A novel time-division multiplexing fiber Bragg grating sensor interrogator for structural health monitoring

作者：Dai Yongbo; Liu Yanju; Leng Jinsong^*; Deng Gang; Asundi Anand

来源：Optics and Lasers in Engineering, 2009, 47(10): 1028-1033.

DOI：10.1016/j.optlaseng.2009.05.012

• Fiber Bragg grating sensor
• Wavelength-division multiplexing
• Time-division multiplexing
• Structural health monitoring

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.

• 出版日期2009-10
• 单位南阳理工学院; 哈尔滨工业大学