrasound detection are presented, together with an outline of their essential features including their detection limits.

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Section: Introductionmentioning

confidence: 99%

New field formulas for the Fabry - Pérot interferometer and their application to ultrasound detection

Shan¹,

Bradford²,

Dewhurst³

1998

Meas. Sci. Technol.

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“…The prototype was built to explore and assess the applicability oflaser-ultrasonics to several types of materials under different conditions. With this system, we recently explored the applicability of the technique to the inspection of different types of composite components [3][4][5]. The laboratory investigations have led to very promising results, which confirmed the potential of the technique.…”

Section: Introductionmentioning

confidence: 94%

Laser-Ultrasonic Inspection of the Composite Structure of an Aircraft in a Maintenance Hangar

Choquet¹,

Héon²,

Padioleau³

et al. 1995

Review of Progress in Quantitative Nondestructive Evaluation

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“…The development of this application has been actively pursued for many years by IMI/NRC, UltraOptec, Inc. a licensee of IMI/NRC and General Dynamics of Forth Worth, Texas (now Lockheed Martin Aeronautics Company) [52,64,65]. Lockheed-Martin has at one point continued independently its own development, which has led to systems that are now routinely used for testing composite parts of the F-22 fighter fabricated by the company [66,67].…”

Section: Inspection Of Aircraft Structures Made Of Polymer-matrix Commentioning

confidence: 99%

Laser-Ultrasonics: From the Laboratory to Industry

Monchalin¹

2004

AIP Conference Proceedings

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A broad overview of the field of laser-ultrasonics is presented. This overview draws from developments at the Industrial Materials Institute of the National Research Council of Canada as well as elsewhere. The principles of generation and detection are presented, stressing a few key characteristics of laser-ultrasonics: the material is actually the emitting transducer and transduction is made by light, thus eliminating any contact. These features carry both advantages and limitations that are explained. Another feature, which has been an impediment, is actually the complexity of the "laser-ultrasonic transducer", but in spite of this complexity, it can be made very reliable for use in severe industrial environments. It also can be very cost effective for a number of applications. Three applications that are now used in industry are presented: the inspection of polymer matrix composites used in aerospace, the measurement of thin layers in microelectronics and the thickness gauging of hot steel tubing in production. Technological aspects, such as interferometer design, detection lasers and others are also discussed. As an overall conclusion, laser-ultrasonics that was for a long time a laboratory curiosity has definitely now made its transition to industry. Nevertheless, developments should continue to improve performance, to make it well adapted to specific inspection or characterization tasks and more affordable.

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Laser Ultrasonic Inspection of Graphite Epoxy Laminates

Cited by 12 publications

References 4 publications

New field formulas for the Fabry - Pérot interferometer and their application to ultrasound detection

New field formulas for the Fabry - Pérot interferometer and their application to ultrasound detection

Laser-Ultrasonic Inspection of the Composite Structure of an Aircraft in a Maintenance Hangar

Laser-Ultrasonics: From the Laboratory to Industry

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