Detection of cracks in aluminum beams using fiber optic polarimetric sensor

Jianjun Ma; Anand Krishna Asundi

doi:10.1117/12.369372

11 November 1999 Detection of cracks in aluminum beams using fiber optic polarimetric sensor

Jianjun Ma, Anand Krishna Asundi

Proceedings Volume 3897, Advanced Photonic Sensors and Applications; (1999) https://doi.org/10.1117/12.369372
Event: International Symposium on Photonics and Applications, 1999, Singapore, Singapore

Abstract

On-line monitoring cracks development of the aircrafts in active service is of great significance for flight safety. Fiber optic sensor has its unique advantages over conventional sensors in this aspect. For modern aircrafts, many critical structures are made of aluminum alloys. When structural damage occurs in structures due to cracking, it reduces the stiffness. This charge is reflected in the structure through changes in its dynamic characteristics such as natural frequencies, modal damping. In this paper, the ability of surface mounted fiber optic polarimetric sensor on aluminum vibrating cantilever specimen to detect cracks is studied. Different sources such as He-Ne laser, LD for fiber communication, laser pointer with longer, shorter and very short interference lengths are used in our experiments to evalute their ability for dynamic test, respectively. The preliminary experimental results show that the measured main frequencies will be different for various number of cracks and depths. The three sources, the drift of light intensity and the change of interference contrast will not affect the measured main frequency values. Some of theoretical analysis is also given. From these results, surface mounted fiber optic polarimetric sensors is expected to find its application in monitoring structural integrity of structural members of aircraft in active service.

Citation Download Citation

Jianjun Ma and Anand Krishna Asundi "Detection of cracks in aluminum beams using fiber optic polarimetric sensor", Proc. SPIE 3897, Advanced Photonic Sensors and Applications, (11 November 1999); https://doi.org/10.1117/12.369372

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KEYWORDS

Fiber optics sensors

Sensors

Polarimetry

Aluminum

Fiber optics

Birefringence

Fiber lasers

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