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Proceedings Paper

A new optical fiber sensor with improved strain sensitivity based on distributed optical fiber sensing technique
Author(s): Sheng Shen; Zhisheng Wu; Caiqian Yang; Yongsheng Tang; Gang Wu; Wan Hong
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Paper Abstract

In general, macro-strain is an effective index for health monitoring of civil infrastructures, which can reveal the unforeseen damage accumulation. However, it is difficult to acquire precise strain distribution with existing fully-distributed optical fiber sensing techniques. Based on the distributed optical fiber strain sensing technique of pulse-prepump Brillouin Optical Time Domain Analysis (PPP-BOTDA), a new optical fiber sensor with improved strain sensitivity (OFSISS) is proposed to enhance the precision of macro-strain measurements. The most advantage of the OFSISS sensor is that it can markedly reduce the measurement error of strain data with a proper designed magnified coefficient. The OFSISS has also good designability and durability according to detailed sensing requirements. Results of uniaxial tensile experiment show not only the high accuracy and precision of the OFSISS but also an important fact that the measured magnified coefficients of the manufactured OFSISSs with a recoating process agree well with the designed values. The bending experiment of using a steel beam illustrates that the linearity and reliability of macro-strain measurement from the OFSISS are good enough for the application in actual macro-strain monitoring and structural deformation monitoring.

Paper Details

Date Published: 9 April 2009
PDF: 12 pages
Proc. SPIE 7293, Smart Sensor Phenomena, Technology, Networks, and Systems 2009, 729315 (9 April 2009); doi: 10.1117/12.815768
Show Author Affiliations
Sheng Shen, Southeast Univ. (China)
Zhisheng Wu, Southeast Univ. (China)
Ibaraki Univ. (China)
Caiqian Yang, Southeast Univ. (China)
Yongsheng Tang, Southeast Univ. (China)
Gang Wu, Southeast Univ. (China)
Wan Hong, Southeast Univ. (China)

Published in SPIE Proceedings Vol. 7293:
Smart Sensor Phenomena, Technology, Networks, and Systems 2009
Norbert G. Meyendorf; Kara J. Peters; Wolfgang Ecke, Editor(s)

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