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Proceedings Paper

Stress monitoring of tensioned bars with fiber optic sensor
Author(s): K. S. Lau; K. H. Wong; Tommy H.T. Chan; S. K. Yeung
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Paper Abstract

An interferometric fiber optic sensor is used to monitor the vibration of a bar under tension. An analytical formula is derived to relate the density. Young modulus and the physical dimensions of the bar to its frequency of vibration, which is measured through FFT of the monitored signal from the fiber optic sensor. Bars made up of homogeneous materials are tested for the validity of the method, which is then applied to composite materials. In the latter application, an optical fiber, which form an integral part of the sensor, can be embedded into the bar during its fabrication process. For materials of stable moduli, the sensor can be used to measure the tension of the bar. For materials with unstable moduli, during its curing process, the aging period or otherwise, the sensor can be used to monitor the change. The method can also be used as an alternative to measure the moduli of materials and is especially suitable for composite materials. Due to the complexity of a composite material, the modulus measured by this method reflects an average effect of the bulk, whereas a conventional tensile test depends more on localized weaknesses of the composite.

Paper Details

Date Published: 20 March 1997
PDF: 5 pages
Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); doi: 10.1117/12.269820
Show Author Affiliations
K. S. Lau, Hong Kong Polytechnic Univ. (Hong Kong)
K. H. Wong, Hong Kong Polytechnic Univ. (Hong Kong)
Tommy H.T. Chan, Hong Kong Polytechnic Univ. (Hong Kong)
S. K. Yeung, Hong Kong Polytechnic Univ. (Hong Kong)


Published in SPIE Proceedings Vol. 2921:
International Conference on Experimental Mechanics: Advances and Applications
Fook Siong Chau; C. T. Lim, Editor(s)

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