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20 November 2009 Monitor system of cable tension with fiber Bragg grating
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Measuring cable-stayed bridge's cable tension in real time is very worthiness in construction control, cable replacing and bridge's health monitoring. A novel distributed cable tension fiber Bragg grating vibrate measuring system is designed in this paper. Utilizing the relationship between tension and frequency to measure the cable tension indirectly based on theory of string vibration. Double fiber Bragg grating micro accelerometer is designed to improve measuring sensitivity and resolution. Using continues wave tunable frequency technique to demodulate the distributed grating vibrating measuring system and applying the system in tensional stress control when build the bridge. The experiment results and theory indicate that the monitoring system has a simple structure with good stability, linear response capacity, and wide measurable range of the cable tension. It is can satisfy the needs for long term monitoring of cable-stayed bridge, as well as provide continuous and accurate information.
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Zhaoxia Wu, Aijuan Song, Tiegen Liu, and Zhiquan Li "Monitor system of cable tension with fiber Bragg grating", Proc. SPIE 7511, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 75111N (20 November 2009);

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