Non-destructive testing of aerospace composite materials using digital shearography

Abstract

Digital shearography, a laser interferometry technique in conjunction with the digital imaging processing, has the potential for identifying defects both in small- and large-scale structures. This paper will focus on the recent development of digital shearography for non-destructive testing (NDT). With the improvement of the measuring methods and the development of a small and mobile measuring device in conjunction with a user-guided program, Shearwin, this laser inspection technique can be used easily in the environment of fieldwork. A few examples show its application in the aerospace industry for NDT of composites, e.g. GLARE panel, honeycomb structure and glass (or carbon)-fibre-reinforced plastics, etc.

Keywords

digital shearography non-destructive testing composite materials strain measurement

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References

Hung

Y Y

Recent development in practical optical nondestructive testing. In

Proceedings of the International Society for Optical Engineering, 1991, SPIE Vol. 1554B, pp. 29–45.

Yang

L X

Steinchen

Kupfer

Digital Shearografie für die direkte Messung der Biege-und Scherdehnungen von dünnen Platten

Forsch. im Ingenieurwesen—Engng Res., 1996, 62 (6), 168–174.

Creath

Phase-shifting speckle interferometry

Appl. Optics, 1985, 24 (18), 3053–3058.

Yang

L X

Steinchen

Schuth

Kupfer

Noch präziser zerstörungsfrei Prüfen—Anwendung der Phasenschiebetechnik in der elektronischen Shearografie

Technica, 1995, 11, 19–22.

Yang

L X

Grundlagen und Anwendungen der Phasenschiebe-Shearografie zur zerstörungsfreien Werkstoffprüfung, Deh-nungsmessung und Schwingungsanalyse. PhD thesis, University of Kassel, Germany, 1997;

Fundamentals and Applications of the Phase Shifting Shearography to Non-destructive Material Testing, Strain Measurement and Vibration Analysis (in German), (No. 682, 1998 (VDI Verlag, Düsseldorf).

Owner-Petersen

Decorrelation and fringe visibility: On the limiting behavior of various electronic speckle-pattern correlation interferometers

J. Opt. Soc. Am., 1991, 8, 1082–1089.

Steinchen

Yang

L X

Kupfer

Vibration Analysis by Digital Shearography, SPIE Vol. 2868, 1996, pp. 426–437.

Toh

S L

Shang

H M

Chau

F S

Tay

C J

Flaw detection in composites using time-average shearography

Optics Laser Technol., 1991, 23 (1), 25–30.

Steinchen

Yang

L X

Kupfer

Mäckel

Thiemich

Vibration Analysis by Digital Speckle Pattern Shearing Interferometry, SPIE Vol. 3098, 1997, pp. 158–165.