A novel time-division multiplexing fiber Bragg grating sensor interrogator for structural health monitoring |
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| Authors: | Yongbo Dai Yanju Liu Jinsong Leng Gang Deng Anand Asundi |
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| Affiliation: | 1. Department of Automatic Test and Control, No. 92 West DaZhi Street, Harbin Institute of Technology (HIT), Harbin 150001, PR China;2. Department of Aerospace Science and Mechanics, No. 92 West DaZhi Street, Harbin Institute of Technology (HIT), Harbin 150001, PR China;3. Centre for Composite Materials, No. 2 YiKuang Street, Science Park of Harbin Institute of Technology, P.O. Box 3011, Harbin 150080, PR China;4. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore |
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| Abstract: | A novel fiber Bragg grating (FBG) sensor system for measurement of strain and temperature is proposed in this paper. The proposed sensor technique is based on time-division multiplexing (TDM). A semiconductor optical amplifier (SOA), connected in a ring cavity, is used to serve as a gain medium and switch. The SOA is driven by a pulse generator, which operates the SOA at different periods of time to select reflected pulses from a particular sensor. The FBG sensors have identical center wavelengths and can be deployed along the same fiber. This technique relieves the spectral bandwidth issue and permits the interrogation of up to 100 FBGs along a fiber, if the reflectivity of the individual sensors is sufficiently low to avoid shadowing effects. This system is particularly suitable for the application in structural health monitoring (SHM) where large numbers of sensors are required in wide measurement ranges. |
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