A new optical fiber sensor with improved strain sensitivity based on distributed optical fiber sensing technique

Sheng Shen; Zhisheng Wu; Caiqian Yang; Yongsheng Tang; Gang Wu; Wan Hong

doi:10.1117/12.815768

9 April 2009 A new optical fiber sensor with improved strain sensitivity based on distributed optical fiber sensing technique

Sheng Shen, Zhisheng Wu, Caiqian Yang, Yongsheng Tang, Gang Wu, Wan Hong

Author Affiliations +

Proceedings Volume 7293, Smart Sensor Phenomena, Technology, Networks, and Systems 2009; 729315 (2009) https://doi.org/10.1117/12.815768
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

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.

Citation Download Citation

Sheng Shen, Zhisheng Wu, Caiqian Yang, Yongsheng Tang, Gang Wu, and Wan Hong "A new optical fiber sensor with improved strain sensitivity based on distributed optical fiber sensing technique", Proc. SPIE 7293, Smart Sensor Phenomena, Technology, Networks, and Systems 2009, 729315 (9 April 2009); https://doi.org/10.1117/12.815768

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